ELECTROMAGNETIC STAINLESS STEEL ROD-SHAPED MATERIAL
Patent Information
- Authority / Receiving Office
- MX · MX
- Patent Type
- Patents
- Current Assignee / Owner
- NIPPON STEEL STAINLESS STEEL CORP
- Filing Date
- 2022-08-15
- Publication Date
- 2026-06-12
AI Technical Summary
Conventional ferritic stainless steel products, such as solenoid valves, exhibit insufficient soft magnetic properties for high precision/high power components, limiting their applications.
A rod-shaped stainless steel product with a specific chemical composition and controlled crystal orientation fractions, achieved through hot rolling, heat treatment, and drawing processes, to enhance soft magnetic properties.
The solution results in a rod-shaped stainless steel product with improved magnetic flux density and soft magnetic properties, suitable for high precision/high power components.
Abstract
Description
ELECTROMAGNETIC STAINLESS STEEL ROD-SHAPED MATERIAL Technical field [1] The present invention relates to a rod-shaped electromagnetic stainless steel product, in particular, a rod-shaped stainless steel product having excellent soft magnetic properties and an electromagnetic component using the same. Background of the invention [2] Electromagnetic stainless steel products, such as solenoid valves, have been conventionally produced by machining, forming, and heat-treating using ferritic stainless steel wire rod or steel wire, as illustrated by SUS430 and SUS410L. However, these stainless steel products, processed and manufactured from the aforementioned ferritic stainless steel wire rod, have insufficient soft magnetic properties for use in high-precision / high-power components, resulting in limited applications. To address this issue, an optimization technique using alloying elements such as Cr, Si, and Al has been studied to improve the soft magnetic properties (see Patent Publications 1 to / enn Ln / zznz / E / YiAi). 3). No invention to date focuses on improving the soft magnetic properties of ferritic stainless steel bars and wire rods through texture control based on a combination of constituents and processes. / enn ίη / ζζηζ / Β / γίΛΐ List of appointments Patent literature(s) [3] Patent Literature 1: JP 06-49606 A Patent Literature 2: JP 06-49605 A Patent Literature 3: JP 2004-307979 A Patent Literature 4: JP 05-329510 A Summary of the invention Problem(s) that must be solved by the invention [4] In view of the foregoing, an object of the invention is to solve the above problem and provide a rod-shaped stainless steel product having excellent soft magnetic properties and an electromagnetic component using the same. Means to solve the problems [5] The invention is made to solve the above problem and provides a rod-shaped stainless steel product and an electromagnetic component as its essence, as follows. [1] A stainless steel rod-shaped product with a chemical composition including: by mass %, 0.001 to 0.030% C, 0.01 to 4.00% Si, 0.01 to 2.00% Mn, 0.01 to 4.00% Ni, 6.0 to 35.0% Cr, 0.01 to 5.00% Mo, 0.01 to 2.00% Cu, 0.001 to 0.050% N, 0 to 2.00% Ti, 0 to 2.00% Nb, 0 to 2.0% V, 0 to 0.1% B, 0 to 7.000% Al, 0 to 3.0% W, 0 to 0.05% Ga, 0 to 2.5% Co, 0 to 2.5% Sn, 0 to 2.5% Sb, 0 to 2.5% Ta, 0 to 0.05% Ca, 0 to 0.012% Mg, 0 to 0.012% Zr, 0 to 0.05% REM, 0 to 0.30% Pb, 0 to 0.80% Se, 0 to 0.30% Te, 0 to 0.50% Bi, 0 to 0.50% S and 0 to 0.30% P, a remainder consisting of Fe and impurities, an F value shown in formula (a) below being 20.0 or less, a fraction of crystal orientation in the rolling direction RD / / <100> of the stainless steel rod-shaped product that is 0.0.5 or more, the fraction of the glass orientation in the lamination direction RD / / <100> This means a glass area ratio with an orientation difference of 25 degrees or less between an orientation <100> and a laminating address. Value F = 7000 + 800N + 20Ni + 1OCu + 1OMn - 6.2Cr 9.2Si - 9.3Mo - 74.4Ti - 37.2Al - 3.Inb + 63.2 (a) where the symbols of the elements in formula (a) mean contents (% by mass) of the respective elements in the steel. [6] [2] The rod-shaped stainless steel product in accordance with [1], wherein a fraction of the glass orientation in the direction of the laminate RD / / <334> is 0.2 or less in a position that has a depth of 1 / 8 of the diameter of a steel product from a surface of the steel product, the fraction of orientation of the glass in the direction of the rolling RD / / <334> which means a crystal area ratio that has 10 degrees or less of orientation difference between an orientation <334> and a lamination address. [7] [3] The rod-shaped stainless steel product in accordance with [1] or [2], wherein the chemical composition further includes, in mass %, at least one selected from 0.001 to 2.00% Ti, 0.001 to 2.00% Nb, 0.001 to 2.0% V, 0.0001 to 0.1% B, 0.001 to 7.000% Al, 0.05 to 3.0% W, 0.0004 to 0.05% Ga, 0.05 to 2.5% Co, 0.01 to 2.5% Sn, 0.01 to 2.5% Sb and 0.01 to 2.5% Ta. [8] [4] The rod-shaped stainless steel product conforming to any of [1] to [3], wherein the chemical composition further includes, in % by mass, at least one selected from 0.0002 to 0.05% Ca, 0.0002 to 0.012% Mg, 0.0002 to 0.012% Zr, and 0.0002 to 0.05% REM. / enn Ln / zznz / B / YiAi [9] [5] The rod-shaped stainless steel product conforming to any of [1] to [4], wherein the chemical composition further includes, in % by mass, at least one selected from 0.0001 to 0.30% Pb, 0.0001 to 0.80% Se, 0.0001 to 0.30% Te, 0.0001 to 0.50% Bi, 0.0001 to 0.50% S and 0.0001 to 0.30% P.
[10] [6] The rod-shaped stainless steel product conforming to any of [1] to [5], having a magnetic flux density of 0.10 T or more at 5 Oe. [7] The rod-shaped stainless steel product conforming to any of [1] to [6], having a maximum magnetic flux density of 0.05 T or more at 10 Oe and an alternating current frequency of 2 kHz.
[11] [8] An electromagnetic component using the rod-shaped stainless steel product in accordance with any of [1] to [7].
[12] In accordance with the above aspects of the invention, a rod-shaped stainless steel product can be provided having excellent soft magnetic properties and an electromagnetic component. Description of the modality(ies)
[13] The inventors studied extensively to obtain a rod-shaped stainless steel product that had excellent soft magnetic properties and an electromagnetic component. As a result, the following findings (a) to (c) have been obtained.
[14] (a) A fraction of crystal orientation RD / / <100> In one direction of wire rod rolling, the rolling time can be increased by combining ferritic stainless steel with a hot rolling process (biased rolling time). Furthermore, a fraction of the crystal orientation RD / / <334> In the rolling direction of the wire rod, it can be reduced in a portion from a surface of the wire rod to a position at a depth of 1 / 4 of the wire rod diameter.
[15] (b) A fraction of crystal orientation RD / / <100> The rolling direction of the steel wire can be increased by combining factors such as wire rod processing and secondary working processes (heat treatment temperature for the wire rod, drawing speed, and heat treatment temperature for the steel wire). Furthermore, a fraction of the crystal orientation RD / / <334> In the rolling direction of the steel wire, it can be reduced in a portion from a surface of the steel wire to a position at a depth of 1 / 4 of the diameter of the steel wire.
[16] (c) As a result, a magnetic flux density of 0.10 T or more at 5 Oe, and a maximum magnetic flux density of 0.05 T or more at 2 kHz and 10 Oe. The improvement in soft magnetic properties has been found.
[17] The invention is based on prior discoveries. An illustrative preferred embodiment of the invention will be described in detail. In the following description, the preferred illustrative embodiment of the invention will be referred to as the invention. The requirements of the invention will be described in detail below. With respect to rod-shaped steel products according to the invention, a hot-worked product left as such is called a steel bar and wire rod, a cold-worked product such as wire drawing is called steel wire, and the steel bar, wire rod, and steel wire are collectively referred to as a rod-shaped steel product. / enn ίη / ζζηζ / Ε / γίΛΐ
[18] 1. Fraction of glass orientation in the direction of the laminate RD / / <100> In a rod-shaped steel product according to the invention, the orientation of the glass in a rolling direction (RD) is controlled. Specifically, a fraction of the glass orientation in the rolling direction RD / / <100> (area ratio) (hereinafter referred to simply as fraction RD / / <100> ) is defined as 0.05 or more. This is because the soft magnetic properties are reduced by a fraction RD / / <100> less than 0.05. The fraction RD / / <100> It is very preferably 0.10 or more, very preferably 0.20 or more, and very preferably still 0.40 or more.
[19] The RD fraction / / <100> It is calculated according to the following procedure. Specifically, the fraction RD / / <100> This is obtained by measuring at least one field of view at 200x magnification on each of a portion of the surface layer, a core portion, and a 1 / 4 depth position existing between the surface layer portion and the core portion in an L-shaped cross-section of the rod-shaped steel product (i.e., a cross-section parallel to the longitudinal direction of the steel product). The crystal orientation of each crystal grain in the observed fields of view is analyzed using FE-SEM / EBSD. One rolling direction is represented by RD. A crystal plane is analyzed in the RD direction. The components are unfolded in an orientation <100> only in a clearance of 25 degrees or less and the fraction RD / / is measured <100> .The surface layer portion refers to a position at a depth of 1 mm in a central axial direction from the surface of the steel product. Specifically, the fraction of the glass orientation in the rolling direction RD / / <100> This means a glass area ratio that has an orientation difference of 25 degrees or less between the orientation <100> and the lamination direction (an average of the surface layer portion, the middle portion, and the 1 / 4 depth position). / enn Ln / zznz / E / YiAi
[20] 2. Fraction of glass orientation in the direction of the laminate RD / / <334> In a rod-shaped steel product according to the invention, a crystal orientation that impairs the soft magnetic properties in the rolling direction (RD) is preferably controlled. The fraction of crystal orientation RD / / <334> In the rolling direction of a steel bar and wire rod, it is preferably defined at 0.20 or less at a position at a depth of 1 / 8 of the diameter of the steel product from the surface thereof. A fraction of the glass orientation in the direction of the laminate RD / / <334> (area ratio) (hereinafter referred to simply as fraction RD / / <334> ) is defined as 0.20 or less. This is because the soft magnetic properties are reduced by a fraction RD / / <334> greater than 0.2. The fraction RD / / <334> It is very preferably 0.10 or less, and very preferably still 0.05 or less.
[21] The RD fraction / / <334> It is calculated according to the following procedure. Specifically, the fraction RD / / <334> This is obtained by measuring at least one field of view at 200x magnification at a depth of 1 / 8, located between a surface of the rod-shaped steel product and a depth of 1 / 4 of the rod-shaped steel product, in an L-shaped cross-section of the steel product (i.e., a cross-section parallel to the longitudinal direction of the steel product). The crystal orientation of each crystal grain in the observed fields of view is analyzed using FE-SEM / EBSD. One rolling direction is represented by RD. A plane of the crystal is analyzed in the RD direction. The components in one orientation are shown. <334> only in a clearance of 10 degrees or less and the fraction RD / / is measured <334> .Specifically, the fraction of the glass orientation in the lamination direction RD / / <334> This means a glass area ratio that has an orientation difference of 10 degrees or less between the orientation <334> and the rolling direction (at a position at a depth of 1 / 8 of the diameter of the steel product from the surface of the product). / enn Ln / zznz / B / YiAi
[22] 3. Chemical composition The reasons for limiting the elements are as follows. It should be noted that a % indication for the content of each element means % by mass in the following description.
[23] C: 0.001 to 0.030% The C increases the strength of the steel product. For this reason, a carbon content is defined as 0.001% or more. However, an excessive carbon content deteriorates the soft magnetic properties. Therefore, the carbon content is defined as 0.030% or less. The carbon content is preferably 0.020% or less, very preferably 0.015% or less, and most preferably 0.010% or less.
[24] Yes: 0.01 to 4.00% Silicon (Si) is included as a deoxidizing agent to improve high-temperature oxidation properties and AC magnetic properties. For this reason, the Si content is defined as 0.01% or more, and preferably 0.10% or more. However, excessive Si content impairs soft magnetic properties. Therefore, the Si content is defined as 4.00% or less. The Si content is preferably 3.00% or less, and very preferably 1.50% or less.
[25] Mn: 0.01 to 2.00% Manganese (Mn) improves the strength of steel products and their alternating current magnetic properties. For this reason, a manganese content of 0.01% or more is defined, and preferably 0.05% or more. However, excessive manganese content reduces soft magnetic properties. Furthermore, corrosion resistance may decrease. For this reason, the manganese content is defined as 2.00% or less. The manganese content is preferably 1.00% or less, and very preferably 0.50% or less.
[26] Ni: 0.01 to 4.00% Ni improves the toughness of the steel product. For this reason, the Ni content is defined as 0.01% or more, and / enn Ln / zznz / B / YiAi
[29] Cu: 0.01 to 2.00% Copper (Cu) improves corrosion resistance and AC magnetic properties. For this reason, the Cu content is defined as 0.01% or more, and preferably 0.05% or more. However, excessive Cu content reduces soft magnetic properties. For this reason, the Cu content is defined as 2.00% or less. The Cu content is preferably 1.00% or less, very preferably 0.80% or less, and most preferably still 0.40% or less.
[30] N: 0.001 to 0.050% Nitrogen (N) increases the strength of the steel product. For this reason, a N content is defined as 0.001% or more, and preferably 0.002% or more. However, an excessive N content reduces the soft magnetic properties. For this reason, the N content is defined as 0.050% or less. The N content is preferably 0.040% or less, very preferably 0.020% or less, and most preferably still 0.010% or less.
[31] A rod-shaped steel product of the invention may contain at least one element selected from Ti, Nb, V, B, Al, W, Ga, Co, Sn, Sb and Ta as required, in addition to the aforementioned elements.
[32] Ti: 0 to 2.00% Titanium (Ti) increases the strength of steel products. Furthermore, because Ti forms carbonitrides, it inhibits the formation of chromium carbides, thus preventing the formation of chromium-deficient layers. As a result, Ti prevents intergranular corrosion. In other words, since Ti improves corrosion resistance, its content can be adjusted as needed. Additionally, Ti enhances the magnetic properties of soft steel by binding carbon and nitrogen through the formation of Ti carbonitrides. However, excessive Ti content reduces soft magnetic properties. Furthermore, coarse carbonitrides reduce toughness. For this reason, the Ti content is defined as 2.00% or less. The Ti content is preferably 1.00% or less, very preferably 0.50% or less, and very preferably still 0.25% or less. On the other hand, the Ti content is preferably 0.001% or more to achieve the aforementioned effects.
[33] Nb: 0 to 2.00% Nitrogen (Nb) increases the strength of steel products. Furthermore, because Nb forms carbonitrides, it inhibits the formation of chromium carbides, thus preventing the formation of chromium-deficient layers. As a result, Nb helps prevent intergranular corrosion. In other words, since Nb is an effective element for improving corrosion resistance, its content can be adjusted as needed. Additionally, Nb enhances soft magnetic properties by fixing carbon and nitrogen through the formation of Nb carbonitrides. However, excessive Nb content reduces soft magnetic properties. Furthermore, coarse carbonitrides reduce toughness. For this reason, the Nb content is defined as 2.00% or less. The Nb content is preferably 1.00% or less, very preferably 0.80% or less, and even more preferably 0.60% or less. Moreover, the Nb content is preferably 0.00%.0.01% or more to obtain the aforementioned effects.
[34] V: 0 to 2.0% Since vanadium (V) has the effect of improving corrosion resistance, its content can be adjusted as needed. However, excessive V content reduces soft magnetic properties. Furthermore, coarse carbonitrides reduce toughness. For this reason, the V content is defined as 2.0% or less. The V content is preferably 1.0% or less, very preferably 0.5% or less, and most preferably still 0.1% or less. On the other hand, the V content is preferably 0.001% or more to achieve the aforementioned effects.
[35] B: 0 to 0.1% The B element has effects of improving hot workability and corrosion resistance. Therefore, the / enn ίη / ζζηζ / Β / γίΛΐ The content of B can be adjusted as needed. However, excessive B content reduces the soft magnetic properties. For this reason, the B content is defined as 0.1% or less. The B content is preferably 0.02% or less, and very preferably 0.01% or less. On the other hand, the B content is preferably 0.0001% or more to achieve the aforementioned effects.
[36] Al: 0 to 7,000% Since aluminum (Al) promotes deoxidation to improve the cleanliness of inclusions, its content can be adjusted as needed. Furthermore, the addition of Al enhances the magnetic properties of alternating current. However, excessive Al content saturates this effect and reduces the soft magnetic properties. Additionally, coarse inclusions reduce toughness. For this reason, the Al content is defined as 7.000% or less. The Al content is preferably 3.000% or less, very preferably 0.100% or less, and even more preferably 0.020% or less. On the other hand, the Al content is preferably 0.001% or more to achieve the aforementioned effects.
[37] W: 0 to 3.0% Since W has the effect of improving corrosion resistance, W can be included as needed. However, excessive W content reduces the soft magnetic properties. Furthermore, coarse carbonitrides reduce toughness. For this reason, the W content is defined as 3.0% or less. The W content is preferably 2.0% or less, and very preferably 1.5% or less. On the other hand, to obtain the aforementioned effects, the W content is preferably 0.05% or more, and very preferably 0.10% or more.
[38] Ga: 0 to 0.05% Since gallium (Ga) improves corrosion resistance, its content can be adjusted as needed. However, excessive Ga content reduces hot workability. Therefore, the Ga content is defined as 0.05% or less. On the other hand, a Ga content of 0.0004% or more is preferable to achieve the aforementioned effects.
[39] Co: 0 to 2.50% Since cobalt (Co) has the effect of improving the strength of the steel product, Co can be included as needed. Furthermore, a moderate amount of Co increases the saturated magnetic flux density, resulting in improved soft magnetic properties. However, excessive Co content reduces soft magnetic properties. For this reason, the Co content is defined as 2.50% or less. The Co content is preferably 1.00% or less, and very preferably 0.80% or less. On the other hand, to obtain the aforementioned effects, the Co content is preferably 0.05% or more, and very preferably 0.10% or more.
[40] Sn: 0 to 2.50% Since Sn has effects on improving soft magnetic properties, corrosion resistance, and machinability, Sn can be included as needed. However, excessive Sn content reduces soft magnetic properties. Furthermore, toughness decreases due to Sn segregation at the grain boundaries. For this reason, the Sn content is defined as 2.50% or less. The Sn content is very preferably 1.00% or less, and very preferably 0.20% or less. On the other hand, to obtain the aforementioned effects, the Sn content is preferably 0.01% or more, and very preferably 0.05% or more.
[41] Sb: 0 to 2.5% Since antimony (Sb) improves corrosion resistance, its content can be adjusted as needed. However, excessive Sb content reduces the soft magnetic properties. For this reason, the Sb content is defined as 2.5% or less. A Sb content of 1.0% or less is highly preferred, and 0.2% or less is very preferred. On the other hand, to achieve the aforementioned effects, the Sb content is preferably 0.01% or more, and 0.05% or more is highly preferred.
[42] Ta: 0 to 2.5% Since titanium (Ta) has the effect of improving corrosion resistance, it can be included as needed. However, an excessive titanium (Ti) content reduces the soft magnetic properties. For this reason, the Ta content is defined as 2.5% or less. The Ta content is preferably 1.5% or less, and very preferably 0.9% or less. On the other hand, to obtain the aforementioned effects, the Ta content is preferably 0.01% or more, very preferably 0.04% or more, and very preferably still 0.08% or more.
[43] A rod-shaped steel product of the invention may contain at least one element selected from Ca, Mg, Zr and REM as required, in addition to the aforementioned elements. Ca: 0 to 0.05% Mg: 0 to 0.012% Zr: 0 to 0.012% REM: 0 to 0.05% Ca, Mg, Zr, and REM may be included for deoxidation as needed. However, excessive Ca, Mg, Zr, and REM content reduces soft magnetic properties. Furthermore, coarse inclusions reduce toughness. For this reason, Ca is defined as 0.05% or less, Mg as 0.012% or less, Zr as 0.012% or less, and REM as 0.05% or less. The Ca content is preferably 0.010% or less, and very preferably 0.005% or less. The Mg content is preferably 0.010% or less, and very preferably 0.005% or less. The Zr content is preferably 0.010% or less, and very preferably 0.005% or less. REM is preferably 0.010% or less. On the other hand, to obtain the aforementioned effects, the following are preferable: Ca content of 0.0002% or more, Mg content of 0.0002% or more, Zr content of 0.0002% or more, and REM content of 0.0002% or more. The Ca content is very preferably 0.0004% or more, and very preferably 0.001% or more. The Mg content is preferably 0.0004% or more, and very preferably 0.001% or more. The Zr content is very preferably 0.0004% or more, and very preferably 0.001% or more. The REM content is very preferably 0.0004% or more, and very preferably 0.001% or more. It should be noted that REM is a general term for 17 elements, including Y, Se, and 15 lanthanide elements. One or more of these 17 elements may be present in steel. REM content refers to the total content of these elements.
[44] A rod-shaped steel product of the invention may contain at least one element selected from Pb, Se, Te, Bi, S and P as required, in addition to the aforementioned elements. Pb: 0 to 0.30% Se: 0 to 0.80% Te: 0 to 0.30% Bi: 0 to 0.50% S: 0 to 0.50% P: 0 to 0.30% Pb, Se, Te, Bi, S, and P may be included for machinability, as required. However, excessive content of any of Pb, Se, Te, Bi, S, and P reduces soft magnetic properties and toughness. For this reason, Pb is defined as 0.30% or less, Se as 0.80% or less, Te as 0.30% or less, Bi as 0.50% or less, S as 0.50% or less, and P as 0.30% or less. The Pb content is preferably 0.1% or less, and very preferably 0.05% or less. The Se content is preferably 0.1% or less, and very preferably 0.05% or less. The Te content is preferably 0.1% or less, and very preferably 0.05% or less. The Bi content is preferably 0.1% or less, and very preferably 0.05% or less. The sulfur content is preferably 0.1% or less, and very preferably 0.05% or less. The phosphorus content is preferably 0.1% or less, and very preferably 0.05% or less. On the other hand, to obtain the aforementioned effects, Pb of 0.0001% or more, Se of 0.0001% or more, Te of 0.0001% or more, Bi of 0.0001% or more, S of 0.0001% or more, and P of / enn ίη / ζζηζ / E / γίΛΐ 0.0001% or more is preferred. The Pb content is very preferably 0.0004% or more, and very preferably 0.001% or more. The Se content is very preferably 0.0004% or more, and very preferably 0.001% or more. The Te content is very preferably 0.0004% or more, and very preferably 0.001% or more. The Bi content is very preferably 0.0004% or more, and very preferably 0.001% or more. The S content is very preferably 0.0001% or more, and very preferably 0.0002% or more. The P content is very preferably 0.0004% or more, and very preferably 0.001% or more.
[45] F-value F-value: 20.0 or less An F-value is obtained using the following formula (a). The F-value is an index that shows whether the steel structure is close to a single ferrite phase during solidification or solution heat treatment. If the steel structure is close to a single ferrite phase, the number of columnar crystals in the molten steel increases. The fraction RD / / <100> During the oblique hot rolling described later, the F value increases, improving the soft magnetic properties. When the F value exceeds 20.0, it contains not only ferrite but also austenite and martensite. This decreases the RD fraction. <100> as well as soft magnetic properties. For this reason, the F-value is defined as 20.0% or less. The F-value is preferably 10.0% or less, preferably 0.0% or less, and most preferably -10.0% or less. Value F = 700C + 800N + 20Ni + 1OCu + 1OMn - 6.2Cr 9.2Si - 9.3Mo - 74.4Ti -37.2Al - 3.Inb + 63.2 (a) where the symbols of the elements in formula (a) mean contents (% by mass) of the respective elements in the steel.
[46] In a chemical composition of the steel product of the invention, the remainder consists of Fe and impurities. Impurities herein mean substances in raw materials such as ores and scrap, as well as components mixed in during the manufacturing process due to various factors when the steel product is manufactured industrially, the substances and components being permissible within a range that does not adversely affect the invention.
[47] Examples of impurities include O, Zn, and H. Impurities are preferably reduced; however, when contained, O, Zn, and H are desirably 0.01% or less. / enn ίη / ζζηζ / Β / γίΛΐ
[48] 4. Manufacturing method A favorable manufacturing method for a rod-shaped stainless steel product according to the invention will be described. The rod-shaped stainless steel product according to the invention can be reliably obtained according to, for example, a manufacturing method described below.
[49] For the rod-shaped stainless steel product according to the invention, steel having the chemical composition mentioned above is melted, the molten steel is cast into a molten steel having a predetermined diameter, and then the molten steel is subjected to hot bias rolling or warm bias rolling, as well as hot wire rolling or warm wire rolling. Subsequently, solution treatment, pickling, secondary working, and heat treatment are performed as required. / enn ίη / ζζηζ / Β / γίΛΐ
[50] 4-1. Skewed rolling step Heated molten steel is preferably hot-worked using bias rolling. Hot working is not limited to bias rolling. Any hot-working method that has undergone the same or a similar heat-processing history may be used. For example, roughing (breaking) may be used as long as it has undergone the same or a similar heat-processing history. In skew rolling, for example, as described in Patent Literature 4, three work rolls are arranged on respective roll shafts that are twisted and skewed in the same direction around a target material to be rolled, and each work roll rotates around the target material as it rotates, so that the target material is wound in a spiral shape as it advances. The columnar crystals in ferritic stainless steel are oriented <100> with respect to the direction of the radius of the steel product. <100> The columnar crystals can be oriented with respect to a rolling direction instead of the radius direction of the steel product by subjecting them to skew rolling.However, when the rolling time of the bias roll, during which the steel product is in contact with the three working rolls, is short, the <100> oriented with respect to the rolling direction forms randomly oriented recrystallized grains that do not have an orientation <100> through high-speed processing. The lamination time of skewed lamination thus changes the RD fraction / / <100> Additionally, the lamination time of skewed lamination changes the RD / / fraction <334> in a portion from a surface of the steel product to a position at a depth of 1 / 4 of the diameter of the steel product. For this reason, the rolling time of the skew roll affects the soft magnetic properties. When the skew rolling time is less than 0.10 s, the fraction RD / / <100> / enn Ln / zznz / B / YiAi decreases and the fraction RD / / <334> In the portion from the surface of the steel product to a depth of 1 / 4 inch, the diameter of the steel product increases. The soft magnetic properties are thus reduced. For this reason, the skew rolling time is 0.10 seconds or more, preferably 1 second or more, very preferably 10 seconds or more, and very preferably even 50 seconds or more. An excessively long skew rolling time decreases productivity, and therefore a time of 200 seconds or less is preferable. / enn ίη / ζζηζ / Β / γίΛΐ
[51] 4-2. Heat treatment temperature for steel bar and wire rod Steel bars and wire rod are preferably subjected to heat treatment after hot rolling. The heat treatment temperature for steel bars and wire rod changes the RD fraction. <100> , which affects the soft magnetic properties. When the heat treatment temperature for the steel bar and wire rod exceeds 1400 degrees C, an RD / / core <100> It does not grow, which reduces the fraction of RD / / <100> This reduces the soft magnetic properties. For this reason, the heat treatment temperature for steel bar and wire rod is 1400°C or lower, and preferably 1300°C or lower. The RD core / / <100> It does not grow when the heat treatment temperature for the steel bar and wire is below 500 degrees C. The heat treatment temperature for the steel bar and wire is therefore 500 degrees C or more.The heat treatment temperature for steel bar and wire rod is preferably 600°C or higher, very preferably 700°C, and very preferably still 800°C or higher. The RD fraction <334> It is also affected by the heat treatment temperature of the steel bar and wire rod. Therefore, a favorable range for the RD fraction can be determined. <334> adjusting the heat treatment temperature for the steel bar and wire rod in a range of 500 to 1400 degrees C along with any other manufacturing conditions. / enn ίη / ζζηζ / Β / γίΛΐ
[52] 4-3. Wire drawing rate Steel bars and wire rod that have been heat-treated after hot rolling are preferably subjected to wire drawing to form steel wire. The wire drawing speed changes the RD / / fraction <100> This affects the soft magnetic properties. When the wire drawing rate exceeds 50%, recrystallization is facilitated in a subsequent heat treatment to decrease the RD fraction. <100> This reduces the soft magnetic properties. The wire drawing speed is therefore 50% or less, preferably 30% or less, very preferably 15% or less, and very preferably still 5% or less. At a wire drawing speed of less than 0.01%, a core of RD / / <100> It does not grow in subsequent heat treatment. The drawing rate is therefore 0.01% or more.The drawing rate (%) is a percentage obtained by dividing the change in the cross-sectional area of the steel product before and after drawing by the cross-sectional area before drawing. The fraction RD / / <334> It is also affected by the drawing speed. Therefore, a favorable range for the RD fraction can be determined. <334> adjusting the drawing speed within a range of 0.01 to 50% along with any other manufacturing conditions. / enn ίη / ζζηζ / Β / γίΛΐ
[53] 4-4. Heat treatment temperature for steel wire Steel wire, after wire drawing, is preferably subjected to heat treatment. The heat treatment temperature for steel wire changes the RD / / fraction <100> , which affects the soft magnetic properties. When the heat treatment temperature for the steel wire exceeds 1400 degrees C, an RD / / core <100> It does not grow, decreasing the RD fraction / / <100> This reduces the soft magnetic properties. For this reason, the heat treatment temperature of the steel wire is 1400°C or lower, and preferably 1300°C or lower. The core of RD / / <100> It does not grow when the heat treatment temperature for steel wire is below 500 degrees C. The heat treatment temperature for steel wire is therefore 500 degrees C or higher.The heat treatment temperature for steel wire is preferably 600°C or higher, very preferably 700°C, and very preferably still 800°C or higher. The RD fraction <334> It is also affected by the heat treatment temperature of the steel wire. Therefore, a favorable range for the RD / / fraction can be determined. <334> adjusting the heat treatment temperature for the steel wire within a range of 500 to 1400 degrees C along with any other manufacturing conditions. / enn Ln / zznz / B / YiAi
[54] 5. Electromagnetic component Examples of an electromagnetic component using the rod-shaped stainless steel product of the invention include a core and connector of an injector and a solenoid valve. Since the rod-shaped steel product used as the material has excellent soft magnetic properties, it can provide effects such as improved magnetic attraction strength, reduced component diameter, and enhanced responsiveness.
[55] The invention is described more specifically below by means of examples, however, it is not limited to these examples. Example 1
[56] Steels having the chemical compositions shown in Tables 1 and 2 were melted. The AOD melting, which was an economical melting process for stainless steel, was assumed for the steel melting, where virtually every steel was melted in a 100 kg vacuum melting furnace and cast into molten steel with a diameter of 180 mm. The molten steel 1 was then transformed into a stainless steel bar or stainless steel wire with a diameter of 20.0 mm under the following manufacturing conditions. In Table 2 and Tables 4 to 6, the values of the chemical composition or the RD fraction / / <100> Those that fall outside the scope of the invention are underlined. In Tables 4 to 6, the values of the magnetic properties that are outside a favorable range of the invention are underlined. In Tables 5 and 6, the values of the manufacturing conditions that are outside a favorable range of the invention are underlined.
[57] The conditions are described below. / enn Ln / zznz / B / YiAi Specifically, the molten steel was heated and subjected to bias rolling for a rolling time of 3 s. Subsequently, annealing and rolling were performed to produce a steel bar or wire rod (rod-shaped steel product) with a diameter of 20.0 mm, and the heat treatment for the steel bar and wire rod was carried out at 900 degrees C. / enn Ln / zznz / B / YiAi
[58] Table Observaciones Valor F | -20.5 | | -20.0 | | -60.2 | | -46.1 | | -159.5 I 18.3 | I -71.8 | | -33.5 I LO cxí 1 | -241.7 | I -18.0 I | -145.0 | | -20.6 | I -31.5 | I I -2.2 | I 11.8 I I 14.3 | | -33.5 | I -43.1 | | -60.5 I | -41.9 | | -46.2 I | -56.7 | -52.8 Composición química (% en masa) Otros | Co:1.5 | | Sb:0.01 | O 0*1 d ó O | Sn:0.10 | | Pb:0.12 | I ΓΟΛ | | B:0.01 I δ d 03 O oro I 0.18 | | 0.22 I I 0.21 I I 0.20 I δ d | 0.04 | co d 0.21 | 0.02 1 | 00Ό | 0.11 | 2.00 | | 0.19 | I 00Ό I I 60Ό I I 00Ό I 1.37 I 1.94 | I 0.14 | 0.16 | 0.16 I | 90Ό | | 0.20 I δ d 80Ό Z 0.20 | 0.47 | | 90Ό 0.37 | 0.40 | 0-31 0.29 | 0.30 | lio 0.23 | | 00Ό 2.00 I co o d δ d 0.32 | 0.04 | 0.82 | O d O 0*1 d 0.12 | 0.10 0.19 I | 98Ό 0.49 | 0.31 | 0.39 < | 0.002 1 | 0.013 | | 0.018 I | 0.007 | I OLOO I 0.015 | 900Ό | | 0.017 | I 600Ό I | 0.004 | O o o I OLOO | I 8000 I | 0.013 | | 0.015 I | 0.018 | O o d o o o | 0.200 | | 0.002 I | 010Ό I | 0.016 I | 0.016 | | 0.005 | | 0.017 I 0.019 z 1 900Ό | I 600Ό I | eooo | I 800Ό | I 0.003 I | 0.003 | | 0.001 | I 600Ό | | 0.007 | 1 0900 I | 0.007 | | 8000 | | 0.003 | | 0.002 I I S000 | | 0.002 | | 0.029 | | 0.042 I | 0.044 | | 0.004 | | 0.005 I | 0.002 I | 600Ό | | 8000 | | 900Ό I 0.002 3 O 0.12 d 0.18 | 0.24 | I 0.32 | | 0.36 I O d LO 0*J d | 2.00 | OO 00 d | 0.30 | 0.25 | 0.36 | | 0.29 | | 80Ό | 0.34 0.81 1.90 1.90 0.18 | 0.28 I | 0.23 I | 0.02 | | 0.36 | | 0.24 | 0.29 Mo 1-19 0.31 1-43 O ó 1-40 1-34 0.14 I 00S | 1-43 0.77 o d I G9 0 I | 98’0 | 1-33 | 0.58 | 1-14 1-00 3-76 | 2.30 | 1.05 CO d 1-31 | 0.94 | 0.91 LO d 0.84 O 1 15.0 | 11.5 11.3 I 19.9 | I 19.5 | 35.0 | 6-0 co 14.9 19.0 ©0 d 14.0 11-0 811 16.0 I 10.7 | 21.0 6.5 O d 15.0 17.2 16-1 O d 13.9 LO d 16.9 z I 60Ό | I 60Ό I | 0.03 I | 90Ό | I 4.00 I | 80Ό | 0.19 δ d 1 S00 I | 0.42 | | 0.40 | I OS O I 0.14 0.37 0.12 I 0.17 | I 06Ό I | 3.80 I | 3.90 | | 0.36 | | 0.22 I | 0.22 | I 0.31 | I 80Ό I | 0.20 I d I 0.15 | 0.18 | 0.23 I | 2.00 | I 0.10 | 0.13 | 0.42 | | 0.03 | 0.34 «io*] d | 0.33 | | 0.38 | | 0.49 | 0.43 | 0.45 | | 0.05 | 1.90 1.80 I 1.90 I | 0.29 | 0.19 d I 0.12 I | 90° | LO d 0.15 o | 0.24 | d| 4.00 I| 0.28 | 1.40 0.47 | 2.00 | LO d 1 89Ό I LO ©0 d | 0.20 | | 0.22 | | 080 | | 0.24 | | 0.24 | co d | 60° | | 0.30 I oo | 0.38 | | 0.39 I 1-41 CXJ 1.49 | 0.84 I 1.30 o | 0.030 | I 1000 II 010Ε I | 0.007 | I 0.002 | | 0.007 II 600Ό II 900Ό | | 0.002 I| 0.007 | 00 ood I 800Ε | | 010 | | 0.003 | | 0.003 II 8000 I OO d d | 0.028 I| 0.029 | CO ood | ¿000 II 900Ό II 900Ό I | 0.004 I| 0.004 I δ od Tipo de acero < mo □ LU U_ 0 X — “0 ¡sí _l zo CL a cr 00 I- o > 5 XN Clasificación UOIOU3AU|. / enn in / zzh / B / yLi
[59] Tabla Observations Value F p δ 1 O δ 00 1 04 1 to lío ip δ 04 1 lo lo ip 5 1 Y p δ T 04 LÍO 1 OO δ oo 1 oo δ 04 1 lío δ <0 1 δ I OO Y o T ρ δ Ρ δ 04 1 M- 04 δ ο T ρ Τ en δ Ο δ ο T ρ δ οο 1 δ I £ 04 1 04 δ οο Chemical composition (% by mass) (Λ OO <o o o ó o | Te:0.01 | | ΡΌ.10 | | Se:0.001 I O o p m Sn:0.03 | 00 o ó £ δ ó ro 1- | Zr:0.007 | oo O o δ ώ 04 O o δ £ O O nj c S:0.20 1 i— 04 04 Ó O 04 δ 05 O δ O ó 05 O oo 04 O o δ 00 o δ 04 O oo δ oo δ lío o δ δ en 04 δ lío oo δ 00 δ lío 04 δ δ δ lío 04 δ <© 04 δ £ δ οο οο δ γ δ en 00 δ §1 οοΙ lío 04 δ É O ó <0 p o oo p o lo p ó oo 04 δ p δ LO δ p ó 03 δ 04 O 04 O £ o oo p δ ιο ρ δ oo P δ oo P δ ο ρ δ m ρ δ δ ρ δ δ 04 ρ δ 00 ρ δ ρ δ £ δ § οοΙ 00 ρ δ ο ρ δ < o ó I ΟΙΟΌ I | 0.004 1 G5 o ó <0 o o ó O o ó I 0.004 I lo o o ó en o ó LO δ ó 0.020 | <0 o δ 04 o o δ 04 LÍO o δ oo en o δ oo en o δ 04 ο δ δ δ ΙΛ <ο ο δ 0.£200 oo O o ó en O o ó oo oo 1 0.010 | en oo ó 05 O o ó <© oo δ oo δ lo o δ 0.020 | oo o d o d o d en o d O d o d o d o d o d o d I 1000Ο oo o d 04 o d 04 o d o 04 O d o £ ó oo 00 d oo oo d o 04 04 O oo oo eo O o 00 04 ó O oo oo d o ó oo 04 d o 04 d co δ LO <0 δ S δ δ S δ οο δ d <ο δ <ο | δ LO δ 04 <ο δ <ο LΙ0 d ο lío ΙΛ <ο δ 0 o <0 δ £ oo <© O Si o <o o o en ó 5 δ en o δ <© oo ó oo oo δ en Y o p p ρ LÍO ρ ΟΟ ρ §1 <ρ| ρ CP ρ ρ ρ Ρ οο ο ρ o 04 co p δ p δ p δ OO δ p δ p δ 00 p δ p δ δ P δ P δ ρ p δ p δ ρ ο δ 04 °ι οοΙ δ δ ρ δ ρ δ Γ- ρ δ F- ο δ z O δ o LÍO O en o o 04 δ 04 δ £ o en 04 o oo 00 o co o 04 04 O <© δ 04 δ o δ o δ o δ ίο δ R <ο δ 00 en δ οο en δ LO 03 δ 00 δ οο lío δ οο <ο δ δ 00 en δ ο ο δ έ o LO ó oo O O o ó <o o o 04 O oo O o o o O 04 04 O 04 Ó o δ CAJ δ oo δ CO 04 δ δ § col Ο δ LÍ0 00 δ CAJ οο δ <ο δ <ο οο δ 04 ο δ 05 δ ΟΟ 04 δ LO δ £ δ ιο 03 δ c / 5 σ>p <0 p £ O in oo o 04 04 O <O LO O 04 04 ^· o co O lo p OO LO O <© δ 04 o δ o p o| ρ δ| 00 ρ £ ρ 04 ο ρ δ en en <ο ρ δ οο δ δ ο δ ο 04 δ ο ρ o LO o o ó oo o o ó 04 O O ó | 0.01 ο δ ο δ ο δ ο δ ο δ ο δ ο ο δ Type of steel < o < Q Ll—I < < o X < < “3 —1 < 2 < o □_ σ IX < < I— < > < / enn ίη / ζζηζ / Β / γίΛΐ
[60] The RD fraction was measured / / <100> , the fraction RD / / <334> and the soft magnetic properties for the steel bars and wire obtained (rod-shaped steel products). The results are shown collectively in Tables 3 and 4 below. The measurements were performed according to the following procedure.
[61] Table 3 Classification No. Steel Type Fraction RD / / <100> RD Fraction / / <334> DC magnetic properties at 5Oe T AC magnetic properties at 10Oe-2kHz T Invention 1 A 0.28 0.06 0.73 0.27 2 B 0.27 0.08 0.79 0.21 3 C 0.25 0.09 0.71 0.22 4 D 0.27 0.08 0.58 0.21 5 E 0.40 0.09 0.61 0.29 6 F 0.33 0.10 0.58 0.26 7 G 0.27 0.08 0.66 0.30 8 H 0.37 0.07 0.64 0.27 9 I 0.27 0.09 0.66 0.24 10 J 0.24 0.05 0.67 0.23 11 K 0.25 0.06 0.73 0.24 12 L 0.35 0.07 0.67 0.21 13 M 0.38 0.08 0.75 0.30 14 N 0.57 0.02 1.21 0.74 15 0 0.62 0.02 1.05 0.46 16 P 0.70 0.05 1.20 0.80 17 Q 0.15 0.07 0.41 0.15 18 R 0.08 0.14 0.16 0.08 19 S 0.07 0.19 0.15 0.07 20 T 0.53 0.04 1.01 0.60 21 u 0.43 0.02 0.85 0.40 22 V 0.80 0.05 1.35 1.00 23 w 0.38 0.03 0.65 0.28 24 0.04 0.60 0.25 26 z 0.22 0.04 0.62 0.25
[62] Table 4 Classification No. Steel Type Fraction RD / / <100> RD Fraction / / <334> DC magnetic properties at 5Oe T AC magnetic properties at 10Oe-2kHz T Invention 27 AA 0.22 0.05 0.69 0.28 28 AB 0.28 0.02 0.61 0.29 29 AC 0.30 0.04 0.54 0.26 30 AD 0.28 0.04 0.54 0.24 31 AE 0.20 0.01 0.58 0.25 32 AF 0.25 0.05 0.59 0.24 33 AG 0.26 0.03 0.77 0.29 34 AH 0.32 0.05 0.79 0.24 35 AI 0.25 0.02 0.53 0.25 36 AJ 0.37 0.03 0.67 0.28 37 AK 0.21 0.02 0.60 0.22 38 AL 0.24 0.01 0.68 0.25 39 AM 0.36 0.03 0.77 0.23 Product for comparison 40 AN 0.01 0.20 0.05 0.03 41 A 0 0.02 0.22 0.08 0.04 42 AP 0.02 0.23 0.00 0.03 43 AQ 0.02 0.24 0.01 0.03 44 AR 0.03 0.28 0.08 0.01 45 AS 0.03 0.20 0.08 0.03 46 AT 0.04 0.26 0.07 0.03 47 AU 0.02 0.22 0.09 0.02 48 AV 0.02 0.29 0.09 0.04 49 AW 0.03 0.28 0.02 0.03 50 AX 0.01 0.26 0.04 0.02 51 AY 0.03 0.23 0.01 0.02 52 AZ 0.02 0.25 0.06 0.04 53 BA 0.02 0.25 0.05 0.01 54 BB 0.03 0.26 0.01 0.03
[63] The RD fraction / / <100> This was obtained by measuring at least one field of view at 200x magnification on each of a portion of the surface layer, a core portion, and a 1 / 4 depth position existing between the surface layer portion and the core portion in an L-shaped cross-section of a wire. One crystal orientation of each crystal grain in the observed fields of view was analyzed using FE-SEM / EBSD. The rolling direction was represented by RD. One plane of the crystal was analyzed in the RD direction. The components were unfurled in one orientation <001> only in a clearance of 25 degrees or less (a glass that had an orientation difference of 25 degrees or less between the orientation <100> and the lamination direction) and the RD fraction was measured / / <100> (area ratio (-) ) (an average of the surface layer portion, the middle portion and the 1 / 4 depth position).
[64] The RD fraction / / <334> This was obtained by measuring at least one field of view at 200x magnification at a depth of 1 / 8 of the wire rod, located between a surface and a depth of 1 / 4 of the wire rod diameter, in an L-shaped cross-section of the wire rod. The crystal orientation of each crystal grain in the observed fields of view was analyzed using FESEM / EBSD. The rolling direction was represented by RD. A plane of the crystal was analyzed in the RD direction. The components were unfurled in an orientation <334> only in a clearance of 10 degrees or less and the RD fraction was measured / / <334> (area ratio (-) ) (at a position at a depth of 1 / 8 of the wire rod diameter from the / enn ίη / ζζηζ / Β / γίΛΐ surface of the same).
[65] A magnetic flux density (T) at 5 Oe was measured for the direct current (DC) magnetic properties. A ring-shaped test piece with a thickness of 3 mm x 10 mm outer diameter x 8 mm inner diameter was prepared and subjected to heat treatment at 900°C for 2 hours. The magnetic flux density at 5 Oe was then measured. A relationship between RD / / <100> and the magnetic properties by processing the test piece such that the rolling direction was parallel to the diameter direction of the ring-shaped test piece. Samples were taken from similarly prepared test pieces. A magnetic flux density of 0.1 T or more was considered favorable.
[66] The ring-shaped test piece was subjected to heat treatment at 900 degrees C for 2 hours, and a maximum magnetic flux density (T) at 2 kHz and 10 Oe was measured for alternating current (AC) magnetic properties. A maximum magnetic flux density of 0.05 T or more was evaluated as favorable.
[67] Nos. 1 to 39 met the requirements of the invention, exhibiting favorable soft magnetic properties. Nos. 40 to 55 did not meet the requirements of the invention, exhibiting unfavorable soft magnetic properties. Example 2
[68] Subsequently, rod-shaped steel products with a diameter of 15 mm were prepared using a type of steel Q shown in Table 1 under the conditions shown in Table 5. Any other history other than the rolling time of the bias roll was the same as in Example 1. The fraction RD / / <100> , the RD fraction / / <334> and the soft magnetic properties for the prepared steel bars and wire (steel products in the form of a 10-rod) using the methods described above. The results are shown collectively in Table 5 below.
[69] Table 5 Classification No. Steel Type Skewed Rolling Time s Fraction RD / / <100> RD Fraction / / <334> DC magnetic properties at 5Oe T AC magnetic properties at 10Oe-2kHz T Invention 109 Q 200.0 0.88 0.03 1.30 0.90 110 0.10 0.06 0.11 0.12 0.08 111 140 0.66 0.04 1.18 0.79 112 178 0.93 0.01 1.18 0.31 113 53 0.48 0.01 1.20 0.94 114 30 0.32 0.07 0.65 0.29 115 22 0.24 0.06 0.65 0.22 116 18 0.34 0.07 0.61 0.23 117 9 0.14 0.17 0.48 0.14 118 5 0.17 0.11 0.47 0.12 119 0.4 0.09 0.17 0.18 0.09 120 0.2 0.06 0.22 0.28 0.06 Product for comparison 121 Q 0.08 0.01 0.24 0.03 0.01 122 0.09 0.03 0.25 0.09 0.03 123 0.03 0.03 0.22 0.06 0.02
[70] Nos. 109 to 120 met the favorable requirements of the invention, exhibiting favorable soft magnetic properties. Nos. 121 to 123 did not meet the favorable requirements of the invention, exhibiting unfavorable soft magnetic properties. Example 3
[71] Subsequently, steel of type P, shown in Table 1, was used to prepare cast steel. The prepared cast steel was heated and subjected to bias rolling for 50 s. Annealing and rolling then took place to produce steel bars and wire rod of varying diameters. Heat treatment of the steel bars and wire rod, wire drawing, and heat treatment of the steel wire were then performed under the conditions shown in Table 6 to prepare steel wires (rod-shaped steel products) with a diameter of 20 mm. The fraction RD / / <100> , the RD fraction / / <334> The soft magnetic properties of the prepared steel wires (rod-shaped steel products) were measured using the methods described above. The results are collectively shown in Table 6 below. AC magnetic properties at 10Oe-2kHz T 0.26 0.27 0.22 0.25 0.23 0.25 0.94 0.98 0.94 0.26 0.21 ^F Ó 0.19 O o 0.05 εοο 0.03 0.03 0.04 0.02 0.02 DC magnetic properties at 5Oe T 0.56 0.70 99Ό 0.53 0.52 69Ό 1.06 98Ό O 0.79 69Ό CO ó 0.43 0.11 0.14 0.05 0.07 90Ό 0.05 80Ό 90Ό Fraction RD / / <334> oto 90Ό 60Ό 90Ό 0.05 90Ό SO'O 'd· o O oo 90Ό 60Ό ó 0.16 LO Ó 0.23 0.25 CM Ó 0.25 0.29 0.26 cí ó Fraction RD / / <100> 0.39 0.23 0.40 0.34 0.28 0.31 oso 8 SO 0.78 0.39 0.20 0.17 0.20 O o CO OO 0.02 0.02 0.02 LOO LOO 0.02 Heat treatment temperature for steel wire °C co 738 789 794 1400 500 1281 CO co o 924 719 796 644 639 580 525 1052 1251 1274 O co o T- 1500 400 Wire drawing speed % o LO O LO 0.01 τι— CO 0.3 CO LQ O 1— CO OJ LO OJ LO 'xF ^FO °loo ó LO LO Heat treatment temperature for steel bar and wire rod °C 1400 oo LO 713 700 763 763 1275 1136 805 796 722 621 627 589 515 1500 400 932 820 961 1155 Steel type CL CL Ó 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 Classification UOIOUSAUI uoioejedwoo ejed oionpojd.
[73] Nos. 124 to 138 met the favorable requirements of the invention, exhibiting favorable soft magnetic properties. Nos. 139 to 144 did not meet the favorable requirements of the invention, exhibiting unfavorable soft magnetic properties.
[74] In accordance with the invention, a rod-shaped steel product can be obtained that has excellent soft magnetic properties and is extremely useful in industry.
Claims
1. A rod-shaped stainless steel product comprising a chemical composition comprising: by mass %, 0.001 to 0.030% C, 0.01 to 4.00% Si, 0.01 to 2.00% Mn, 0.01 to 4.00% Ni, 6.0 to 35.0% Cr, 0.01 to 5.00% Mo, 0.01 to 2.00% Cu, 0.001 to 0.050% N, 0 to 2.00% Ti, 0 to 2.00% Nb, 0 to 2.0% V, 0 to 0.1% B, 0 to 7.000% Al, 0 to 3.0% W, 0 to 0.05% Ga, 0 to 2.5% Co, 0 to 2.5% Sn, 0 to 2.5% Sb, 0 to 2.5% Ta, 0 to 0.05% Ca, 0 to 0.012% Mg, 0 to 0.012% Zr, 0 to 0.05% REM, 0 to 0.30% Pb, 0 to 0.80% Se, 0 to 0.30% Te, 0 to 0.50% Bi, 0 to 0.50% S, and 0 to 0.30% P, a remainder consisting of Fe and impurities, an F value shown in formula (a) below being 20 or less, a fraction of crystal orientation in the rolling direction RD / / <100> of the stainless steel rod-shaped product that is 0.0.5 or more, the fraction of the glass orientation in the lamination direction RD / / <100> It means a glass area ratio that has 25 degrees or less of an orientation difference between an orientation <100> and a rolling direction, F value = 700C + 800N + 20Ni + 1OCu + 1OMn - 6.2Cr 9.2Si - 9.3Mo - 74.4Ti - 37.2A1 - 3.Inb + 63.2 (a) where the symbols of the elements in formula (a) mean contents (% by mass) of the respective elements in the steel.
2. The rod-shaped stainless steel product according to claim 1, wherein in the chemical composition, in % by mass, Si is 3.00% or less and Al is 3.000% or less, a fraction of the crystal orientation in the rolling direction RD / / <334> is 0.2 or less in a position that has a depth of 1 / 8 of the diameter of the steel product from a surface of the steel product, the fraction of glass orientation in the rolling direction RD / / <334> meaning a glass area ratio that has 10 degrees or less of an orientation difference between an orientation <334> and a lamination direction, and the fraction of the glass orientation in the lamination direction RD / / <100> is 0.62 or more.
3. The rod-shaped stainless steel product according to claim 1, wherein the chemical composition further comprises, in % by mass, at least one selected from 0.001 to 2.00% Ti, 0.001 to 2.00% Nb, 0.001 to 2.0% V, 0.0001 to 0.1% B, 0.001 to 3.000% Al, 0.05 to 3.0% W, 0.0004 to 0.05% Ga, 0.05 to 2.5% Co, 0.01 to 2.5% Sn, 0.01 to 2.5% Sb and 0.01 to 2.5% Ta.
4. The rod-shaped stainless steel product according to claim 2, wherein the chemical composition further comprises, in % by mass, at least one selected from 0.001 to 2.00% Ti, 0.001 to 2.00% Nb, 0.001 to 2.0% V, 0.0001 to 0.1% B, 0.001 to 3.000% Al, 0.05 to 3.0% W, 0.0004 to 0.05% Ga, 0.05 to 2.5% Co, 0.01 to 2.5% Sn, 0.01 to 2.5% Sb and 0.01 to 2.5% Ta.
5. The rod-shaped stainless steel product according to claim 1, wherein the chemical composition further comprises, in % by mass, at least one selected from 0.0002 to 0.05% Ca, 0.0002 to 0.012% Mg, 0.0002 to 0.012% Zr and 0.0002 to 0.05% REM.
6. The rod-shaped stainless steel product according to claim 2, wherein the chemical composition further comprises, in % by mass, at least one selected from 0.0002 to 0.05% Ca, 0.0002 to 0.012% Mg, 0.0002 to 0.012% Zr and 0.0002 to 0.05% REM.
7. The rod-shaped stainless steel product according to claim 3, wherein the chemical composition further comprises, in % by mass, at least one selected from 0.0002 to 0.05% Ca, 0.0002 to 0.012% Mg, 0.0002 to 0.012% Zr and 0.0002 to 0.05% REM.
8. The rod-shaped stainless steel product according to claim 4, wherein the chemical composition further comprises, in % by mass, at least one selected from 0.0002 to 0.05% Ca, 0.0002 to 0.012% Mg, 0.0002 to 0.012% Zr and 0.0002 to 0.05% REM.
9. The rod-shaped stainless steel product according to any one of claims 1 to 8, wherein the chemical composition further comprises, in % by mass, at least one selected from 0.0001 to 0.30% Pb, 0.0001 to 0.80% Se, 0.0001 to 0.30% Te, 0.0001 to 0.50% Bi, 0.0001 to 0.50% S, and 0.0001 to 0.30% P.
10. The rod-shaped stainless steel product according to any of claims 1 to 8, comprising a magnetic flux density of 0.10 T or more at 5 Oe.
11. The rod-shaped stainless steel product according to claim 9, comprising a magnetic flux density of 0.10 T or more at 5 Oe.
12. The rod-shaped stainless steel product according to any of claims 1 to 8, comprising a maximum magnetic flux density of 0.05 T or more at 10 Oe and an alternating current frequency of 2 kHz.
13. The rod-shaped stainless steel product according to claim 9, comprising a maximum magnetic flux density of 0.05 T or more at 10 Oe and an alternating current frequency of 2 kHz.
14. The rod-shaped stainless steel product according to claim 10, comprising a maximum magnetic flux density of 0.05 T or more at 10 Oe and an alternating current frequency of 2 kHz.
15. The rod-shaped stainless steel product according to claim 11, comprising a maximum magnetic flux density of 0.05 T or more at 10 Oe and an alternating current frequency of 2 kHz.
16. An electromagnetic component using the rod-shaped stainless steel product according to any of claims 1 to 8.
17. An electromagnetic component using the rod-shaped stainless steel product according to claim 9.
18. An electromagnetic component using the rod-shaped stainless steel product according to claim 10.
19. An electromagnetic component using the rod-shaped stainless steel product according to claim 11.
20. An electromagnetic component using the rod-shaped stainless steel product according to claim 12.
21. An electromagnetic component using the rod-shaped stainless steel product according to claim 13.
22. An electromagnetic component using the rod-shaped stainless steel product according to claim 14.
23. An electromagnetic component using the rod-shaped stainless steel product according to claim 15.
24. The rod-shaped stainless steel product according to claim 1, wherein the chemical composition further comprises, in % by mass, at least one selected from 0.001 to 2.00% Ti, 0.001 to 2.00% Nb, 0.001 to 2.0% V, 0.0001 to 0.1% B, 0.001 to 7.000% Al, 0.05 to 3.0% W, 0.0004 to 0.05% Ga, 0.05 to 2.5% Co, 0.01 to 2.5% Sn, 0.01 to 2.5% Sb, and 0.01 to 2.5% Ta.
25. The rod-shaped stainless steel product according to claim 24, wherein the chemical composition further comprises, in % by mass, at least one selected from 0.0002 to 0.05% Ca, 0.0002 to 0.012% Mg, 0.0002 to 0.012% Zr, and 0.0002 to 0.05% REM.
26. The rod-shaped stainless steel product according to claim 24 or 25, wherein the chemical composition further comprises, in % by mass, at least one selected from 0.0001 to 0.30% Pb, 0.0001 to 0.80% Se, 0.0001 to 0.30% Te, 0.0001 to 0.50% Bi, 0.0001 to 0.50% S, and 0.0001 to 0.30% P.