Low carbon resulfurized free cutting steel

US8691141B2 · kind B2 · utility

Assignee

• JFE BARS AND SHAPES · JP

Inventors

• Toshiyuki Murakami · Yamanashi, JP
• Kunikazu Tomita · Tokyo, JP
• Tetsuo Shiraga · Tokyo, JP

Key dates

• Filing date: Dec 9, 2009
• Grant date: Apr 8, 2014
• Expiry date: Jan 9, 2030

Classification

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

Abstract

A low carbon resulfurized free cutting steel consisting of 0.04 to 0.15% of C, more than 0.10% and 0.70% or less of Si, 0.85 to 1.50% of Mn, 0.040 to 0.120% of P, 0.250% or more and less than 0.400% of S, less than 0.005% of Al, more than 0.0020% and 0.0120% or less of O, and more than 0.0070% and 0.0150% or less of N, all by mass percentage, and the balance of Fe and inevitable impurities, and satisfying a formula (1) and a formula (2), as follows:0.15%≦Si %+2×P %−(5×Al %+10×O %+3×N %)≦0.75%  (1), and([Mn %]5)/15<S %<([Mn %]5)/2  (2).