Stainless steel sheet and method for producing thereof

Details Stainless steel sheet and method for producing thereof Stainless steel sheet and method for producing thereof

1994-01-31

1995-04-18

Yee, Deborah

Metal treatment

Stock

Ferrous

148327, 148610, C22C 3810, C22C 3840, C21D 802

Patent

active

054074932

ABSTRACT:
A fracture resistant stainless steel sheet comprises: non-metallic inclusions of Al.sub.2 O.sub.3, MnO, and SiO.sub.2 which inevitably exist in stainless steel; the non-metallic inclusions having a composition situated in a region defined by nine points in a phase diagram of a 3-component system of "Al.sub.2 O.sub.3 -MnO-SiO.sub.2 "; the stainless steel sheet having an 1.0% on-set stress of at least 1520 N/mm.sup.2 (155 kgf/mm.sup.2); the stainless steel sheet having an anisotropic difference of 1.0% on-set stress of 196 N/mm.sup.2 (20 kgf/mm.sup.2) or less; and the stainless steel sheet having a punch test work load of at least 25 kgf.multidot.mm or more.
A method for producing a high fracture resistant stainless steel sheet comprises the steps of: preparing a stainless steel strip; applying to the stainless steel strip a process of annealing--pickling --first cold rolling (CR.sub.1)--first intermediate annealing--second cold rolling (CR.sub.2)--second intermediate annealing--third cold rolling (CR.sub.3)--final annealing--fourth cold rolling (CR.sub.4)--low temperature heat treatment.

REFERENCES:
patent: 3660173 (1972-05-01), Matsuno et al.
patent: 4849166 (1989-07-01), Hoshino et al.
patent: 4963200 (1990-10-01), Okuda et al.
patent: 5167731 (1992-12-01), Minami et al.
patent: 5232520 (1993-08-01), Oka et al.

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