Title:
FERRITIC STAINLESS STEEL EXCELLENT IN DUCTILITY, AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JP3463500
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To effectively utilize a transformation induced plasticity(TRIP) and to obtain a high ductility by specifying the composition of a stainless steel containing ferritic phase as a principal constituent structure and also specifying respective percentages of retained austenitic phase and martensitic phase.
SOLUTION: This steel has a composition which consists of, by mass, ≤0.10% C, ≤1.0% Si, ≤1.5% Mn, 16.0-25.0% Cr, 0.020-0.070% N, and the balance iron and contains, if necessary, ≤1.0% Cu, ≤3.0% Ni and/or ≤1.0% Al, and ≤1.0% Mo and in which Cr equivalent, represented by (Cr equivalent)=Cr%+Mo%+1.5 Si%, and Ni equivalent, represented by (Ni equivalent)=Ni%+30C%+30N %+0.5Mn%, are regulated to 17.5-24.5% and 2.0-6.0%, respectively. Further, this steel has a structure which contains 5-20% retained austenitic phase while having ferritic phase as a principal constitutent phase at room temp. and in which the amount of martensitic phase is limited to ≤5%. By this method, the ferritic stainless steel having a characteristic of ≥ about 30% tensile fracture elongation can be obtained.
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Inventors:
Akihiro Matsuzaki
Shigeaki Takagi
Shigeaki Takagi
Application Number:
JP3996197A
Publication Date:
November 05, 2003
Filing Date:
February 07, 1997
Export Citation:
Assignee:
JFE Steel Corporation
International Classes:
C21D6/00; C21D9/46; C22C38/00; C22C38/40; (IPC1-7): C22C38/00; C21D6/00; C21D9/46; C22C38/40
Attorney, Agent or Firm:
Daitaro Shiraki