The austenite type rustless steel where cold rolling surface quality is superior it is thin production manner and cast piece null of the band-like

摘要

PURPOSE: To produce an austenitic stainless steel thin strip excellent in cold- rolled surface quality improved in roping and uneven glossiness by specifying component composition of Cr equivalent and Ni equivalent, rolling condition and heat treatment condition. CONSTITUTION: The component composition of this austenitic stainless steel satisfys the inequality I with respect to the Cr equivalent defined with, by wt.%, Cr+Mo+1.5 Si, and the Ni equivalent defined with Ni+30(C+N)+0.5 (Mn+Cu). Rolling is executed at 20% to 30% rolling ratio Rd, which is defined with the equation II. Successively, the heat treatment is executed in a condition that the heat treatment equivalent time at 1100 deg.C defined with the equation III satisfys the inequality IV and successively, this strip is coiled at =600 deg.C. Wherein, in the inequalities and the equations, P is rolling load, W is the width of cast strip, T1 is a temp. at the inlet side of rolling, T2 is a temp. at the outlet side of rolling, Ti is each temp. of respective patterns obtd. by dividing a heat pattern during a process between the rolling and the cooling by 0.1sec interval steps. Q is activated energy and R is the gas constant.