Production mannered null mass of the high intensity martensite type stainless steel steel wire and the wire rod and the steel wire of the large diameter which is superior in spring

摘要

PROBLEM TO BE SOLVED: To inexpensively provide thick-sized high strength martensitic stainless steel wire having excellent ductility and spring cold formability and steel wire as the stock therefor for inexpensively producing a thick-sized spring product having lightness and durability.;SOLUTION: The thick-sized high strength martensitic stainless steel wire has a composition comprising, by mass, 0.13 to 0.30% C, 0.2 to 3.0% Si, ≤2.0% Mn, 11.0 to 17.0% Cr and ≤0.15% N, and further comprising 0.1 to 4.0% Ni, and in which C+0.4N is controlled to 0.15 to 0.30%, and M value is controlled to ≥0(%), has a tensile strength of 1,600 N/mm² and a tensile fracture construction of ≥30%, and has a wire diameter of ϕ4.5 to 20 mm: M value(%)=Ni+0.12Mn+0.44Cu+18N+30C-1.2Cr-1.8Si-1.7Mo+13.;COPYRIGHT: (C)2008,JPO&INPIT