PURPOSE: To produce an austenitic stainless cold rolled steel sheet excellent in oxidation resistance and rusting resistance by recuperating the surface of a thin band-shaped slab subjected to continuous casting without being subjected to forced cooling, cooling the same and executing cold rolling.
CONSTITUTION: The slab of a thin band-shaped austenitic stainless steel having about ≤6mm thickness is cast by using a continuous casting machine in which the wall face of a mold is moved synchronism with the slab. The surface of the slab is recuperated without forcedly cooling the slab, and it is held for at least ≥2sec in a temp. range of 1300 to 1200°C. After that, it is cooled and coiled and is successively subjected to cold rolling, air annealing and descaling or bright annealing. Thus, the austenitic stainless steel sheet in which the Ni distribution in the surface of the cold rolled face is regulated to 0.9 to <1.0 by the Ni segregating degree A calculated by the formula; Ni segregating degree A/Nimin/Niave and excellent in oxidation resistance can be produced.
SUEHIRO TOSHIYUKI
ISHIMARU EIICHIROU
TAKAHASHI TSUNETOSHI