Steel alloy for a low-alloy steel for producing high-strength seamless steel tubing

US8865061B2 · kind B2 · utility

Assignee

• VALLOUREC DEUTSCHLAND GmbH · DE

Inventors

• Christoph Kaucke · Mülheim an der Ruhr, DE
• Guido Kubla · Bottrop, DE
• Heinz Sanders · Hagen, DE
• Charles Stallybrass · Mülheim an der Ruhr, DE
• Andre Schneider · Moissac, FR
• Markus Schütz · Eßlingen, DE

Key dates

• Filing date: Jan 23, 2009
• Grant date: Oct 21, 2014
• Expiry date: May 16, 2029

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/22
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a steel alloy for a low alloy steel for producing high-tensile, weldable, hot-rolled seamless steel tubing, in particular construction tubing. The chemical composition (in % by mass) is: 0.15-0.18% C; 0.20-0.40% Si; 1.40-1.60% Mn; max. 0.05% P; max. 0.01% S; >0.50-0.90% Cr; >0.50-0.80% Mo; >0.10-0.15% V; 0.60-1.00% W; 0.0130-0.0220% N; the remainder is made up of iron with production-related impurities; with the optional addition of one or more elements selected from Al, Ni, Nb, Ti, with the proviso that the relationship V/N has a value of between 4 and 12 and the Ni content of the steel is not more than 0.40%.