High strength and high toughness stainless steel sheet and metho

Details High strength and high toughness stainless steel sheet and metho High strength and high toughness stainless steel sheet and metho

1993-07-29

1994-05-24

Yee, Deborah

Metal treatment

Stock

Ferrous

148327, 148610, C22C 3840, C21D 800

Patent

active

053145496

ABSTRACT:
A stainless steel sheet essentially consisting of: 0.01 to 0.2 wt. % C, 0.1 to 2 wt. % Si, 0.1 to 2 wt. % Mn, 4 to 11 wt. % Ni, 13 to 20 wt. % Cr, 0.01 to 0.2 wt. % N, 0.0005 to 0.0025 wt. % sol.Al, 0.002 to 0.01 wt. % O, 0.009 wt. % or less S, and the balance being Fe and inevitable impurities; the sheet containing 40 to 90% martensite; and the steel sheet having a 1400 N/mm.sup.2 or more tensile stress when a tensile strain is 1.0%. The invention also provides a method for producing a stainless steel sheet comprising the steps of: applying to the steel sheet a process of first cold rolling (CR.sub.1)--first intermediate annealing--second cold rolling (CR.sub.2)--second intermediate annealing--third cold rolling (CR.sub.3)--the final annealing--fourth cold rolling (CR.sub.4)--low temperature heat treatment; the first-, second- and third cold reduction ratio being 30% to 60%; the annealing temperatures in the first-, second- and final annealing being in the range of 950.degree. C. to 1100.degree. C.; the fourth cold reduction ratio being 66% to 76%; and the low temperature heat treatment ranging 300.degree. C. to 600.degree. C. for a period of 0.1 sec to 300 sec.

REFERENCES:
patent: 4849166 (1989-07-01), Hoshino et al.
patent: 5167731 (1992-12-01), Minami et al.
patent: 5232520 (1993-08-01), Oka et al.

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