Process for producing steel article

US7563333B2 · kind B2 · utility

Assignee

• Uddeholm Tooling Aktiebolag · SE

Inventors

• Odd Sandberg · Uddeholm, SE
• Lennart Jönson · Karlstad, SE

Key dates

• Filing date: May 26, 2006
• Grant date: Jul 21, 2009
• Expiry date: May 24, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D1/25
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention concerns an article of a steel which is characterized in that it consists of an alloy which contains in weight-%: 1.2-2.0 C, 0.1-1.5 Si, 0.1-2.0 Mn, max. 0.2 N, max. 0.25 S, 4-8 Cr, 0.5-3.5 (Mo+W/2), 5-8 V, max. 1.0 Nb, balance essentially only iron and unavoidable impurities, and that the steel has a micro-structure obtainable by a manufacturing of the steel which comprises spray forming of an ingot, the micro-structure of which contains 8-15 vol-% carbides of essentially only MC-type where M substantially consists of vanadium, of which carbides at least 80 vol-% have a substantially rounded shape and a size in the longest extension of the carbides amounting to 1-20 μm.