High carbon hot-rolled steel sheet

US8071018B2 · kind B2 · utility

Assignee

• JFE Steel Corporation · JP

Inventors

• Nobusuke Kariya · Yokohama, JP
• Norio Kanamoto · Chiba, JP
• Hidekazu Ookubo · Chiba, JP
• Yoshiharu Kusumoto · Chiba, JP
• Takeshi Fujita · Takarazuka, JP

Key dates

• Filing date: Jun 22, 2010
• Grant date: Dec 6, 2011
• Expiry date: Jun 22, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/58
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A high carbon hot-rolled steel sheet which is a hot-rolled spheroidizing annealed material, including 0.2 to 0.7% C, 2% or less Si, 2% or less Mn, 0.03% or less P, 0.03% or less S, 0.08% or less Sol.Al., and 0.01% or less N, by mass, which contains carbide having a particle size of smaller than 0.5 μm in a content of 15% or less by volume to the total amount of carbide, and the difference between the maximum hardness Hv max and the minimum hardness Hv min, ΔHv (=Hv max−Hv min), in the sheet thickness direction being 10 or smaller.