Method of making a hardened steel part, especially a roll load-bearing steel part

US7387694B2 · kind B2 · utility

Assignee

• Rexroth Star GmbH · DE

Inventors

• Norbert Siebenlist · Schweinfurt, DE
• Walter Krauss · Starnberg, DE

Key dates

• Filing date: Oct 7, 2003
• Grant date: Jun 17, 2008
• Expiry date: Nov 21, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D7/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The method of making a hardened steel part or component includes making a semi-finished article of air-hardened steel; cold-forming the semi-finished article into a finished-shape part or component with a desired or predetermined finished shape and then hardening the finished-shape part or component with the finished shape by a heat treating process. The air-hardened steel particularly preferably contains about 0.67% by weight carbon, about 1.50 % by weight silicon, about 1.50% by weight manganese, about 1.00% by weight chromium, about 0.10% by weight nickel, about 0.25% by weight molybdenum, and a balance or remaining portion of iron with standard impurities.