Fully martensitic steel alloy

US6030469A · kind A · utility

Assignee

• ABB RESEARCH LTD. · CH

Inventors

• Peter Ernst · Hattersheim, DE
• Peter Uggowitzer · Ottenbach, CH
• Markus Speidel · Birmenstorf, CH
• Alkan Göcmen · Baden, CH

Key dates

• Filing date: Mar 20, 1998
• Grant date: Feb 29, 2000
• Expiry date: Mar 20, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D1/18
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A fully martensitic quenching and tempering steel (AP) essentially consists of (measured in % by weight): 8 to 15% of Cr, up to 15% of Co, up to 4% of Mn, up to 4% of Ni, up to 8% of Mo, up to 6% of W, 0.5 to 1.5% of V, up to 0.15% of Nb, up to 0.04% of Ti, up to 0.4% of Ta, up to 0.02% of Zr, up to 0.02% of Hf, at most 50 ppm of B, up to 0.1% of C and 0.12-0.25% of N, the content of Mn+Ni being less than 4% and the content of Mo+W being less than 8%, the remainder being iron and usual impurities resulting from smelting.