Method for producing a workpiece and a workpiece

US8252125B2 · kind B2 · utility

Assignee

• BENTELER AUTOMOBILTECHNIK GMBH · DE

Inventors

• Hubertus Giefers · Paderborn, DE
• Karsten Bake · Delbrück, DE
• Andreas Frehn · Ritterhude, DE
• Alexander Redenius · Braunschweig, DE
• Uwe Diekmann · Paderborn, DE

Key dates

• Filing date: Oct 16, 2009
• Grant date: Aug 28, 2012
• Expiry date: Aug 10, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2211/008
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention, among other things, relates to a method for producing a workpiece by press hardening a semi-finished product, which is distinguished by the fact that the semi-finished product consists of a steel which has a high content of silicon of at least 0.9 wt. %, with a simultaneously small content of manganese of less than 0.9 wt. %, a small carbon content of less than 0.25 wt. %, and a high chromium content of more than 1.20 wt. %, and which by heating is brought to a state in which the structure of the steel that is used is at least partially transformed to austenite, also optionally fully transformed to austenite, and the thus-heated semi-finished product is hot shaped so that after the hot deformation shaping, a structure is present in the workpiece that has a complex phase structure with predominantly martensite and ferrite fractions. In addition, a workpiece is described, which is produced according to this method, as well as uses of such a workpiece.