Method and installation for producing hot-rolled strip from austenitic stainless steels

US7922840B2 · kind B2 · utility

Assignee

• SMS SIEMAG AG · DE

Inventors

• Ingo Schuster · Willich, DE
• Manfred Albedyhl · Mettmann, DE

Key dates

• Filing date: May 15, 2009
• Grant date: Apr 12, 2011
• Expiry date: May 15, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D8/0263
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method for producing hot-rolled strip from austenitic stainless steels. In a first step, a cast product is subjected to a rolling operation in a rolling mill with a finishing train, and, in a second step, a heat treatment is carried out to prevent susceptibility to corrosion, especially intergranular corrosion due to chromium carbide precipitation. To establish the final rolling temperature (Twe), a run-in temperature (Tein) of the cast product into the finishing train of the rolling mill that is above 1,150° C., and preferably above 1,200° C., is established by a multistage heating process, especially a two-stage heating process, which comprises a preheating stage and an intensive heating stage, and the heat treatment is carried out by directly utilizing the rolling heat.