| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an austenitic stainless steel which exhibits excellent bendability while suppressing Ni to a necessary minimum content, and has settling resistance regarded to be essential as a spring made of a high-strength stainless steel and corrosion resistance in combination. Ž<P>SOLUTION: The stainless steel for a low-Ni spring which is excellent in settling resistance and bendability contains by mass%, 0.10≤C+0.5N≤0.25% (where C<.05%, N>0.05%), Si≤1.5%, 0.5%≤Mn<3.0%, P≤0.06%, S≤0.05%, 1.5%≤Ni<5.0%, 15.0%≤Cr≤19.0%, 0.8%≤Cu≤0.8 to 4.0%, and the balance Fe and inevitable impurities, wherein the austenite stability index Md<SB>30</SB>expressed by formula (1): Md<SB>30</SB>=551-462(C+N)-9.2Si-8.1Mn-29(Ni+Cu)-13.7Cr is 0 to 60 and the lamination defect energy generation index SFE expressed by formula (2): SFE=6.2Ni+18.6Cu+0.7Cr+3.2Mn-53 is ≥0 and <40, and working induced martensite phase is contained by 5 to 50 vol.%, the balance an austenite phase. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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