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High strength double phase stainless steel wire rod excellent in spring fatigue characteristic, manufacturing method thereof, and high strength double phase stainless steel wire excellent in spring fatigue characteristics
High strength double phase stainless steel wire rod excellent in spring fatigue characteristic, manufacturing method thereof, and high strength double phase stainless steel wire excellent in spring fatigue characteristics
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机译：弹簧疲劳特性优异的高强度双相不锈钢线材，其制造方法以及弹簧疲劳特性优异的高强度双相不锈钢线
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摘要
PROBLEM TO BE SOLVED: To provide a high strength dual-phase stainless steel wire and wire rod exhibiting excellent strength and spring fatigue characteristic.SOLUTION: The high strength dual-phase stainless steel wire rod excellent in spring fatigue characteristic is provided which contains C:0.21% or less, Si:0.05 to 3.2%, Mn:over 1% to 15%, Ni:0.5% or more and less than 5%, Cr:10 to 25%, Mo:3.0% or less, Cu:3.0% or less, N:0.02 to 0.35% and the balance Fe with inevitable impurities, and in which an Md30 value in γ represented by an expression (a) is -15 to 40, α, γ grain diameter is 10 μm or less, and γ amount is 30 to 80 vol.%. The high strength dual-phase stainless steel wire (for precision spring) excellent in fatigue characteristic is also provided which has a tensile strength of 1600 to 2100 MPa, deformation-induced martensite amount of 1 to 40 vol.%, α amount of 20 to 70 vol.% and α, γ, α' grain diameter of 5 μm or less. Md30=551-462(C+N)-9.2Si-8.1Mn-29(Ni+Cu)-13.7Cr-18.5Mo... (a).
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