METASTABLE AUSTENITIC STAINLESS STEEL WIRE USED FOR HIGH STRENGTH STEEL WIRE FOR SPRING EXCELLENT IN RIGIDITY

摘要

PROBLEM TO BE SOLVED: To stably obtain high strength stainless steel wire whose rigidity is remarkably improved, and having the rigidity equal to that of piano wire as carbon steel.;SOLUTION: The metastable austenitic stainless steel wire for a high strength/high rigidity spring contains components containing, by mass, 0.03 to 0.14% C, 0.1 to 4.0% Si, 1.0 to 8.0% Mn, 1.0 to 5.0% Ni, 13.0 to 19.0% Cr and 0.05 to 0.30% N, and the balance Fe with inevitable components, and in which the value of Md30 expressed by specified formula is -10 to 40(°C). The stainless steel wire, if required, further has a tensile strength of ≥2,000 N/mm², a rigidity of ≥70 GPa, and a stain-induced martensite content of 20 to 80 vol.%. If required, further, Cr carbonitrides with an average grain size of ≤0.2 μm are dispersed by low temperature aging at 200 to 600°C.;COPYRIGHT: (C)2006,JPO&NCIPI