Free cutting steel

US8124008B2 · kind B2 · utility

Assignees

• JFE BARS AND SHAPES · JP
• National Institute of Advanced Industrial Science and Technology · JP
• Kiyohito Ishida · JP

Inventors

• Toshiyuki Murakami · Yamanashi, JP
• Tetsuo Shiraga · Tokyo, JP
• Kiyohito Ishida · Sendai, JP
• Katsunari Oikawa · Murata, JP

Key dates

• Filing date: Nov 29, 2002
• Grant date: Feb 28, 2012
• Expiry date: Aug 28, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/60
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A low carbon free cutting steel can be obtained by allowing the steel to contain 0.02 to 0.15 mass % of C, 0.05 to 1.8 mass % of Mn, 0.20 to 0.49 mass % of S, more than 0.01 mass % and not more than 0.03 mass % of O, 0.3 to 2.3% of Cr, and the balance consisting of Fe and inevitable impurities, the Cr/S ratio falling within a range of between 2 and 6.