METHOD FOR PRODUCING THIN SHEET FROM A STAINLESS AUSTENITIC CRMNNI STEEL

摘要

The invention relates to a method for producing sheets and strips, in particular fine sheet, from stainless austenitic CrMnNi steel having the following composition: Mn: 7.6 to 8.7 wt%; Cr: 16.5 to 16.99 wt%; Ni: 3.8 to 4.3 wt%; Mo: 0.51 to 1.0 wt%; N: 0.18 to 0.45 wt%; C: 0.04 wt%; Si: 0.5 wt%; P: 0.04 wt%; S: 0.01 wt%; the rest iron and unavoidable impurities, the method comprising the steps of: melting the steel by a conventional smelting method, casting the steel melt as an extrusion or an ingot, hot rolling the extrusion or the ingot into a slab, further processing of the slab to a preliminary strip and then to a hot strip, scaling and annealing the hot strip, and cold rolling to a cold strip, wherein the steel in the solution-annealed state contains δ-ferrite components 3 vol% and in the cold-rolled state the steel additionally contains a α'-martensite component of up to 50 vol%.