Anisotropy inside the surface when forming to be small the ferritic stainless steel sheet and its production mannered null mass which are superior in resistance rijingu Characteristic and resistance

摘要

PROBLEM TO BE SOLVED: To provide a ferritic stainless steel sheet excellent in plane anisotropy upon forming, ridging resistance and roughening resistance, and to provide a method for producing the same.;SOLUTION: The stainless steel sheet has a steel composition containing, by mass, 0.005 to 0.100% C, 0.01 to 2.00% Si, 0.01 to 2.00% Mn, 0.040% P, ≤0.03% S, 10 to 22% Cr, 0.0005 to 0.2000% Al and 0.005 to 0.080% N, and the balance iron with inevitable impurities. The value of γp(%) satisfies 20 to 65%, which is calculated by formula (1): γp=420X[C]+470X[N]+23X[Ni]+12X[Cu]+7X[Mn]-11.5X([Cr]+[Si])-52X[Al]-49X[Ti]+189, wherein [ ] denotes mass%. In the sheet face, the difference between the maximum value and the minimum value of tensile strength when a tensile test is performed from the rolling direction to the three directions of 0°, 45° and 90° is 20 MPa, and the earing height is ≤2.0 mm after cylindrical deep drawing at a contraction ratio under the conditions of: a punch diameter of Φ50 mm, a punch shoulder R of 5 mm, a die shoulder R of 5 mm, a blank diameter of Φ100 mm, a wrinkle pressing force of 1t, and a friction coefficient of 0.11 to 0.13.;COPYRIGHT: (C)2007,JPO&INPIT