Stainless steel, cold strip produced from this steel, and method for producing a flat steel product from this steel

US8608873B2 · kind B2 · utility

Assignee

• Outokumpu Nirosta GmbH · DE

Inventors

• Cornel Abratis · Hamburg, DE
• Lutz Ernenputsch · Krefeld, DE
• Wilfried Klos · Neuss, DE
• Hans-Joachim Krautschick · Solingen, DE
• Michael Sachtleber · Korschenbroich, DE

Key dates

• Filing date: Sep 3, 2009
• Grant date: Dec 17, 2013
• Expiry date: Sep 3, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2211/005
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A stainless steel and a flat cold product produced therefrom, which can be easily produced in an economical manner. A steel according to the invention, in the cold-rolled state, has a microstructure with 5-15% by volume δ-ferrite and austenite as the remainder. It contains (in % by weight):C: 0.05-0.14%, Si: 0.1-1.0%, Mn: 4.0-12.0%, Cr: >17.5-22.0%, Ni: 1.0-4.0%, Cu: 1.0-3.0%, N: 0.03-0.2%, P: max. 0.07%, S: max. 0.01%, Mo: max. 0.5%, optionally one or more elements from the group consisting of Ti, Nb, B, V, Al, Ca, As, Sn, Sb, Pb, Bi, and H wherein Ti: max. 0.02%, Nb: max. 0.1%, B: max. 0.004%, V: max. 0.1%, Al: 0.001-0.03%, Ca: 0.0005-0.003%, As: 0.003-0.015%, Sn: 0.003-0.01%, Pb: max. 0.01%, Bi: max. 0.01%, H: max. 0.0025%, and remainder Fe and unavoidable impurities.