Composite blank preparation process of hot-rolled composite board

Abstract

The invention discloses a composite blank preparation process of a hot-rolled composite board, and relates to the technical field of hot-rolled composite boards, and the composite blank preparation process comprises the following steps: taking two base materials and two covering materials; the to-be-combined face of the base material is polished, any end face of the covering material is coated with an isolating agent and then baked, and the other end face of the covering material is polished after baking is completed; any base material is firstly ground upwards, a sealing strip is welded to the upper end face of the base material, and a cavity with an opening in the upper end is defined between the sealing strip and the upper end face of the base material; the base material, the covering material, the covering material and the base material are sequentially stacked from bottom to top to form a composite blank, an isolating strip is arranged between the base material and the covering material, and the covering material and the isolating strip are both located in the cavity; the sealing strip is welded to the base material located on the upper portion; and the composite blank is welded and reinforced. Through the special design of the hot-rolled composite blank, the problems that interface elements are excessively diffused and the performance of a covering material is difficult to guarantee when a composite plate is produced by adopting a traditional blank manufacturing process are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hot-rolled composite plates, in particular to a composite billet preparation process for hot-rolled composite plates. Background Art

[0002] Currently, there are two main methods for preparing metal composite plates: explosive cladding and hot rolling cladding. The hot rolling cladding method requires a production process including composite billet preparation, heating, and rolling.

[0003] The traditional composite billet preparation process requires the overlay material and the base material to be stacked together, and the bonding surface must be tightly fitted. During the subsequent heating and rolling process, due to the concentration gradient of the alloy elements in the overlay material and the base material, the elements near the bonding surface of the overlay material and the base material diffuse into each other and form a strong metallurgical bond. Taking the stainless steel-steel composite plate as an example, the Cr, Ni and other elements in the stainless steel near the interface diffuse into the carbon steel, and the C, Fe and other elements in the carbon steel diffuse into the stainless steel. The maximum diffusion distance can reach several hundred microns. Although the mutual diffusion between elements can form a strong metallurgical bond between the overlay material and the base material, there are the following problems: First, the content of Cr and Ni elements in the overlay material is reduced, which reduces the corrosion resistance of the overlay material; second, after the C element in the carbon steel diffuses to the overlay material side, it forms M with the Cr element at the grain boundary. 23 C6 carbides also reduce the corrosion resistance of the cladding material. Especially for composite panels with extremely thin cladding materials, the corrosion resistance of the cladding material cannot be guaranteed after removing the diffusion-affected zone. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a composite billet preparation process for hot-rolled composite plates.

[0005] In order to solve the above technical problems, the technical solutions of the present invention are as follows: A process for preparing a composite billet of a hot-rolled composite plate, comprising: Take two sheets of base material and two sheets of covering material; The surface to be bonded of the substrate is polished, a release agent is applied to one end surface of the covering material and then baked, and the other end surface is polished after baking; Grind any substrate upwards and weld a seal to the upper end of the substrate, with the seal and the upper end of the substrate forming a cavity with an open top. The composite blank is formed by stacking the substrate, the covering material, the covering material, and the substrate in the order of bottom to top, with the polished surfaces of the substrate and the covering material facing each other, the end surfaces of the two covering materials coated with the release agent facing each other, and an isolation strip being provided between the substrate and the covering material, wherein the covering material and the isolation strip are both located in the cavity; Welding the seal to the upper substrate; The composite billet is subjected to welding reinforcement treatment.

[0006] As a preferred solution of the composite billet preparation process of the hot-rolled composite plate of the present invention, the closed shape enclosed by the sealing strip is similar to the end face shape of the covering material, and the height of the sealing strip is the sum of the heights of the two covering materials and the sum of the heights of the two isolation strips.

[0007] As a preferred solution of the process for preparing the composite billet of the hot-rolled composite plate of the present invention, the isolation strips are fixed to the corners of the cladding material by spot welding.

[0008] As a preferred solution of the process for preparing the composite billet of the hot-rolled composite plate of the present invention, the isolation strip is cylindrical or rectangular.

[0009] As a preferred solution of the process for preparing the composite blank of the hot-rolled composite plate of the present invention, a gap is left between the sealing strip and the side surface of the covering material to form a first air channel.

[0010] As a preferred embodiment of the process for preparing the composite blank of the hot-rolled composite plate of the present invention, a second air channel is provided inside any of the substrates, one end of the second air channel extends to the side of the substrate, and the other end of the second air channel extends into the cavity and communicates with the first air channel; After welding the seal strip to the upper substrate, the method further comprises: A first vacuuming process is performed on the interior of the composite blank through the first air channel and the second air channel.

[0011] As a preferred solution of the process for preparing the composite billet of the hot-rolled composite plate of the present invention, the vacuum degree in the composite billet after the first vacuum treatment is less than or equal to 50 Pa.

[0012] As a preferred solution of the process for preparing the composite billet of the hot-rolled composite plate of the present invention, the welding reinforcement treatment of the composite billet includes: The composite blank is welded and reinforced by using submerged arc welding, and the weld formed by welding completely fills the gap between the two substrates and the seal.

[0013] As a preferred solution of the process for preparing the composite billet of the hot-rolled composite plate of the present invention, after the composite billet is subjected to welding reinforcement treatment, the process further comprises: The interior of the composite blank is vacuumed for the second time.

[0014] As a preferred solution of the process for preparing the composite billet of the hot-rolled composite plate of the present invention, the vacuum degree in the composite billet after the second vacuum treatment is less than or equal to 40 Pa.

[0015] The beneficial effects of the present invention are: (1) The present invention solves the problem of excessive diffusion of interface elements and difficulty in ensuring the performance of the covering material when using traditional blank making process to produce composite plates, especially composite plates with extremely thin covering materials, by specially designing the hot-rolled composite billet, applying an isolation agent on the opposite end faces of the two covering materials, and providing an isolation strip between the substrate and the covering material.

[0016] (2) The present invention reduces the oxidation problem of the inner edge of the composite blank during the welding process by performing two vacuum treatments, reduces the area of ​​the composite plate edge that is not bonded, and thus improves the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 This is a schematic diagram of the stacking order of various materials during the composite billet assembly process of hot-rolled composite plates; Figure 2 is a schematic cross-sectional view of a composite billet of a hot-rolled composite plate; Among them: 1. Base material; 2. Isolation strip; 3. Covering material; 4. Seal; 5. First air duct; 6. Second air duct; 7. Primary weld; 8. Secondary weld; 9. Tertiary weld. DETAILED DESCRIPTION

[0019] In order to make the contents of the present invention more clearly understood, the present invention is further described below in detail based on specific implementation methods in conjunction with the accompanying drawings.

[0020] The present invention provides a process for preparing a composite blank of a hot-rolled composite plate, which process specifically includes the following steps: Step S101: Take two substrates 1 and two cover materials 3.

[0021] Specifically, two rectangular substrates 1 and two rectangular cover materials 3 are used. The two substrates 1 have the same shape, the two cover materials 3 have the same shape, and the length of the substrate 1 is greater than the length of the cover material 3, and the width of the substrate 1 is greater than the width of the cover material 3.

[0022] Step S102: grinding the surface to be bonded of the substrate 1, applying a release agent to any end surface of the covering material 3 and then baking it, and grinding the other end surface after baking.

[0023] Step S103 : Turn the polished side of any substrate 1 upwards, and weld a seal 4 to the upper end surface of the substrate 1 , so that a cavity with an open upper end is formed between the seal 4 and the upper end surface of the substrate 1 .

[0024] For details, see Figure 2 Seal strip 4 is welded vertically to the upper end surface of substrate 1. The primary weld seam 7 formed by the welding is located on the outside of seal strip 4. The closed shape formed by seal strip 4 is similar to the end surface of cover material 3, both of which are rectangular. A cavity with an open top is formed between seal strip 4 and the upper end surface of substrate 1.

[0025] It should be noted that the length of the closed shape formed by the seal 4 is slightly greater than the length of the covered end surface, and the width of the closed shape formed by the seal 4 is slightly greater than the width of the end surface of the covering material 3, so that the covering material 3 can be placed in the above-mentioned cavity.

[0026] In this embodiment, the seal 4 is made of Q235B material which is easy to weld.

[0027] Step S104: The composite blank is formed by stacking the substrate 1, the covering material 3, the covering material 3, and the substrate 1 in the order of bottom to top, and the polished surfaces of the substrate 1 and the covering material 3 are arranged opposite to each other, and the end surfaces of the two covering materials 3 coated with the release agent are arranged opposite to each other, and an isolation strip 2 is arranged between the substrate 1 and the covering material 3, and the covering material 3 and the isolation strip 2 are both located in the cavity.

[0028] Specifically, Figure 1 The diagram is a schematic diagram of the stacking order of the materials in the composite blank. Figure 1 It can be seen that the isolation strips 2 are fixed to the corners of the covering material 3 by spot welding.

[0029] The isolation strip 2 is cylindrical or rectangular. Figure 1 In this embodiment, the isolation strip 2 is cylindrical and has a height of 3 to 10 mm.

[0030] Step S105 : welding the seal 4 to the upper substrate 1 .

[0031] Specifically, Figure 2 The secondary weld 8 formed by welding the seal 4 to the upper substrate 1 is located on the outside of the seal 4. Figure 2 The height of the seal 4 is the sum of the heights of the two covering materials 3 and the sum of the heights of the two isolation strips 2, that is, the height of the seal 4 = the height of the isolation strip 2 + the height of the covering material 3 + the height of the covering material 3 + the height of the isolation strip 2. In this way, after the seal 4 is welded and fixed to the upper substrate 1, the lower end surface of the upper substrate 1 is just in contact with the adjacent isolation strip 2.

[0032] Depend on Figure 2It can be seen that in the stacked composite blank, a gap of 2 to 10 mm is left between the sealing strip 4 and the side of the covering material 3, forming a first air channel 5. Furthermore, an L-shaped second air channel 6 is defined within each substrate 1. One end of the second air channel 6 extends to the side of the substrate 1, while the other end extends into the cavity and communicates with the first air channel 5, facilitating subsequent vacuum treatment of the composite blank.

[0033] Step S106 : performing a first vacuuming process on the interior of the composite blank through the first air channel 5 and the second air channel 6 .

[0034] Specifically, to reduce the problem of internal oxidation of the composite blank caused by subsequent welding, the interior of the composite blank needs to be vacuumed after the seal 4 is welded to the upper substrate 1. By connecting the vacuuming device to the end of the second air channel 6, the interior of the composite blank can be vacuumed.

[0035] It should be noted that the vacuum degree in the composite blank after the first vacuum treatment is less than or equal to 50 Pa.

[0036] Step S107: performing welding reinforcement processing on the composite blank.

[0037] Specifically, in order to prevent the composite billet from cracking during the subsequent production process, it is necessary to further weld and reinforce the composite billet using submerged arc welding or other welding methods. Figure 2 The weld formed by welding completely fills the gap between the two substrates 1 and the seal 4.

[0038] Step S108: performing a second vacuuming process on the composite blank.

[0039] Specifically, after the welding reinforcement process is completed, the interior of the composite blank needs to be vacuumed for the second time. After the second vacuuming process, the vacuum degree in the composite blank is less than or equal to 40Pa.

[0040] It should be noted that after the second vacuuming process is completed, the through hole on the side of the substrate 1 needs to be immediately sealed with the second air channel 6 of the welding material.

[0041] Thus, the technical solution of this application, through the special design of the hot-rolled composite billet, solves the problem of excessive diffusion of interface elements and difficulty in ensuring the performance of the cladding material 3 when using traditional billet production processes to produce composite plates, especially those with extremely thin cladding material 3. Furthermore, the two-stage vacuum treatment reduces oxidation of the internal edges of the composite billet during welding, reducing the area of ​​unbonded edges at the composite plate, thereby improving the yield rate.

[0042] In addition to the above embodiments, the present invention may also have other implementation methods; any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A process for preparing a composite billet of a hot-rolled composite plate, characterized in that: include: Take two sheets of base material (1) and two sheets of covering material (3); The surface to be bonded of the substrate (1) is polished, a release agent is applied to any end surface of the covering material (3) and then baked, and the other end surface is polished after baking; The polished side of any substrate (1) is first directed upwards, and a seal (4) is welded to the upper end surface of the substrate (1), with the seal (4) and the upper end surface of the substrate (1) forming a cavity with an upper end open; The composite blank is formed by stacking the substrate (1), the covering material (3), the covering material (3), and the substrate (1) in the order of bottom to top, and the polished surfaces of the substrate (1) and the covering material (3) are arranged opposite to each other, the end surfaces of the two covering materials (3) coated with the isolation agent are arranged opposite to each other, and an isolation strip (2) is arranged between the substrate (1) and the covering material (3), and the covering material (3) and the isolation strip (2) are both located in the cavity; Welding the seal (4) to the upper substrate (1); The composite billet is subjected to welding reinforcement treatment.

2. The process for preparing a composite billet of a hot-rolled composite plate according to claim 1, wherein: The closed shape formed by the sealing strip (4) is similar to the end face shape of the covering material (3), and the height of the sealing strip (4) is the sum of the heights of the two covering materials (3) and the sum of the heights of the two isolation strips (2).

3. The process for preparing a composite billet of a hot-rolled composite plate according to claim 1, wherein: The isolation strip (2) is fixed to the corners of the covering material (3) by spot welding.

4. The process for preparing a composite billet of a hot-rolled composite plate according to claim 1, wherein: The isolation strip (2) is cylindrical or rectangular.

5. The process for preparing a composite billet of a hot-rolled composite plate according to claim 1, wherein: A gap is left between the sealing strip (4) and the side surface of the covering material (3) to form a first air channel (5).

6. The process for preparing a composite billet of a hot-rolled composite plate according to claim 5, characterized in that: A second air channel (6) is provided inside any of the substrates (1), one end of the second air channel (6) extends to the side of the substrate (1), and the other end of the second air channel (6) extends into the cavity and communicates with the first air channel (5); After the seal (4) is welded to the upper substrate (1), the method further comprises: The first air channel (5) and the second air channel (6) are used to perform a first vacuum treatment on the interior of the composite blank.

7. The process for preparing a composite billet of a hot-rolled composite plate according to claim 6, wherein: After the first vacuum treatment, the vacuum degree in the composite blank is less than or equal to 50Pa.

8. The process for preparing a composite billet of a hot-rolled composite plate according to claim 1, wherein: The welding reinforcement treatment of the composite blank comprises: Submerged arc welding is used to perform welding reinforcement processing on the composite blank, and the weld formed by welding completely fills the gap between the two base materials (1) and the sealing strip (4).

9. The process for preparing a composite billet of a hot-rolled composite plate according to claim 6, wherein: After the composite blank is subjected to welding reinforcement treatment, the method further comprises: The interior of the composite blank is vacuumed for the second time.

10. The process for preparing a composite billet of a hot-rolled composite plate according to claim 9, characterized in that: After the second vacuum treatment, the vacuum degree in the composite blank is less than or equal to 40Pa.

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