Invention Grant
- Patent Title: High carbon hot rolled steel sheet and method for manufacturing the same
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Application No.: US14370314Application Date: 2012-12-26
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Publication No.: US10077491B2Publication Date: 2018-09-18
- Inventor: Nobuyuki Nakamura , Takashi Kobayashi , Yoshimasa Funakawa
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: RatnerPrestia
- Priority: JP2012-000407 20120105
- International Application: PCT/JP2012/008318 WO 20121226
- International Announcement: WO2013/102986 WO 20130711
- Main IPC: C22C38/60
- IPC: C22C38/60 ; C21D9/46 ; C22C38/00 ; C22C38/06 ; C21D8/02 ; C22C38/02 ; C22C38/04 ; C22C38/18 ; C21D1/26 ; C22C38/08 ; C22C38/12 ; C22C38/16 ; C22C38/32 ; C22C38/54 ; C21D1/32

Abstract:
A high carbon hot rolled steel sheet and a method for manufacturing the same are provided, wherein excellent cold workability and excellent hardenability are obtained stably. The high carbon hot rolled steel sheet has a composition containing C: 0.20% to 0.48%, Si: 0.1% or less, Mn: 0.5% or less, P: 0.03% or less, S: 0.01% or less, sol. Al: more than 0.10% and 1.0% or less, N: 0.005% or less, B: 0.0005% to 0.0050%, and the remainder composed of Fe and incidental impurities, on a percent by mass basis, and a microstructure composed of ferrite and cementite, wherein the average grain size of the above-described ferrite is 10 to 20 μm and the spheroidization ratio of the above-described cementite is 90% or more.
Public/Granted literature
- US20150090376A1 HIGH CARBON HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME Public/Granted day:2015-04-02
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