Classifications

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  • C22C—ALLOYS
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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  • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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  • C22C—ALLOYS
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  • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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  • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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  • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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  • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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  • C22C—ALLOYS
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  • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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  • C22C—ALLOYS
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
  • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
  • H01F1/147—Alloys characterised by their composition
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
  • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
  • H01F1/147—Alloys characterised by their composition
  • H01F1/14766—Fe-Si based alloys
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D6/00—Heat treatment of ferrous alloys
  • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D6/00—Heat treatment of ferrous alloys
  • C21D6/005—Heat treatment of ferrous alloys containing Mn
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D6/00—Heat treatment of ferrous alloys
  • C21D6/007—Heat treatment of ferrous alloys containing Co
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D6/00—Heat treatment of ferrous alloys
  • C21D6/008—Heat treatment of ferrous alloys containing Si
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/06—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
  • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
  • C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C2202/00—Physical properties
  • C22C2202/02—Magnetic

Definitions

• the present invention relates to an electromagnetic stainless rod-shaped steel material, particularly a stainless steel rod-shaped steel material having excellent soft magnetic properties, and an electromagnetic component using the same.
• solenoid stainless steel products such as solenoid valves have been manufactured by processing, molding, and heat-treating ferritic stainless steel wires and steel wires such as SUS430 and SUS410L.
• the soft magnetic properties of stainless steel products processed and manufactured from the above-mentioned ferritic stainless steel wire rods cannot sufficiently correspond to high-precision and high-output parts, and have a drawback that their applications are limited.
• techniques for optimizing alloying elements such as Cr, Si, and Al have been studied to improve soft magnetic properties (for example, Patent Documents 1 to 3), but they are assembled by combining components and processes. There is no invention that focuses on improving the soft magnetic properties of ferritic stainless steel rods by utilizing structure control.
• Japanese Unexamined Patent Publication No. 6-49606 Japanese Unexamined Patent Publication No. 6-49605 Japanese Unexamined Patent Publication No. 2004-307979 Japanese Unexamined Patent Publication No. 05-329510
• an object of the present invention is to solve the above problems and to provide a stainless steel rod-shaped steel material having excellent soft magnetic properties and an electromagnetic component using the same.
• the present invention has been made to solve the above problems, and the gist of the present invention is the following stainless steel rod-shaped steel materials and electromagnetic parts.
• the chemical composition is mass%. C: 0.001 to 0.030%, Si: 0.01-4.00%, Mn: 0.01-2.00%, Ni: 0.01-4.00%, Cr: 6.0 to 35.0%, Mo: 0.01-5.00%, Cu: 0.01-2.00%, N: 0.001 to 0.050%, Ti: 0-2.00%, Nb: 0 to 2.00%, V: 0-2.0%, B: 0-0.1%, Al: 0 to 7,000%, W: 0-3.0%, Ga: 0-0.05%, Co: 0-2.5%, Sn: 0-2.5%, Sb: 0-2.5%, Ta: 0-2.5%, Ca: 0-0.05%, Mg: 0 to 0.012%, Zr: 0 to 0.012%, REM: 0-0.05%, Pb: 0 to 0.30%, Se: 0 to 0.80%, Te: 0
• the crystal orientation RD // ⁇ 100> fraction in the rolling direction means the area ratio of the crystal in which the angle difference between the ⁇ 100> orientation and the rolling direction is 25 ° or less.
• F value 700C + 800N + 20Ni + 10Cu + 10Mn-6.2Cr-9.2Si-9.3Mo-74.4Ti-37.2Al-3.1Nb + 63.2 ...
• each element symbol in the formula means the content (mass%) of each element in steel.
• the chemical composition is further increased by mass%.
• Ta: 0.01-2.5% Contains one or more selected from, The stainless steel rod-shaped steel material according to [1] or [2].
• the chemical composition is further increased by mass%.
• the chemical composition is further increased by mass%.
• Pb 0.0001 to 0.30%
• Se 0.0001 to 0.80%
• Te 0.0001 to 0.30%
• Bi 0.0001 to 0.50%
• S 0.0001 to 0.50%
• P 0.0001 to 0.30%
• a stainless rod-shaped steel material and an electromagnetic component having excellent soft magnetic properties can be obtained.
• the present inventors conducted various studies in order to obtain stainless steel rod-shaped steel materials and electromagnetic parts having excellent soft magnetic properties. As a result, the following findings (a) to (c) were obtained.
• the crystal orientation RD // ⁇ 100> fraction in the steel wire rolling direction can be increased.
• the crystal orientation RD // ⁇ 334> fraction in the steel wire rolling direction between the surface and the depth of 1/4 of the diameter can be reduced.
• the crystal orientation in the rolling direction (RD) is controlled.
• the crystal orientation RD // ⁇ 100> fraction (area ratio) in the rolling direction (hereinafter, simply referred to as "RD // ⁇ 100>fraction”) is set to 0.05 or more. This is because when the RD // ⁇ 100> fraction is less than 0.05, the soft magnetic characteristics deteriorate.
• the RD // ⁇ 100> fraction is more preferably 0.10 or more, further preferably 0.20 or more, and even more preferably 0.40 or more.
• the RD // ⁇ 100> fraction is calculated using the following procedure. Specifically, the RD // ⁇ 100> fraction exists in the surface layer portion, the central portion, and between the surface layer portion and the central portion in the L cross section (cross section parallel to the longitudinal direction of the steel material) of the rod-shaped steel material. At the 1/4 depth position, one or more visual fields are measured with a 200-fold visual field. Then, the crystal orientation of each crystal grain in the observation field of view is analyzed using FE-SEM / EBSD. The rolling direction is RD, the crystal plane in the RD direction is analyzed, the directional component of ⁇ 100> is displayed only in the portion within the clearance of 25 °, and the RD // ⁇ 100> fraction is measured.
• the surface layer portion refers to a position having a depth of 1 mm from the surface in the central axis direction. That is, the crystal orientation RD // ⁇ 100> fraction in the rolling direction is the area ratio of crystals in which the angle difference between the ⁇ 100> orientation and the rolling direction is 25 ° or less (surface layer portion, center portion, 1/4 depth). It means the average of the rolling position).
• the bar-shaped steel material according to the present invention preferably controls the crystal orientation that deteriorates the soft magnetic properties in the rolling direction (RD).
• the crystal orientation RD // ⁇ 334> fraction in the bar rolling direction at a depth of 1/8 of the diameter from the surface is preferably 0.20 or less.
• the crystal orientation RD // ⁇ 334> fraction (area ratio) in the rolling direction (hereinafter simply referred to as "RD // ⁇ 334>fraction”) is set to 0.20 or less. This is because when the RD // ⁇ 334> fraction exceeds 0.2, the soft magnetic characteristics deteriorate.
• the RD // ⁇ 334> fraction is more preferably 0.10 or less, and even more preferably 0.05 or less.
• the RD // ⁇ 334> fraction is calculated using the following procedure. Specifically, the RD // ⁇ 334> fraction is a 1/8 depth between the surface and the 1/4 depth position of the diameter in the L cross section of the rod-shaped steel material (cross section parallel to the longitudinal direction of the steel material). In the position part, one or more visual fields are measured with a 200-fold visual field. Then, the crystal orientation of each crystal grain in the observation field of view is analyzed using FE-SEM / EBSD. The rolling direction is RD, the crystal plane in the RD direction is analyzed, the directional component of ⁇ 334> is displayed only in the portion within the clearance of 10 °, and the RD // ⁇ 334> fraction is measured.
• the crystal orientation RD // ⁇ 334> fraction in the rolling direction is the area ratio of the crystal in which the angle difference between the ⁇ 334> orientation and the rolling direction is 10 ° or less (1/8 depth position from the surface to the diameter). Part) means.
• C 0.001 to 0.030% C increases the strength of the steel material. Therefore, the C content is set to 0.001% or more. However, if C is excessively contained, the soft magnetic properties deteriorate. Therefore, the C content is set to 0.030% or less.
• the C content is preferably 0.020% or less, more preferably 0.015% or less, and even more preferably 0.010% or less.
• Si 0.01-4.00% Si is contained as a deoxidizing element to improve high-temperature oxidation characteristics and AC magnetic characteristics. Therefore, the Si content is preferably 0.01% or more, preferably 0.10% or more. However, if Si is contained in an excessive amount, the soft magnetic properties deteriorate. Therefore, the Si content is set to 4.00% or less. The Si content is preferably 3.00% or less, more preferably 1.50% or less.
• Mn 0.01-2.00% Mn improves the strength and AC magnetic properties of the steel material. Therefore, the Mn content is preferably 0.01% or more, preferably 0.05% or more. However, if Mn is excessively contained, the soft magnetic properties are deteriorated. In addition, corrosion resistance may decrease. Therefore, the Mn content is set to 2.00% or less. The Mn content is preferably 1.00% or less, and more preferably 0.50% or less.
• Ni 0.01-4.00% Ni improves the toughness of steel materials. Therefore, the Ni content is preferably 0.01% or more, preferably 0.05% or more. However, if Ni is excessively contained, the soft magnetic properties are deteriorated. Therefore, the Ni content is set to 4.00% or less. The Ni content is preferably 3.00% or less, more preferably 1.00% or less, and even more preferably 0.50% or less.
• the Cr content is set to 6.0% or more.
• the Cr content is preferably 7.0% or more, and more preferably 10.0% or more. However, if Cr is excessively contained, the soft magnetic properties are deteriorated.
• the Cr content should be 35.0% or less.
• the Cr content is preferably 21.0% or less, and more preferably 20.0% or less.
• Mo 0.01-5.00% Mo improves corrosion resistance and AC magnetic properties. Therefore, the Mo content is set to 0.01% or more. However, if Mo is contained in an excessive amount, the soft magnetic properties are deteriorated. Therefore, the Mo content is set to 5.00% or less.
• the Mo content is preferably 3.00% or less, more preferably 2.00% or less, and even more preferably 1.50% or less.
• Cu 0.01-2.00% Cu improves corrosion resistance and AC magnetic properties. Therefore, the Cu content is preferably 0.01% or more, preferably 0.05% or more. However, if Cu is contained in excess, the soft magnetic properties are deteriorated. Therefore, the Cu content is set to 2.00% or less. The Cu content is preferably 1.00% or less, more preferably 0.80% or less, and even more preferably 0.40% or less.
• N 0.001 to 0.050% N improves the strength of the steel material. Therefore, the N content is preferably 0.001% or more, and preferably 0.002% or more. However, if N is excessively contained, the soft magnetic properties are deteriorated. Therefore, the N content is set to 0.050% or less. The N content is preferably 0.040% or less, more preferably 0.020% or less, and even more preferably 0.010% or less.
• the rod-shaped steel material according to the present invention contains, if necessary, one or more elements selected from Ti, Nb, V, B, Al, W, Ga, Co, Sn, Sb and Ta in addition to the above elements. You may.
• Ti 0 to 2.00% Ti has the effect of increasing the strength of the steel material. Further, since Ti forms a carbonitride, it suppresses the formation of Cr carbides and suppresses the formation of a Cr-deficient layer. As a result, it has the effect of preventing intergranular corrosion. That is, since Ti has an effect of improving corrosion resistance, it may be contained if necessary. Further, it is an element that enhances soft magnetic properties by fixing C and N by forming Ti carbonitride. However, if Ti is excessively contained, the soft magnetic properties are deteriorated. In addition, the toughness is reduced by the coarse carbonitride. Therefore, the Ti content is set to 2.00% or less.
• the Ti content is preferably 1.00% or less, more preferably 0.50% or less, further preferably 0.50% or less, and even more preferably 0.25% or less. On the other hand, in order to obtain the above effect, the Ti content is preferably 0.001% or more.
• Nb 0 to 2.00%
• Nb has the effect of increasing the strength of the steel material. Further, since Nb forms a carbonitride, it suppresses the formation of Cr carbides and suppresses the formation of a Cr-deficient layer. As a result, Nb has an effect of preventing intergranular corrosion. That is, since Nb is an element effective for improving corrosion resistance, it may be contained as necessary. Further, it is an element that enhances soft magnetic properties by fixing C and N by forming Nb carbonitride. However, if Nb is excessively contained, the soft magnetic properties are deteriorated. In addition, the toughness is reduced by the coarse carbonitride. Therefore, the Nb content is set to 2.00% or less. The Nb content is preferably 1.00% or less, more preferably 0.80% or less, and even more preferably 0.60% or less. On the other hand, in order to obtain the above effect, the Nb content is preferably 0.001% or more.
• V 0-2.0% Since V has an effect of improving corrosion resistance, it may be contained if necessary. However, if V is excessively contained, the soft magnetic properties are deteriorated. In addition, the toughness is reduced by the coarse carbonitride. Therefore, the V content is set to 2.0% or less. The V content is preferably 1.0% or less, more preferably 0.5% or less, and even more preferably 0.1% or less. On the other hand, in order to obtain the above effect, the V content is preferably 0.001% or more.
• B 0-0.1% B has the effect of improving hot workability and corrosion resistance. Therefore, it may be contained as needed. However, if B is contained in an excessive amount, the soft magnetic properties are deteriorated. Therefore, the B content is set to 0.1% or less.
• the B content is preferably 0.02% or less, more preferably 0.01% or less.
• the B content is preferably 0.0001% or more.
• Al 0 to 7,000% Al may be contained if necessary because it has the effect of promoting deoxidation and improving the cleanliness level of inclusions.
• the addition of Al enhances the AC magnetic properties.
• the Al content is set to 7,000% or less.
• the Al content is preferably 3.000% or less, more preferably 0.100% or less, and even more preferably 0.020% or less.
• the Al content is preferably 0.001% or more.
• W 0-3.0% Since W has an effect of improving corrosion resistance, it may be contained if necessary. However, if W is excessively contained, the soft magnetic property is deteriorated. In addition, the toughness is reduced by the coarse carbonitride. Therefore, the W content is set to 3.0% or less. The W content is preferably 2.0% or less, more preferably 1.5% or less. On the other hand, in order to obtain the above effect, the W content is preferably 0.05% or more, and more preferably 0.10% or more.
• Ga 0-0.05% Since Ga has an effect of improving corrosion resistance, it may be contained if necessary. However, if Ga is excessively contained, the hot workability is lowered. Therefore, the Ga content is set to 0.05% or less. On the other hand, in order to obtain the above effect, the Ga content is preferably 0.0004% or more.
• Co 0-2.50% Since Co has an effect of improving the strength of the steel material, it may be contained if necessary. In addition, the addition of an appropriate amount of Co increases the saturation magnetic flux density, thus enhancing the soft magnetic characteristics. However, if Co is excessively contained, the soft magnetic properties are deteriorated. Therefore, the Co content is set to 2.50% or less.
• the Co content is preferably 1.00% or less, and more preferably 0.80% or less.
• the Co content is preferably 0.05% or more, and more preferably 0.10% or more.
• Sn 0 to 2.50% Sn has an effect of improving soft magnetic properties, corrosion resistance, and machinability, and may be contained as necessary. However, if Sn is contained in an excessive amount, the soft magnetic properties are deteriorated. In addition, the toughness decreases due to the grain boundary segregation of Sn. Therefore, the Sn content is set to 2.50% or less.
• the Sn content is more preferably 1.00% or less, and further preferably 0.20% or less.
• the Sn content is preferably 0.01% or more, and more preferably 0.05% or more.
• Sb 0-2.5% Since Sb has an effect of improving corrosion resistance, it may be contained if necessary. However, if Sb is excessively contained, the soft magnetic properties are deteriorated. Therefore, the Sb content is set to 2.5% or less. The Sb content is more preferably 1.0% or less, and further preferably 0.2% or less. On the other hand, in order to obtain the above effect, the Sb content is preferably 0.01% or more, and more preferably 0.05% or more.
• Ta 0-2.5% Since Ta has an effect of improving corrosion resistance, it may be contained if necessary. However, if Ta is excessively contained, the soft magnetic properties are deteriorated. Therefore, the Ta content is set to 2.5% or less. The Ta content is preferably 1.5% or less, more preferably 0.9% or less. On the other hand, in order to obtain the above effect, the Ta content is preferably 0.01% or more, more preferably 0.04% or more, and further preferably 0.08% or more.
• the rod-shaped steel material according to the present invention may contain one or more elements selected from Ca, Mg, Zr, and REM, if necessary.
• Ca, Mg, Zr, and REM may be contained, if necessary, for deoxidation. However, if each of these elements is contained in excess, the soft magnetic properties deteriorate. Also, the toughness is reduced by the coarse inclusions. Therefore, Ca: 0.05% or less, Mg: 0.012% or less, Zr: 0.012% or less, REM: 0.05% or less.
• the Ca content is preferably 0.010% or less, more preferably 0.005% or less.
• the Mg content is preferably 0.010% or less, more preferably 0.005% or less.
• Zr is preferably 0.010% or less, and more preferably 0.005% or less.
• the REM is preferably 0.010% or less.
• the Ca content is more preferably 0.0004% or more, and further preferably 0.001% or more.
• the Mg content is preferably 0.0004% or more, and more preferably 0.001% or more.
• the Zr content is more preferably 0.0004% or more, and even more preferably 0.001% or more.
• the REM content is more preferably 0.0004% or more, and even more preferably 0.001% or more.
• REM is a general term for 17 elements including 15 elements of lanthanoids and Y and Sc. One or more of these 17 elements can be contained in steel, and the REM content means the total content of these elements.
• the rod-shaped steel material according to the present invention may contain one or more elements selected from Pb, Se, Te, Bi, S and P, if necessary.
• 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 contained if necessary because of machinability.
• the soft magnetic properties deteriorate. It also reduces toughness.
• Pb 0.30% or less
• Se 0.80% or less
• Te 0.30% or less
• Bi 0.50% or less
• S 0.50 or less
• the Pb content is preferably 0.1% or less, more preferably 0.05% or less.
• the Se content is preferably 0.1% or less, and more preferably 0.05% or less.
• the Te content is preferably 0.1% or less, more preferably 0.05% or less.
• the Bi content is preferably 0.1% or less, and more preferably 0.05% or less.
• the S content is preferably 0.1% or less, and more preferably 0.05% or less.
• the P content is preferably 0.1% or less, and more preferably 0.05% or less.
• Pb 0.0001% or more
• Se 0.0001% or more
• Te 0.0001% or more
• Bi 0.0001% or more
• S 0.0001% or more
• the Pb content is more preferably 0.0004% or more, and even more preferably 0.001% or more.
• the Se content is more preferably 0.0004% or more, and further preferably 0.001% or more.
• the Te content is more preferably 0.0004% or more, and further preferably 0.001% or more.
• the Bi content is more preferably 0.0004% or more, and further preferably 0.001% or more.
• the S content is more preferably 0.0001% or more, and further preferably 0.0002% or more.
• the P content is more preferably 0.0004% or more, and further preferably 0.001% or more.
• the F value is calculated by the following formula (a).
• the F value is an index of whether or not the ferrite single phase is approached during solidification or solid solution heat treatment. If the F value is close to the ferrite single phase, the columnar crystals of the slab increase and RD // ⁇ during the inclined hot rolling described later. 100> Increases fraction and enhances soft magnetic properties. When the F value exceeds 20.0, the RD // ⁇ 100> fraction decreases because it contains austenite and martensite in addition to ferrite. As a result, the soft magnetic properties deteriorate. Therefore, the F value is set to 20.0 or less.
• the F value is preferably 10.0 or less, preferably 0.0 or less, and more preferably -10.0 or less.
• the balance is Fe and impurities.
• impurity is a component mixed by various factors of raw materials such as ore and scrap, and various factors in the manufacturing process when the steel material is industrially manufactured, and is allowed as long as it does not adversely affect the present invention. Means something.
• impurities examples include O, Zn, H and the like. It is preferable that impurities are reduced, but when they are contained, O, Zn and H are preferably 0.01% or less.
• stainless steel rod-shaped steel material steel having the above chemical composition is melted, a slab having a predetermined diameter is cast, and then hot or warm inclined rolling and wire rod rolling are performed. Then, if necessary, solution treatment, pickling, secondary processing, and heat treatment are performed as appropriate.
• the heated slab is preferably hot-worked using inclined rolling.
• hot working is not limited to inclined rolling, and any method that traces the same hot working history may be used. For example, even in bulk rolling (breakdown), if the same hot working history can be obtained, it can be used. can.
• inclined rolling for example, as disclosed in Patent Document 4, three work rolls are arranged on a roll shaft that is twisted and inclined in the same direction around the material to be rolled, and each work roll is made of the material to be rolled. By revolving while rotating around, the material to be rolled is rolled in a spiral shape while advancing.
• the columnar crystals of ferritic stainless steel are oriented in the ⁇ 100> direction with respect to the radial direction of the steel material, but the columnar crystals ⁇ 100> can be oriented in the rolling direction from the radial direction of the steel material by performing inclined rolling.
• the rolling time of inclined rolling the time when the steel material contacts the three work rolls
• ⁇ 100> oriented in the rolling direction by high-speed machining forms recrystallized grains in random directions other than ⁇ 100>. It ends up. Therefore, the rolling time of inclined rolling changes the RD // ⁇ 100> fraction.
• the RD // ⁇ 334> fraction between the surface and the 1/4 depth position of the diameter is changed. Therefore, the rolling time of inclined rolling affects the soft magnetic properties.
• the rolling time of the inclined rolling is 0.10 s or more, preferably 1 s or more, more preferably 10 s or more, and further preferably 50 s or more.
• the productivity is lowered, so that it is preferably 200 s or less.
• Bar wire heat treatment temperature It is preferable that the hot-rolled bar is heat-treated.
• the heat treatment temperature of the bar changes the RD // ⁇ 100> fraction. Therefore, the bar heat treatment temperature affects the soft magnetic properties.
• the bar heat treatment temperature is higher than 1400 ° C.
• the nuclei of RD // ⁇ 100> do not grow and the RD // ⁇ 100> fraction decreases.
• the bar wire heat treatment temperature is preferably 1400 ° C. or lower, preferably 1300 ° C. or lower.
• the bar wire heat treatment temperature is less than 500 ° C., the nuclei of RD // ⁇ 100> do not grow, so the temperature is set to 500 ° C.
• the bar heat treatment temperature is preferably 600 ° C. or higher, more preferably 700 ° C. or higher, and even more preferably 800 ° C. or higher.
• the RD // ⁇ 334> fraction is also affected by the bar heat treatment temperature, and by adjusting the conditions together with other manufacturing conditions within the bar heat treatment temperature range of 500 to 1400 ° C., a suitable RD // ⁇ 334> It can be a fractional range.
• Wire drawing rate It is preferable that the bar wire that has been heat-treated after hot rolling is wire drawn into a steel wire.
• the wire drawing rate changes the RD // ⁇ 100> fraction. Therefore, the wire drawing rate affects the soft magnetic properties.
• the wire drawing processing rate is more than 50%, recrystallization is promoted by the heat treatment in the subsequent process, and the RD // ⁇ 100> fraction is reduced. As a result, the soft magnetic properties deteriorate. Therefore, the wire drawing processing rate is 50% or less, preferably 30% or less, further preferably 15% or less, and even more preferably 5% or less.
• the wire drawing processing rate (%) is a percentage display of the value obtained by dividing the amount of change in the cross-sectional area of the steel material before and after the wire drawing by the cross-sectional area before the wire drawing.
• the RD // ⁇ 334> fraction is also affected by the wire drawing rate, and by adjusting the conditions within the range of the wire drawing rate of 0.01 to 50% together with other manufacturing conditions, suitable RD // ⁇ It can be in the 334> fraction range.
• the drawn steel wire is heat-treated.
• the heat treatment temperature of the steel wire changes the RD // ⁇ 100> fraction. Therefore, the heat treatment temperature of the steel wire affects the soft magnetic properties.
• the heat treatment temperature of the steel wire is preferably 1400 ° C. or lower, preferably 1300 ° C. or lower.
• the temperature of the steel wire is set to 500 ° C. or higher.
• the steel wire heat treatment temperature is preferably 600 ° C. or higher, more preferably 700 ° C. or higher, and even more preferably 800 ° C. or higher.
• the RD // ⁇ 334> fraction is also affected by the steel wire heat treatment temperature, and by adjusting the conditions together with other manufacturing conditions within the steel wire heat treatment temperature range of 500 to 1400 ° C., a suitable RD // ⁇ 334> It can be a fractional range.
• Electromagnetic parts The electromagnetic parts using the stainless steel rod-shaped steel material of the present invention are, for example, cores and connectors such as injectors and solenoid valves, and since the rod-shaped steel material used as the material has excellent soft magnetic properties, "magnetic attraction” It can produce effects such as “improvement”, “reducing the diameter of parts”, and “improvement of responsiveness”.
• the cast slab is heated, inclined-rolled for a rolling time of 3 s, and subsequently annealed and rolled to produce a bar wire (bar-shaped steel material) having a diameter of 20.0 mm at 900 ° C. Bar wire heat treatment was performed.
• the RD // ⁇ 100> fraction is 200 times the field of view in the surface layer portion, the central portion, and the 1/4 depth position portion existing between the surface layer portion and the central portion in the L cross section of the wire rod.
• One or more visual fields were measured.
• the crystal orientation of each crystal grain in the observation field of view was analyzed using FE-SEM / EBSD.
• the rolling direction is RD
• the crystal plane in the RD direction is analyzed
• the orientation component of ⁇ 001> is only the portion within the clearance of 25 ° (the crystal in which the angle difference between the ⁇ 100> orientation and the rolling direction is 25 ° or less). It was displayed, and the RD // ⁇ 100> fraction (area ratio ( ⁇ )) (average of the surface layer portion, the central portion, and the 1/4 depth position portion) was measured.
• the RD // ⁇ 334> fraction is 200 times the field of view in the L cross section of the wire rod between the surface at a depth of 1/4 of the diameter, specifically at the depth of 1/8 of the diameter from the surface. Then, one or more visual fields were measured. Then, the crystal orientation of each crystal grain in the observation field of view was analyzed using FE-SEM / EBSD.
• the rolling direction is RD
• the crystal plane in the RD direction is analyzed
• the orientation component of ⁇ 334> is displayed only in the portion within the clearance of 10 °
• the RD // ⁇ 334> fraction area ratio (-)) (surface). 1/8 depth position of the diameter) was measured.
• the magnetic flux density (T) at 5Oe was measured.
• a ring-shaped test piece having a thickness of 3 mm ⁇ an outer diameter of 10 mm ⁇ an inner diameter of 8 mm was prepared, and after heat treatment at 900 ° C. ⁇ 2 hr, the magnetic flux density at 5 Oe was measured.
• the relationship between RD // ⁇ 100> and the magnetic characteristics was evaluated, and sampling was performed in the same manner below. Magnetic flux density: 0.1 T or more was considered good.
• the ring-shaped test piece was heat-treated at 900 ° C. ⁇ 2 hr, and the maximum magnetic flux density (T) at 10 Oe was measured at 2 kHz. Maximum magnetic flux density: 0.05 T or more was considered good.
• No. 1 to 39 satisfied the provisions of the present invention and had good soft magnetic properties. On the other hand, No. which does not satisfy the provisions of the present invention. 40 to 55 had poor soft magnetic properties.
• a rod-shaped steel material having excellent soft magnetic properties can be obtained, which is extremely useful in industry.

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