Glass coated product

Abstract

To provide a glass-coated product easy to produce and having excellent corrosion resistance.SOLUTION: A glass-coated product with a glass layer (GL) baked onto a surface of a metal product, wherein the metal product comprises a base portion (BP) consisting of iron-based metal and a high corrosion-resistant portion (HP) consisting of high corrosion-resistant metal with at least one of the nickel and chromium content being higher than that of the iron-based metal, the surface of the metal product having a base surface (SB) that is the surface of the base portion (BP) and a high corrosion surface (SH) that is the surface of the high corrosion-resistant portion (HP), and when viewed from the thickness direction of the glass layer (GL) at the edge of the glass layer (GL), the high corrosion surface (SH) is provided to extend from the edge of the metal product, and the edge of the glass layer (GL) is positioned above the high corrosion surface (SH), thereby providing a glass-coated product.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a glass-coated product in which a glass layer is baked onto the surface of a metal product. [Background technology]

[0002] Conventionally, glass-coated products, such as enamel products, in which a glass layer is baked onto the surface of metal products, have been widely used. Among enamel products, glass-lined products are widely used as components of facilities where chemical processes are carried out. Glass-lined products are required to have excellent corrosion resistance due to their applications. In addition, general-purpose enamel products other than glass-lined products (hereinafter also referred to as "general-purpose enamel products") used in building materials such as bathtubs and wall panels and cooking utensils such as pots and kettles are also required to have excellent corrosion resistance because corrosion of the underlying metal product can cause the glass layer to peel off or cause a deterioration in aesthetics due to rust.

[0003] In a glass-coated product, the surface of the metal product usually has an exposed surface that is not covered with a glass layer and is exposed to the surface of the glass-coated product, and a glass-coated surface that is covered with a glass layer. That is, in a glass-coated product, the edge of the glass layer defines the boundary between the exposed surface of the metal product and the glass-coated surface.

[0004] In this type of glass-coated product, if the metal product is made of a metal with excellent corrosion resistance, the glass-coated product will also exhibit excellent corrosion resistance. In this regard, for example, it is known that the corrosion resistance of iron-based metals can be improved by adding a large amount of chromium. Nickel-based alloys are also known to have better corrosion resistance than general iron-based metals. However, these highly corrosion-resistant metals with excellent corrosion resistance may be more expensive or less workable than general iron-based metals. Therefore, as shown in Patent Document 1 below, in conventional glass-coated products, only the part where the edge of the glass layer, which is likely to be the starting point of peeling of the glass layer, is located is made of a highly corrosion-resistant metal. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2-125729 Summary of the Invention [Problem to be solved by the invention]

[0006] When manufacturing a glass-coated product, a glazing process is performed in which a slurry containing glass powder is poured or sprayed to produce an unfired product in which an unfired glass layer is laminated on the surface of a metal product, and a firing process is performed in which the unfired product is fired in a furnace. Here, if a part of the metal product is made of a highly corrosion-resistant metal and a part of the surface of the metal product is made to be a highly corrosion-resistant surface, it becomes difficult to distinguish between the highly corrosion-resistant surface and the other surface, and it becomes difficult to determine the range of glazing. Therefore, in conventional glass-coated products, it is difficult to achieve both excellent corrosion resistance and ease of manufacture. Therefore, the present invention aims to solve such problems and to provide a glass-coated product that is easy to manufacture and has excellent corrosion resistance. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides: A glass-coated product in which a glass layer is baked onto the surface of a metal product, The metal product comprises a base portion made of an iron-based metal, and a highly corrosion-resistant portion made of a highly corrosion-resistant metal having a higher content of at least one of nickel and chromium than the iron-based metal, The surface of the metal product is provided with a base surface which is a surface of the base portion, and a highly corrosion-resistant surface which is a surface of the highly corrosion-resistant portion, When the edge portion of the glass layer is viewed from the thickness direction of the glass layer, the highly corrosion resistant surface is provided to extend from an edge of the metal product; a glass coated product having an edge of the glass layer positioned on the highly corrosion resistant surface. Effect of the Invention

[0008] The present invention provides a glass-coated product that is easy to manufacture and has excellent corrosion resistance. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing an example of a reaction vessel made of a glass-lined product. [Diagram 2] FIG. 2 is a schematic diagram showing a cover member which is a glass-lined product. [Figure 3a] FIG. 3a is a schematic perspective view showing a metal ring that serves as the base of the protection ring. [Figure 3b] FIG. 3b is a schematic diagram showing a method for manufacturing a metal ring that serves as the base of the protection ring. [Figure 3c] FIG. 3c is a schematic diagram showing a manufacturing method of the metal ring that serves as the base of the protection ring. [Figure 3d] FIG. 3d is a schematic diagram showing a method for manufacturing a metal ring that serves as the base of the protection ring. [Figure 3e] FIG. 3e is a schematic diagram showing a manufacturing method of the metal ring that serves as the base of the protection ring. [Figure 3f] FIG. 3f is a schematic diagram showing a method for manufacturing a metal ring that serves as the base of the protection ring. [Figure 4a] FIG. 4a is a schematic plan view showing a metal ring that serves as the base of the protection ring. [Figure 4b] FIG. 4b is a schematic plan view showing the protection ring. [Diagram 5] FIG. 5 is a schematic cross-sectional view showing the cross-section of the protection ring. [Figure 6] FIG. 6 is a schematic cross-sectional view showing the cross-section of another protection ring. [Figure 7]FIG. 7 is a schematic cross-sectional view showing the cross-section of another protection ring. [Figure 8] FIG. 8 is a schematic cross-sectional view showing the cross-section of another protection ring. [Figure 9] FIG. 9 is a schematic cross-sectional view showing the cross-section of the container nozzle. [Figure 10] FIG. 10 is a schematic cross-sectional view showing the cross-section of another container nozzle. [Figure 11] FIG. 11 is a schematic cross-sectional view showing the cross-section of another container nozzle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to specific glass-lined products. However, the glass-coated product of the present invention may be a glass-lined product other than those exemplified below, or may be a general-purpose enamel product other than a glass-lined product, or may be other than those.

[0011] The following describes a reaction tank as an embodiment of the present invention. The reaction tank 1 illustrated in the figure is a vertical tank. The reaction tank 1 has a tank body 10 with a storage space 10c for storing reactants. The tank body 10 has an opening at the top for communicating the storage space 10c with the space outside the tank. The reaction tank 1 of this embodiment further has a cover member 20 that closes the opening of the tank body 10. The tank body 10 and the cover member 20 are each a glass-lined product. That is, the reaction tank 1 illustrated in FIG. 1 is composed of multiple glass-lined products.

[0012] 1 and 2, in this embodiment, a metal product (metal vat 100) that is machined to have a shape corresponding to the vat body 10 serves as the base of the vat body 10. The vat body 10 is composed of the metal vat 100 and a glass layer GL that is baked onto the metal vat 100. The lid member 20 also has a metal product (metal lid material 200) as its base, and is equipped with the metal lid material 200 and a glass layer GL that is baked onto the metal lid material 200.

[0013] The metal vat 100 includes a metal vat body 1100 which becomes the main body portion 110 of the vat body 10 , and a metal nozzle 1200 which constitutes the container nozzle 120 of the vat body 10 .

[0014] The metal tank body 1100 has a body portion 1110 extending in a cylindrical shape in the vertical direction. The body portion 1110 in this embodiment is cylindrical. The metal tank body 1100 is arranged so that the central axis 1110c of the cylindrical body portion 1110 extends in the vertical direction, and the central axis 1110c extends in the vertical direction. The metal tank body 1100 includes a bottom portion 1120 that closes the cylindrical body portion 1110 from the lower end side, and a ceiling portion 1130 that closes the body portion 1110 from the upper end side. The bottom portion 1120 in this embodiment is a disk shape with a portion close to the central axis 1110c bulging downward, and the ceiling portion 1130 is a disk shape with a portion close to the central axis 1110c bulging upward.

[0015] In the tank body 10, a glass layer GL is baked onto the inner peripheral surface of the trunk portion 1110, the upper surface of the bottom portion 1120, and the lower surface of the ceiling portion 1130, so that metal products are not exposed to the storage space 10c.

[0016] The ceiling portion 1130 has one or more openings penetrating in the vertical direction. The metal vat 100 further includes the metal nozzle 1200, which is thinner than the body portion 1110 and extends in a cylindrical shape. As shown in FIG. 2, the metal nozzle 1200 includes a cylindrical portion 1210 that extends in a cylindrical shape upward from the opening of the ceiling portion 1130, and a flange portion 1220 that extends radially outward from the upper end of the cylindrical portion 1210. In this embodiment, the cylindrical portion 1210 is cylindrical, and the flange portion 1220 is annular. In the main body portion 110 of the vat body 10, a glass layer GL is baked on the inner circumferential surface of the cylindrical portion 1210 and the upper surface of the flange portion 1220. The glass layer GL in these portions is continuous with the glass layer GL in the ceiling portion 1130.

[0017] In this embodiment, the glass layer GL is not baked onto the lower surface of the flange portion 1220. That is, the metal vat 100 of this embodiment has a plate-shaped portion having an annular shape, the plate-shaped portion having a first surface 1220a, a second surface 1220b opposite to the first surface 1220a, and a side surface 1220c connecting the edges of the second surface 1220b and the first surface 1220a, and the glass layer GL is baked onto only the first surface 1220a of the plate-shaped portion.

[0018] As described above, the tank body 10, which is a glass-lined product, has a main body portion 110 having a shape corresponding to the metal tank body 1100, and the main body portion 110 has a trunk portion 111 that extends cylindrically in the vertical direction.

[0019] The central axis of the main body 110 coincides with the central axis 1110c of the trunk 1110 of the metal vat 100. That is, the main body 110 is arranged so that the central axis extends in the vertical direction. The main body 110 includes a bottom 112 that closes the cylindrical trunk 111 from the lower end side, and a ceiling 113 that closes the trunk 111 from the upper end side. The bottom 112 of this embodiment is also a disk shape that bulges downward, and the ceiling 113 is also a disk shape that bulges upward like the ceiling 1130 of the metal vat main body 1100.

[0020] The tank body 10 is provided with a container nozzle 120 having a shape corresponding to the metal nozzle 1200. The tank body 10 further includes a container nozzle 120 having an opening penetrating the ceiling portion 113 in the vertical direction and extending cylindrically from the opening. The container nozzle 120 includes a cylindrical portion 121 that is thinner than the body portion 111 and extends cylindrically upward from the opening of the ceiling portion 113, and an annular plate-shaped flange portion 122 that extends radially outward from the upper end of the cylindrical portion 121, with the inside of the flange portion 122 being the upper end opening.

[0021] The cover member 20, which constitutes the reaction tank 1 together with the tank body 10, is also a glass-lined product as described above. As shown in Fig. 2, the cover member 20 includes a circular plate-shaped protection ring 210 that overlaps the flange portion 122 of the vessel nozzle 120, and a cover body 220 that is shaped to overlap the protection ring 210 with its periphery aligned.

[0022] The metal lid material 200, which is a metal product constituting the lid member 20, includes a metal ring 2100 having a shape corresponding to the protection ring 210, and a metal lid 2200 having a shape corresponding to the lid main body 220. In this embodiment, the metal lid 2200 and the metal ring 2100 are joined by a hinge at one location on the outer periphery.

[0023] The annular metal ring 2100 constituting the protection ring 210 has an upper surface (first surface 2100a) facing the metal cover 2200, and a lower surface (second surface 2100b) opposite the upper surface and facing the flange portion 122 of the tank body 10. The metal ring 2100 has side surfaces (2100c1, 2100c2) connecting the edge of the first surface 2100a and the edge of the second surface 2100b. The metal ring 2100 has an outer peripheral side surface 2100c2 connecting the radially outer edge of the first surface 2100a and the radially outer edge of the second surface 2100b, and an inner peripheral side surface 2100c1 connecting the radially inner edge of the first surface 2100a and the radially inner edge of the second surface 2100b.

[0024] The gold lid 2200 has a dome-shaped base portion 2210 with a portion closer to the center than the outer periphery bulging upward. The base portion 2210 is doughnut-shaped with an opening in the center that serves as a viewing window. The gold lid 2200 has a gold lid tubular portion 2220 that extends in a cylindrical shape from the opening of the base portion 2210, and a gold lid flange portion 2230 that extends outward from the upper edge of the gold lid tubular portion 2220.

[0025] In the lid member 20, a glass layer GL is baked onto the first surface 2100a, the second surface 2100b, and the inner side surface 2100c1 of the metal ring 2100, as well as the lower surface of the substrate portion 2210 of the gold lid 2200, the inner surface of the gold lid cylindrical portion 2220, and the upper surface of the gold lid flange portion 2230.

[0026] The lid body 220, which is based on the metal lid 2200 as described above, has a dome-shaped base portion 221 with a portion closer to the center than the outer periphery bulging upward. The base portion 221 of the lid body 220 is a doughnut plate-shaped portion with an opening serving as a viewing window in the center. The lid body 220 has a lid tubular portion 222 extending from the opening of the base portion 221 in a cylindrical shape, a lid flange portion 223 extending outward from the upper end edge of the lid tubular portion 222, a glass plate 224 abutting against the lid flange portion 223 so as to close the upper opening of the lid tubular portion 222, and an annular window frame portion 225 for sandwiching the glass plate 224 between the lid flange portion 223 and the lid flange portion 223, and the inside of the window frame portion 225 is a glass window 220w for observing the state of the storage space 10c from the outside.

[0027] The flange portion 122 of the container nozzle 120 and the protection ring 210 are laminated via a circular plate-shaped gasket S1 that is thinner than the protection ring 210 and the flange portion 122. A thin circular plate-shaped gasket S2 is also interposed between the protection ring 210 and the lid main body 220. A circular plate-shaped gasket S3 is also interposed between the lid flange portion 223 and the glass plate 224, and a circular plate-shaped gasket S4 is also interposed between the glass plate 224 and the window frame portion 225.

[0028] The metal tank 100 and the metal cover material 200 of this embodiment include a base part BP made of an iron-based metal, and a highly corrosion-resistant part HP made of a highly corrosion-resistant metal having a higher content of at least one of nickel and chromium than the iron-based metal. The highly corrosion-resistant part HP in this embodiment is made of a highly corrosion-resistant metal filled in a notch part BP1 provided in the base part BP. More specifically, the highly corrosion-resistant part HP in this embodiment is made of a highly corrosion-resistant metal welded to the base part BP at the notch part BP1.

[0029] The highly corrosion-resistant portion HP is provided so as to be exposed on the surface of the metal vat 100 or the metal lid member 200. Therefore, the surface of the metal vat 100 or the metal lid member 200 includes a base surface SB, which is the surface of the base portion BP, and a highly corrosion-resistant surface SH, which is the surface of the highly corrosion-resistant portion HP. The glass layer GL of the vat body 10 or the lid member 20 is provided so that the edge portion is located on the highly corrosion-resistant surface SH.

[0030] Glass-coated products such as glass-lined products are manufactured so that compressive stress acts on the glass layer GL. This allows the glass layer GL to exhibit high strength in glass-coated products. However, when the interface corrodes and the bonding strength between the glass layer GL and the metal product weakens, the stress distribution in the glass layer GL changes, causing excessive stress, and the glass layer GL breaks from the point where this stress occurs. The corrosion that causes such cracks progresses from the edge of the glass layer GL. As the corrosion progresses, the glass layer GL breaks into small pieces and peels off from the metal product. The peeling of the glass layer GL, called chipping, also progresses from the edge of the glass layer GL. Therefore, in metal products, the part where the edge of the glass layer GL is located is made of a highly corrosion-resistant metal, which is effective in preventing the progress of chipping.

[0031] Examples of the iron-based metal constituting the base portion BP include carbon steel and stainless steel. Examples of stainless steel include JIS SUS301, SUS301L, SUS301J1, SUS302B, SUS303, SUS304, SUS304Cu, SUS304L, SUS304N1, SUS304N2, SUS304LN, SUS304J1, SUS304J2, SUS305, SUS309S, SUS310S, SUS312L, SUS315J1, SUS315J2, SUS316, SUS316L, SUS316N, SUS316LN, SUS316Ti, SUS316J1, SUS316J1L, SUS317, SUS317L, SUS317LN, SUS317J1, SUS317J2, SUS836L, SUS890L, SUS321, SUS347, SUSXM7, SUSX Examples of the stainless steel include austenitic stainless steel such as M15J1, austenitic-ferritic stainless steel such as SUS329J1, SUS329J3L, and SUS329J4L, ferritic stainless steel such as SUS405, SUS410L, SUS429, SUS430, SUS430LX, SUS430J1L, SUS434, SUS436L, SUS436J1L, SUS443J1, SUS444, SUS445J1, SUS445J2, SUS447J1, and SUSXM27, martensitic stainless steel such as SUS403, SUS410, SUS410S, SUS420J1, SUS420J2, and SUS440A, and precipitation hardening stainless steel such as SUS630 and SUS631. The iron-based metal may be a low-carbon grade (e.g., SUS304L, SUS316L) having a carbon content of 0.030% by mass or less.

[0032] The highly corrosion-resistant metal constituting the highly corrosion-resistant portion HP preferably has a higher total content of nickel and chromium than the iron-based metal, and more preferably has a higher total content of nickel and chromium than the iron-based metal. When SUS304 (18Cr, 8Ni) or SUS304L (18Cr, 9Ni) is used as the iron-based metal, SUS316 (18Cr, 12Ni) or SUS316L (18Cr, 12Ni) may be used as the highly corrosion-resistant metal. The highly corrosion-resistant metal may be, for example, a welding material such as 308N2, 309, 309Si, 309Mo, 309L, 309LD, 309LSi, 309LMo, 309LMoD, 309LNb, 309LNbD, 310, 310S, 310L, 312, 316, 316H, 316Si, 316L, 316LSi, 316LCu, 317, 317L, 318, 318L, 320, 320LR, 329J4L, 330, 383, 385, 2209, etc., as specified in JIS Z3321. The highly corrosion-resistant metal may be a nickel-based alloy known under the trade name of Inconel or Hastelloy. The highly corrosion-resistant metal may be, for example, a corrosion-resistant and heat-resistant superalloy such as NCF600, NCF601, NCF625, NCF690, NCF718, NCF750, NCF751, NCF80A, NCF800, NCF800H, NCF825, NCF020, or NCF354 as specified in JIS G4902; or nickel or nickel-based alloys such as NW2200, NW2201, NW4400, NW4402, NW5500, NW0001, NW0665, NW0276, NW6455, NW6022, NW6210, NW6007, NW6985, or NW6002.Examples of highly corrosion-resistant metals include nickel welding materials such as Ni2061 and Ni2061J specified in JIS Z3334; nickel-copper welding materials such as Ni4060, Ni4061, and Ni5504; nickel-chromium welding materials such as Ni6072, Ni6073, Ni6076, and Ni6082; nickel-chromium-iron welding materials such as Ni6002, Ni6025, Ni6030, Ni6043, Ni6045, Ni6052, Ni6054, Ni6055, Ni6062, Ni6176, Ni6601, Ni6693, Ni6701, Ni6975, Ni6985, Ni7069, Ni7092, Ni7718, Ni8025, Ni8065, and Ni8125; The welds may be nickel-molybdenum welds such as Ni1004, Ni1008, Ni1009, Ni1024, Ni1062, Ni1066, Ni1067, and Ni1069; nickel-chromium-molybdenum welds such as Ni6012, Ni6022, Ni6035, Ni6057, Ni6058, Ni6059, Ni6200, Ni6205, Ni6276, Ni6452, Ni6455, Ni6625, Ni6650, Ni6660, Ni6686, and Ni7725; nickel-chromium-cobalt welds such as Ni6160, Ni6617, Ni7090, and Ni7263; and nickel-chromium-tungsten welds such as Ni6231.

[0033] When the highly corrosion-resistant part HP is formed by welding, it is diluted with an iron-based metal, so that the highly corrosion-resistant part HP after welding may not be made of the above-mentioned materials. Whether the corrosion resistance of the highly corrosion-resistant part HP is higher than that of the base part BP can also be determined by measuring the corrosion potential.

[0034] The base part BP and the highly corrosion-resistant part HP may be joined by a physical joining force such as screwing or shrink fitting, or may be joined by a joining material such as a welding material, or the highly corrosion-resistant metal may be used as a welding material and the welding material may be welded to the base part BP to form the highly corrosion-resistant part HP. In such a case, the welding may be fusion welding such as arc welding, gas welding, or laser welding, pressure welding such as spot welding or seam welding, or may be thermal spraying or brazing.

[0035] From the viewpoint of the robustness of the joint between the base part BP and the highly corrosion resistant part HP, the highly corrosion resistant part HP may be formed by build-up welding a highly corrosion resistant metal to the base part BP. The highly corrosion resistant part HP may be a laminate of multiple layers including a first welded layer in contact with the base part BP and a second welded layer overlapping the first welded layer. The highly corrosion resistant part HP may be welded such that beads formed by build-up welding overlap in three or more layers.

[0036] As mentioned above, the metal products used to manufacture the glass-coated products are: a) a preparation step of forming a primary member from an iron-based metal for forming the base portion BP; b) a welding step of welding a highly corrosion-resistant metal for forming the highly corrosion-resistant portion HP to the primary member to form a secondary member; c) a finishing step of machining the outer shape of the secondary part to give it a desired shape as a metal product.

[0037] In the preparation step, a primary member having a shape corresponding to the shape of the base portion BP can be formed, and a primary member 2100' having a cutout portion BP1' can be formed. In the welding step, the surface defining the cutout portion BP1' is used as the welded surface, and welding can be performed so that the cutout portion BP1' is filled with a highly corrosion-resistant metal. Since distortion or the like may occur in the primary member 2100' due to heat in the welding step, a primary member 2100' having a thickness and length that are slightly larger than those of the metal product when the cutout portion BP1' is filled with the highly corrosion-resistant metal may be used, and the entire surface of the secondary member 2100'' may be machined in the finishing step.

[0038] In the preparation step, for example, a cutting process using a lathe or the like is performed on the original member before the notch is formed, to form the notch BP1', thereby forming the primary member. More specifically, in the preparation step, a metal ring entirely made of an iron-based metal may be prepared, and the corners of the metal ring may be cut off using a lathe or the like to form the notch, thereby producing the primary member. The welding step may be performed by welding a welding material to the welded surface of the primary member, and in this case, the notch BP1' may be filled with the welding material by one welding, or the notch BP1' may be filled with the welding material by multiple welding. When multiple welding steps are performed, the welding may be performed in a direction away from the welded surface. For example, when the cross-sectional shape of the notch BP1' is horizontally elongated, the welding may be performed so that the beads of the welding material are arranged horizontally and multiple beads are stacked in the thickness direction.

[0039] In the welding process, more welding material than necessary may be welded. In the finishing process, distortion caused by welding may be corrected, or the distorted surface may be cut to be flat. In the finishing process, excess welding material may be removed by cutting.

[0040] In the preparation process, for example, taking the protection ring 210 as an example, as shown in Figure 3a, a primary member 2100' is prepared in which a notch BP1' is provided at each corner where the first surface 2100a of the metal ring 2100 intersects with the outer peripheral side surface 2100c2, and at each corner where the second surface 2100b intersects with the outer peripheral side surface 2100c2.

[0041] 3b is provided so as to reach the radially outer edge of the metal ring 2100. On the other hand, this notch BP1' does not reach the radially inner edge of the metal ring 2100. Therefore, the notch BP1' is defined by two surfaces: an annular bottom wall surface W1 that defines the bottom surface of the notch BP1', and a vertical wall surface W2 that rises from the inner peripheral edge of the bottom wall surface W1.

[0042] In this embodiment, the cutout portion BP1' is filled with a highly corrosion-resistant metal by welding. Therefore, in this embodiment, the bottom wall surface W1 and the vertical wall surface W2 are welded surfaces to which the highly corrosion-resistant metal is welded. In other words, the highly corrosion-resistant portion HP formed by filling the cutout portion BP1' with the highly corrosion-resistant metal has a surface that contacts the bottom wall surface W1 and the vertical wall surface W2 and is a joint surface with the base portion BP.

[0043] If the cutout does not reach the edge of the primary member and has a groove shape with vertical wall surfaces on both sides of the cutout, when welding is performed so that multiple beads WB are lined up horizontally on the bottom wall surface, the welding area may become narrow when the beads WB are lined up in order from the corner between the bottom wall surface and the vertical wall surface and reach the vertical wall surface on the opposite side, making it difficult to work. However, in this embodiment, since the cutout reaches the edge, even if the beads WB are welded in order from the vertical wall surface W2 side, it does not become necessary to fill the narrow area with welding material all the way to the end.

[0044] The bottom wall surface W1 is preferably formed so as to be parallel to the first surface 2100a. In other words, the cutout portion BP1' is preferably formed so that the depth from the first surface 2100a to the bottom wall surface W1 is uniform overall.

[0045] The vertical wall surface W2 may be provided so as to be perpendicular to the bottom wall surface W1, but if the corner CN where the vertical wall surface W2 and the bottom wall surface W1 intersect is recessed so as to be pointed, it becomes difficult for the highly corrosion-resistant metal to enter during welding. Therefore, the vertical wall surface W2 may be provided so as to intersect with the bottom wall surface W1 at an obtuse angle. In addition, a C-surface or an R-surface may be provided at the corner CN where the vertical wall surface W2 and the bottom wall surface W1 intersect. When the corner CN is a C-surface, the value of the corner C may be 0.5 mm or more, or may be 1.0 mm or more. When the corner CN is an R-surface, the value of the corner R may be 0.5 mm or more, or may be 1.0 mm or more. When the bottom wall surface W1 and the vertical wall surface W2 are at an obtuse angle, the angle can be, for example, 95 degrees or more. The angle between the bottom wall surface W1 and the vertical wall surface W2 may be 100 degrees or more, or may be 105 degrees or more.

[0046] The angle between the bottom wall surface W1 and the vertical wall surface W2, and the values ​​of the corners C and R can be measured based on the cross-sectional shape when the primary member 2100' is cut on a plane along the chipping progression direction. The chipping progression direction is usually a direction perpendicular to the direction in which the edge of the glass layer GL extends, which is a radially inward direction in the protection ring 210. Therefore, when checking the angle between the bottom wall surface W1 and the vertical wall surface W2 in the protection ring 210, and the state of the corners C and R, measurements can be performed on a cross section of the protection ring 210 cut on a plane including the central axis of the protection ring 210. Note that the cross section in the direction perpendicular to the direction in which the edge GLe of the glass layer GL extends (in the case of a curved edge, the tangent direction (for example, the direction of the arrow D in FIG. 4b)) is a surface along the thickness direction of the glass layer GL, and hereinafter, the cross section is also referred to as a "thickness direction cross section TX" or the like.

[0047] The depth of the cutout portion BP1' observed in the thickness direction cross section TX (depth from the first surface 2100a to the bottom wall surface W1) may be, for example, 0.05 mm or more, 0.1 mm or more, 0.3 mm or more, or 0.5 mm or more. The depth may be, for example, 1.0 mm or more, 1.5 mm or more, 2 mm or more, or 2.5 mm or more. The depth may be, for example, 20 mm or less, 10 mm or less, 8 mm or less, or 5 mm or less. The length from the corner CN where the bottom wall surface W1 and the vertical wall surface W2 intersect (the center point of the C surface or R surface if provided) along the bottom wall surface W1 to the outer peripheral side surface 2100c2 may be 0.8 times or more the depth of the cutout portion BP1'. The length may be 1.0 times or more, 1.2 times or more, 1.5 times or more, or 2.0 times or more of the depth of the cutout portion BP1'. The length may be, for example, 5 mm or more. The length may be 8 mm or more, 10 mm or more, 15 mm or more, or 20 mm or more. The length may be, for example, 30 mm or less, 20 mm or less, or 10 mm or less.

[0048] The highly corrosion-resistant portion HP formed by filling the cutout portion BP1' with the highly corrosion-resistant metal preferably has a cross-sectional shape that is elongated in the thickness direction from the center of the metal ring toward the edge, thereby making it possible to secure a wide highly corrosion-resistant surface SH while saving the amount of the highly corrosion-resistant metal used.

[0049] The notch BP1' on the first surface 2100a side and the notch BP1' on the second surface 2100b side may have the same shape or different shapes in the thickness direction cross section TX. In this embodiment, the shape of the space in the notch BP1' is annular on both the first surface 2100a side and the second surface 2100b side. Therefore, the highly corrosion-resistant portion HP formed in this embodiment is also annular.

[0050] For example, a circular ring plate made of a highly corrosion-resistant metal may be prepared in advance to have a shape corresponding to the cutout portion BP1', and the circular ring plate may be fitted into one or both of the cutout portion BP1' on the first surface 2100a side and the cutout portion BP1' on the second surface 2100b side and fixed by spot welding or shrink fitting to form the metal ring 2100; however, in this embodiment, build-up welding is performed to provide high bonding strength between the highly corrosion-resistant portion HP and the base portion BP.

[0051] As shown in Figures 3c to 3e, build-up welding can be performed, for example, so that the beads WB are continuously formed in the circumferential direction, and can be performed so that the beads WB are arranged side by side on the bottom wall surface W1. Build-up welding can be performed so that the formation height of the beads WB is equal to or greater than the depth of the cutout portion BP1', and the beads WB do not overlap in the vertical direction. Build-up welding can be performed so that the formation height of the beads WB is less than the depth of the cutout portion BP1', and the beads WB are stacked in the vertical direction.

[0052] It is preferable to perform build-up welding so as to form a laminated structure including a first welded layer BL1 composed of one or more beads WB in contact with the bottom wall surface W1 and a second welded layer BL2 composed of one or more beads WB overlapping the first welded layer BL1 so as to be in contact with the first welded layer BL1 from the side opposite to the bottom wall surface W1. It is preferable that each of the first welded layer BL1 and the second welded layer BL2 is formed so that the multiple beads WB are arranged side by side.

[0053] The above-mentioned build-up welding can be performed by overlapping the bead WB so that it is raised higher than the first surface 2100a and the second surface 2100b, as shown in Figure 3e, and so that the bead WB protrudes outward from the outer peripheral side surface 2100c2.

[0054] In build-up welding, even if a bead WB is formed using a welding rod made of a highly corrosion-resistant metal, the bead WB is diluted by iron-based metal in the area that is in direct contact with the primary component 2100' (bottom wall surface W1 and vertical wall surface W2). Therefore, by forming the above-mentioned laminated structure, the second welded layer BL2 can be made to have a higher purity than the first welded layer BL1, and the content of iron-based metal in the second welded layer BL2 can be reduced. Also, in the second welded layer BL2, the bead WB located at the radially innermost position and in contact with the vertical wall surface W2 is diluted by iron-based metal, but by arranging multiple beads WB side by side, it is possible to prevent iron-based metal from being mixed into the radially outer beads WB.

[0055] After the build-up welding, the excess weld material can be removed by cutting or the like to form a secondary component 2100'' as shown in Figure 3f. The secondary component 2100'' may be used as the metal ring 2100 as is and the glass layer GL may be baked thereon, or it may be further processed, such as by chemical conversion treatment, to form the metal ring 2100.

[0056] The protection ring 210 is manufactured by carrying out a glazing process in which a green product with an unfired glass layer is manufactured by, for example, spraying a slurry containing glass powder onto the metal ring 2100, and a firing process in which the green product is fired in a furnace. At this time, since the highly corrosion-resistant surface SH is formed up to the edge of the metal ring 2100, glazing can be easily carried out to position the edge of the glass layer on the highly corrosion-resistant surface SH.

[0057] The metal ring 2100 formed as described above is provided with a base surface SB, which is the surface of the base portion BP, and a highly corrosion-resistant surface SH, which is the surface of the highly corrosion-resistant portion HP. As shown in FIG. 4a, the metal ring 2100 is provided so that the highly corrosion-resistant surface SH reaches the radially outer edge when viewed from the thickness direction of the glass layer GL to be baked. As described above, in the metal ring 2100, although there is a possibility that the highly corrosion-resistant portion HP contains an iron-based metal, the highly corrosion-resistant surface SH is less likely to contain an iron-based metal in the second or subsequent bead WB. In this embodiment, the highly corrosion-resistant surface SH is formed by scraping the second or subsequent bead WB, so that the purity of the highly corrosion-resistant metal in the highly corrosion-resistant surface SH can be increased. In addition, in the inner part of the highly corrosion-resistant surface SH, which is closer to the radial inner side, the iron-based metal mixed in from the vertical wall surface W2 may be present, but in the part closer to the radial outer side, the probability of the iron-based metal being present is greatly reduced.

[0058] Even in cases where the highly corrosion-resistant surface SH and the base surface SB have similar appearances and it is difficult to determine the boundary between the two just by appearance, if the glass layer GL is formed up to a position close to the edge (the radially outer edge) of the metal ring 2100 as shown in Figure 4b, the edge portion of the glass layer GL will be baked onto the highly corrosion-resistant surface SH made of a highly corrosion-resistant metal with a high purity, thereby suppressing the occurrence of chipping.

[0059] In other words, the protection ring 210 in which the glass layer GL is baked onto the first surface 2100a, the second surface 2100b, and the inner peripheral side surface 2100c1 of the metal ring 2100 comprises a base portion BP made of an iron-based metal, and a highly corrosion-resistant portion HP made of a highly corrosion-resistant metal having a higher content of at least one of nickel and chromium than the iron-based metal, and the surface of the metal ring 2100 is provided with a base surface SB which is the surface of the base portion BP, and a highly corrosion-resistant surface SH which is the surface of the highly corrosion-resistant portion HP, and when the edge portion of the glass layer GL is viewed from the thickness direction of the glass layer GL, the highly corrosion-resistant surface SH is provided so as to extend from the edge of the metal ring 2100, and the edge of the glass layer GL is located on the highly corrosion-resistant surface SH.

[0060] As described above, in the protection ring 210 of this embodiment, the end of the glass layer GL, which is likely to be the starting point of chipping, is baked onto the highly corrosion-resistant surface SH, and the highly corrosion-resistant surface SH extends outward from the glass layer GL beyond the edge GLe of the glass layer GL and reaches the edge of the metal ring 2100. The protection ring 210 of this embodiment is configured in this way to suppress the occurrence of chipping. The corner between the first surface 2100a and the outer circumferential side surface 2100c2 may be R-chamfered or C-chamfered. Even in such a case, the range in which the glass layer GL is formed can be easily set using the edge of the metal ring 2100 (the edge on the outer circumferential side surface 2100c2 side of the chamfered portion) as a guide, and it is easy to suppress chipping. If necessary, the glass layer GL may be provided so as to go around the outer circumferential side surface 2100c2 beyond the corner.

[0061] The protection ring 210 illustrated in the figure has two highly corrosion-resistant parts HP, which are separated from each other on the first surface 2100a and the second surface 2100b of the metal ring 2100. In the protection ring 210 illustrated in the figure, the two highly corrosion-resistant parts HP are laminated on the base part BP in the thickness direction cross section TX, and the highly corrosion-resistant parts HP have a joint surface CF with the base part BP, which is the opposite surface to the highly corrosion-resistant surface SH. It is also possible to form the highly corrosion-resistant parts HP to the same thickness as the metal ring 2100 and form the highly corrosion-resistant surfaces SH on the two surfaces, the first surface 2100a and the second surface 2100b, with one highly corrosion-resistant part HP, but by doing as described above, the amount of highly corrosion-resistant metal used can be reduced.

[0062] The glass layer GL provided on the protection ring 210 may be a multilayer structure including an undercoat glass layer GL1 that is in direct contact with the metal ring 2100 and fired onto the metal ring 2100, and an overcoat glass layer GL2 that is in contact with the undercoat glass layer GL1 from the side opposite the metal ring 2100 and fired onto the metal ring 2100 via the undercoat glass layer GL1, as shown in FIG. 5.

[0063] In the protection ring 210 shown in Figure 5, the highly corrosion-resistant portion HP formed by the highly corrosion-resistant metal filled in the cutout portion BP1 of the base portion BP has a horizontally elongated shape at a thickness-wise cross section TX. However, for example, as shown in Figure 6, the cross-sectional shape of the highly corrosion-resistant portion HP may be vertically elongated or may have some other cross-sectional shape.

[0064] In the protection ring 210 shown in Fig. 6, the length of the highly corrosion-resistant portion HP in the radial direction can be shortened, so the amount of highly corrosion-resistant metal used can be reduced, and the labor required for welding and the like can be reduced. On the other hand, if there is a large difference in the thermal expansion coefficient between the highly corrosion-resistant metal and the iron-based metal, residual stress may occur at the boundary between the highly corrosion-resistant portion HP and the base portion BP after the metal ring 2100 is glazed and the glass layer GL is baked. If the highly corrosion-resistant portion is made horizontally long as in the protection ring 210 shown in Fig. 5, it becomes easier to distance the edge GLe of the glass layer GL, where chipping is likely to occur, from the boundary between the highly corrosion-resistant surface SH and the base surface SB, where such stress is likely to occur.

[0065] For the reasons described above, it is preferable that the glass layer GL is formed so that the edge GLe is located at a position that is at least a certain distance T from the boundary line LL between the highly corrosion-resistant surface SH and the base surface SB. The distance L1 from the boundary line LL to the edge GLe of the glass layer GL may be ensured on both sides or only one side of the protection ring 210. Furthermore, when the distance L1 from the boundary line to the edge GLe of the glass layer GL is ensured only on one side, it is not necessary to ensure such distance T around the entire circumference of the protection ring 210.

[0066] Although it is preferable that the edge GLe of the glass layer GL is disposed at a certain distance L1 from the boundary line LL over the entire length, the distance L1 may be provided over a section of, for example, 10% or more of the entire length of the edge. The section over which the distance L1 is provided may be 25% or more, 50% or more, or 75% or more.

[0067] The distance L1 between the edge GLe of the glass layer GL and the boundary line LL can be, for example, 3 mm or more. This distance L1 may be 4 mm or more, 5 mm or more, 6 mm or more, 8 mm or more, or 10 mm or more. The distance L1 between the edge GLe of the glass layer GL and the boundary line LL can be, for example, 20 mm or less. This distance L1 may be 15 mm or less, or 10 mm or less.

[0068] It is also preferable that the depth L2 of the highly corrosion-resistant portion HP at the location where the edge GLe of the glass layer GL is located (the distance from the joint surface CF with the base part BP on the opposite side to the highly corrosion-resistant surface SH to the highly corrosion-resistant surface SH) is at least a certain level. It is preferable that the edge GLe of the glass layer GL is provided at a location where the highly corrosion-resistant portion HP has a depth L2 of at least a certain level over its entire length, but the location where the edge GLe is provided at such a depth L2 may be, for example, a section of at least 10% of the entire length of the edge GLe. The section where the edge GLe is provided at a location where the highly corrosion-resistant portion HP has a depth of at least a certain level may be at least 25%, at least 50%, or at least 75% of the entire length of the edge GLe.

[0069] The depth L2 of the highly corrosion-resistant portion HP at the position where the edge GLe of the glass layer GL is provided may be, for example, 0.05 mm or more, 0.1 mm or more, 0.3 mm or more, or 0.5 mm or more. This depth L2 may be 1.0 mm or more, 1.5 mm or more, 2 mm or more, 2.5 mm or more, 3 mm or more, or 4 mm or more. The depth L2 of the highly corrosion-resistant portion HP at the position where the edge GLe of the glass layer GL is provided may be, for example, 20 mm or less. This depth L2 may be 10 mm or less, 8 mm or less, or 5 mm or less.

[0070] The highly corrosion-resistant surface SH may have an area ratio of, for example, 25% or more, where the area has the depth L2 as described above. The area ratio of the highly corrosion-resistant surface SH that is occupied by the region having the depth L2 as described above may be 30% or more, 40% or more, 50% or more, or 60% or more. It is preferable that the highly corrosion-resistant surface SH does not have a sudden change in depth within a narrow range. It is preferable that the highly corrosion-resistant portion HP has a constant thickness, or that even if the thickness varies depending on the location, the change in thickness in the planar direction is constant.

[0071] The highly corrosion-resistant portion HP preferably has a plate-like region HPa having a horizontally elongated band shape in a thickness direction cross section TX, or a variable thickness region HPn in which the thickness observed in the thickness direction cross section TX changes at a constant rate in a direction perpendicular to the thickness direction. The glass layer GL is preferably baked so that its edge is located in the plate-like region HPa or the variable thickness region HPn.

[0072] As described above, the highly corrosion-resistant part HP in this embodiment is annular plate-shaped. That is, the plate-shaped region HPa extends in the circumferential direction of the protection ring 210, and the horizontally elongated cross-sectional shape is continuous not only in a cross section by one plane, but also in the depth direction (circumferential direction) of the cross section. In this embodiment, the cross-sectional shapes in all planes including the central axis of the protection ring 210 are horizontally elongated band-shaped. The plate-shaped region HPa in this embodiment may be formed so that the exact same cross-sectional shape continues in the extending direction, or may be formed so that the thickness direction dimension, width direction dimension, etc. of the cross-sectional shape change in the depth direction (circumferential direction) while maintaining the cross-sectional shape as a horizontally elongated band. In glass-coated products other than the protection ring 210 illustrated in the figure, the plate-shaped region may be, for example, a polygonal frame plate shape (square frame plate shape, hexagonal frame plate shape).

[0073] In this embodiment, not only the plate-like region HPa but also the variable thickness region HPn extends in the circumferential direction of the protection ring 210. The variable thickness region HPn may be formed so that the same cross-sectional shape continues in the extending direction, or may be formed so that the thickness dimension, width dimension, degree of change, etc. of the cross-sectional shape change in the depth direction (circumferential direction) while maintaining a state in which the thickness changes at a constant rate in the radial direction.

[0074] In order to suppress chipping, the metal product may be formed so that most of the glass-coated surface is the highly corrosion-resistant surface SH, but it is not necessary to provide the highly corrosion-resistant portion HP over an excessively wide area. For example, the highly corrosion-resistant portion HP and the plate-shaped region HPa may be provided in a disk shape or a polygonal plate shape, but in order to suppress the amount of highly corrosion-resistant metal used and to reduce the labor required for welding and the like, they may be provided so as to extend in a strip shape along the edge of the glass layer GL. In this case, the region whose cross-sectional shape in a plane perpendicular to the extending direction of the plate-shaped region HPa is a horizontally elongated strip shape continues over the extending section of the plate-shaped region HPa, so that chipping can be suppressed from progressing in a direction intersecting with the extending direction of the plate-shaped region HPa. In addition, the variable thickness region HPn can also suppress chipping from progressing in a direction intersecting with the extending direction of the variable thickness region HPn. The plate-shaped region HPa and the variable thickness region HPn do not necessarily need to be provided over the entire section of the extending section of the edge of the glass layer GL, and may be provided only in a part of the section. The plate-like region HPa and the variable thickness region HPn may be provided so as to occupy 50% or more, 70% or more, or 90% or more of the length of the edge portion of the glass layer GL. The plate-like region HPa and the variable thickness region HPn are preferably provided over the entire section (100%) of the edge portion of the glass layer GL.

[0075] From the viewpoint of workability, it is preferable that the thickness change rate in the variable thickness region HPn is set so that the angle (θ in FIG. 11) between the interface with the base part BP and the highly corrosion-resistant surface SH is 45 degrees or less. The angle may be 30 degrees or less, or 20 degrees or less.

[0076] When the highly corrosion-resistant part HP is laminated on the base part BP, the presence of a plate-like region HPa in the highly corrosion-resistant part HP can be confirmed by the boundary line (cross-sectional shape of the joint surface CF) between the highly corrosion-resistant part HP and the base part BP in the thickness direction cross section TX being a straight line parallel to the highly corrosion-resistant surface SH. The presence of a variable thickness region HPn in the highly corrosion-resistant part HP can be confirmed by the boundary line between the highly corrosion-resistant part HP and the base part BP in the thickness direction cross section TX being a straight line at an angle to the highly corrosion-resistant surface SH.

[0077] The straightness of the boundary line can be confirmed by checking that the straightness of the boundary line is within 1 mm. The straightness of the boundary line is preferably within 0.5 mm, more preferably within 0.1 mm, and even more preferably within 0.01 mm. Here, the straightness is set to a value equal to or less than the depth L2 of the highly corrosion-resistant portion. In the protection ring 210 illustrated in FIG. 5, there are two cross sections of the highly corrosion-resistant portion HP, separated on the first surface 210a side and the second surface 210b side. In addition, although not shown in FIG. 5, when the protection ring 210 is cut on a plane including the central axis, there is a cross section of the protection ring 210 cut at a position 180 degrees away from that in FIG. 5, and the two cross sections are arranged so as to be line-symmetrical with respect to the central axis. In addition, in a cross section other than that in FIG. 5, there are two cross sections of the highly corrosion-resistant portion HP, on the first surface 210a side and the second surface 210b side. That is, when the protection ring 210 is cut on a plane including the central axis, cross sections of the highly corrosion resistant portion HP are provided at four locations. The straightness may be the same for each of the four cross sections, or the straightness in one cross section may be different from the straightness in the other cross sections. That is, just as it is not necessary to strictly maintain the cross-sectional shape in the direction in which the plate-like region HPa and the variable thickness region HPn extend as described above, the straightness of the boundary line may also change in the depth direction (circumferential direction) of the cross section.

[0078] The plate-shaped region HPa and the variable thickness region may be formed so that the length in the thickness direction cross section TX is 5 mm or more. The length in the thickness direction cross section TX of the plate-shaped region HPa and the variable thickness region may be 7 mm or more, or may be 10 mm or more. It is preferable that the protection ring 210 is provided with a plate-shaped region HPa and a variable thickness region having a certain or more length in the circumferential direction (depth direction from the thickness direction cross section TX). That is, it is preferable that the highly corrosion-resistant part HP is provided so that the same cross-sectional shape continues in the circumferential direction. The length in the circumferential direction of the plate-shaped region HPa and the variable thickness region may be 10% or more, 25% or more, 50% or more, or 75% or more of the entire circumferential length. It is preferable that the plate-shaped region HPa and the variable thickness region HPn are provided over the entire circumference.

[0079] 5 and 6, the protection ring 210 has a first surface 210a facing the lower surface of the lid body 220, a second surface 210b opposite the first surface 210a facing the flange portion 122 of the container nozzle 120, an inner peripheral side surface 210c1 connecting the inner peripheral edge of the first surface 210a and the inner peripheral edge of the second surface 210b, and an outer peripheral side surface 210c2 connecting the outer peripheral edge of the first surface 210a and the outer peripheral edge of the second surface 210b, in which the metal ring 2100 is exposed without being covered by the glass layer GL on the outer peripheral side surface 210c2. Also, at both ends in the axial direction of the protection ring 210, the outer peripheral side surface 210c2 is a highly corrosion-resistant surface SH, but the intermediate portion is a base surface SB.

[0080] In order to prevent the base surface SB from rusting due to liquid adhering to the underside of the lid body 220 when the lid is opened or closed, the protection ring 210 may have the entire outer circumferential side surface 210c2 as a highly corrosion-resistant surface SH, as shown in Fig. 7. That is, the highly corrosion-resistant surface SH of the metal ring 2100 may be provided so as to extend beyond the corner between the first surface 2100a and the outer circumferential side surface 2100c2 to the outer circumferential side surface 2100c2 and to the corner between the outer circumferential side surface 2100c2 and the second surface 2100b.

[0081] In such a case, the metal ring 2100 constituting the protection ring 210 may be composed of two ring members that are doubled on the inside and outside in the radial direction, for example, as shown in Fig. 8. That is, the outer peripheral surface of the inner ring 2110 on the inside in the radial direction and the inner peripheral surface of the outer ring 2120 surrounding the inner ring 2110 may be joined by a method such as welding, and the metal ring 2100 in which the outer peripheral side surface 2100c2 is entirely the highly corrosion-resistant surface SH by adopting a highly corrosion-resistant metal as the outer ring 2120 may be used as a metal product for forming the glass layer GL. Note that when welding the outer ring 2120 and the inner ring 2110, the welding material does not need to be a highly corrosion-resistant metal, and may be an iron-based metal or the like.

[0082] As shown in Figure 9, in the same manner as the protection ring 210, for the container nozzle 120, a notch is provided in the flange portion 1220 of the metal nozzle 1200 which forms the base of the container nozzle 120, and a highly corrosion-resistant metal is filled into the notch to form a highly corrosion-resistant portion HP. A highly corrosion-resistant surface SH and a base surface SB are provided on the upper surface of the flange portion 1220, and the edge GLe of the glass layer GL is positioned on the highly corrosion-resistant surface SH, thereby suppressing the occurrence of chipping.

[0083] In addition, a spigot structure as shown in Fig. 10 can also be adopted. In the container nozzle 120 illustrated in Fig. 10, the highly corrosion-resistant portion HP has a step, and the highly corrosion-resistant surface SH is provided with a low-step region SHL on the lower step side of the step, a high-step region SHH on the higher step side of the step, and a connection region SHC connecting the low-step region SHL and the high-step region SHH, and the glass layer GL is baked to the low-step region SHL, and the edge portion of the glass layer GL is baked to the connection region SHC. In this embodiment, the occurrence of chipping can be further suppressed. Such a spigot structure can also be adopted for the protection ring 210.

[0084] As shown in FIG. 11, the edge GLe of the glass layer GL may be provided in the variable thickness region HPn, in both the protection ring 210 and the container nozzle 120.

[0085] Although a detailed description will not be repeated here, chipping can also be suppressed for the lid body 220 by forming notches at the outer circumferential corners of the base plate portion 2210 of the metal lid 2200 and the outer circumferential corners of the metal lid flange portion 2230 to form highly corrosion-resistant portions HP and baking the glass layer GL. In this case, a spigot structure or the like may also be adopted. In this embodiment, when glazing any metal product, the area to be glazing can be determined using the edge of the metal product as a guide, which improves workability. As described above, in this embodiment, a glass-lined product that is easy to manufacture and has excellent corrosion resistance is provided.

[0086] In the above, the protection ring 210 and the metal cover flange portion 2230 are exemplified as having a circular shape in plan view, but the above-mentioned effects are also exhibited for those having a square shape in plan view or a polygonal shape other than a square. In addition, the above-mentioned effects are also exhibited for general-purpose enamel products other than glass-lined products. In addition, the above-mentioned effects are exhibited not only for enamel products but also for other glass-coated products.

[0087] As described above, this specification includes the following disclosures.

[0088] (1) A glass-coated product in which a glass layer is baked onto the surface of a metal product, The metal product comprises a base portion made of an iron-based metal, and a highly corrosion-resistant portion made of a highly corrosion-resistant metal having a higher content of at least one of nickel and chromium than the iron-based metal, The surface of the metal product is provided with a base surface which is a surface of the base portion, and a highly corrosion-resistant surface which is a surface of the highly corrosion-resistant portion, When the edge portion of the glass layer is viewed from the thickness direction of the glass layer, the highly corrosion resistant surface is provided to extend from an edge of the metal product; A glass coated product having an edge of the glass layer positioned on the highly corrosion resistant surface.

[0089] (2) When a boundary line is set along an edge of the glass layer when viewed in the thickness direction, and a virtual plane perpendicular to the extending direction of the boundary line is set, a cross section on the virtual plane is defined as a cross section in the thickness direction, the highly corrosion-resistant portion is laminated on the base portion in the thickness direction cross section, 2. The glass-coated product according to claim 1, wherein the highly corrosion-resistant portion has a bonding surface with the base portion, the bonding surface being the opposite surface to the highly corrosion-resistant surface.

[0090] (3) The glass-coated product according to (2), wherein the cross-sectional shape of the highly corrosion-resistant portion in the thickness direction cross section is a horizontally elongated shape that is long in a direction perpendicular to the thickness direction.

[0091] (4) The glass-coated product according to (2) or (3), wherein the shape of the joining surface in the thickness direction cross section is linear.

[0092] (5) The highly corrosion resistant portion is The plate-like region has a horizontally elongated band shape in the thickness direction cross section, The glass layer is A glass-coated product according to any one of (2) to (4), wherein the edge portion is baked onto the plate-shaped region.

[0093] (6) The highly corrosion resistant portion is The thickness observed in the thickness direction cross section has a variable thickness region that changes at a constant rate in a direction perpendicular to the thickness direction, The glass layer is A glass-coated product according to any one of (2) to (4), wherein the edge portion is baked into the region of the variable thickness.

[0094] (7) The metal product includes a plate-shaped portion, the plate-shaped portion has a first surface, a second surface opposite to the first surface, and a side surface connecting edges of the second surface and the first surface; the highly corrosion resistant surface constitutes at least a portion of the first surface; the edge of the glass layer is located on the highly corrosion resistant surface that constitutes at least a portion of the first surface; The glass-coated product according to any one of (1) to (6), wherein the highly corrosion-resistant surface extends onto the side surface beyond a corner between the first surface and the side surface, and extends to a corner between the side surface and the second surface.

[0095] (8) the highly corrosion resistant portion has a step, and the highly corrosion resistant surface is provided with a low step region on the low step side of the step, a high step region on the high step side of the step, and a connection region connecting the low step region and the high step region, 8. The glass-coated product according to any one of (1) to (7), wherein the glass layer is baked onto the lower stage region, and an edge portion of the glass layer is baked onto the connection region.

[0096] The present invention is not limited to the above examples and various modifications can be made. [Explanation of symbols]

[0097] 1: Reactor, 10: tank body, 10c: storage space, 100: Metal tank, 110: main body, 111: trunk, 112: bottom, 113: ceiling, 120: container nozzle, 121: cylindrical portion, 122: flange portion, 1100: metal tank body, 1110: body, 1110c: central axis, 1120: bottom, 1130: ceiling, 1200: metal nozzle, 1210: cylindrical portion, 1220: flange portion, 1220a: first surface, 1220b: second surface, 1220c: side surface, 20: Lid member, 200: Metal lid material, 210: protection ring, 210c1: inner peripheral side surface, 210c2: outer peripheral side surface, 220: lid body, 220w: glass window, 221: base plate, 222: lid cylindrical part, 223: lid flange part, 224: glass plate, 225: window frame part, 2100: metal ring, 2100': primary member, 2100": secondary member, 2100a: first surface, 2100b: second surface, 2100c1: inner peripheral side surface, 2100c2: outer peripheral side surface, 2110: inner ring, 2120: outer ring, 2200: gold cover, 2210: base plate, 2220: gold cover cylindrical part, 2230: gold cover flange part, BP: base portion, BP1: notch portion, BP1': notch portion, CN: Corner, CF: joint surface, GL: glass layer, GL1: bottom glass layer, GL2: top glass layer, GLe: edge, HP: High corrosion resistance area, HPa: Plate area, HPn: Variable thickness area, LL: Boundary line, S1: Gasket, S2: Gasket, S3: Gasket, S4: Gasket, SB: Base surface, SH: Highly corrosion resistant surface, SHC: Connection region, SHH: High-level region, SHL: Low-level region, W1: bottom wall, W2: vertical wall, WB:Bead

Claims

1. A glass-coated product in which a glass layer is baked onto the surface of a metal product, The metal product comprises a base portion made of an iron-based metal, and a highly corrosion-resistant portion made of a highly corrosion-resistant metal having a higher content of at least one of nickel and chromium than the iron-based metal, The surface of the metal product is provided with a base surface which is a surface of the base portion, and a highly corrosion-resistant surface which is a surface of the highly corrosion-resistant portion, When the edge portion of the glass layer is viewed from the thickness direction of the glass layer, the highly corrosion resistant surface is provided to extend from an edge of the metal product; A glass coated product having an edge of the glass layer positioned on the highly corrosion resistant surface.

2. When a boundary line is set along an edge of the glass layer when viewed in the thickness direction, and a virtual plane perpendicular to the extending direction of the boundary line is set, a cross section on the virtual plane is defined as a cross section in the thickness direction, the highly corrosion-resistant portion is laminated on the base portion in the thickness direction cross section, 2. A glass-coated product according to claim 1, wherein said highly corrosion-resistant portion has a joining surface with said base portion which is opposite said highly corrosion-resistant surface.

3. 3. The glass-coated product according to claim 2, wherein the cross-sectional shape of the highly corrosion-resistant portion in the thickness direction cross section is a horizontally elongated shape that is long in a direction perpendicular to the thickness direction.

4. 3. A glass-coated product according to claim 2, wherein the shape of said joining surface in said cross section in the thickness direction is linear.

5. The highly corrosion resistant portion is The plate-like region has a horizontally elongated band shape in the thickness direction cross section, The glass layer is 3. A glass coated article as claimed in claim 2, wherein an edge is baked onto said plate-like region.

6. The highly corrosion resistant portion is The thickness observed in the thickness direction cross section has a variable thickness region that changes at a constant rate in a direction perpendicular to the thickness direction, The glass layer is 3. A glass coated article as claimed in claim 2, wherein an edge is burned into said area of ​​thickness change.

7. The metal product includes a plate-shaped portion, the plate-like portion has a first surface, a second surface opposite to the first surface, and a side surface connecting edges of the second surface and the first surface; the highly corrosion resistant surface constitutes at least a portion of the first surface; the edge of the glass layer is located on the highly corrosion resistant surface that constitutes at least a portion of the first surface; 2. The glass coated article of claim 1, wherein the highly corrosion resistant surface extends onto the side surface beyond a corner between the first surface and the side surface and extends to a corner between the side surface and the second surface.

8. the highly corrosion resistant portion has a step, and the highly corrosion resistant surface is provided with a low step region on the low step side of the step, a high step region on the high step side of the step, and a connection region connecting the low step region and the high step region, 2. The glass coated article of claim 1, wherein said glass ply is fired to said step area and an edge of said glass ply is fired to said connection area.

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