| 摘要 |
PROBLEM TO BE SOLVED: To provide a low Ni austenitic stainless steel sheet which has high age hardening property usable for applications to which 300 series stainless steel for high strength is applied, while contents of Ni and Mn are suppressed to minimum requirements.SOLUTION: There is provided the low Ni austenitic stainless steel sheet excellent in age hardening property containing, by mass%, C:0.03 to 0.30%, Si:1.50% or less, Mn:2.0 to 5.0%, P:0.06% or less, S:0.005% or less, Ni:1.0 to 4.0%, Cr:15.0 to 19.0%, Cu:1.0 to 3.5%, N:0.03 to 0.30%, Sn:0.02%, B:0.001 to 0.010% and the balance Fe with inevitable impurities. The low Ni austenitic stainless steel sheet excellent in age hardening property has a surface hardness at any parts of 400 HV or more, a deformation-induced martensite content of 10% or more, and a full-width at half maximum in a crystal orientation (211) of the deformation-induced martensite of 1.5° or more at X-ray analysis at 40 kV and 200 mA in a target of Co. |
