Invention Grant
- Patent Title: High toughness abrasion resistant steel with little change in hardness during use and method of production of same
- Patent Title (中): 使用时硬度变化小的高韧性耐磨钢及其制造方法
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Application No.: US11991592Application Date: 2006-08-18
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Publication No.: US08097099B2Publication Date: 2012-01-17
- Inventor: Naoki Saitoh , Tatsuya Kumagai , Katsumi Kurebayashi , Hirohide Muraoka
- Applicant: Naoki Saitoh , Tatsuya Kumagai , Katsumi Kurebayashi , Hirohide Muraoka
- Applicant Address: JP Tokyo
- Assignee: Nippon Steel Corporation
- Current Assignee: Nippon Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: Kenyon & Kenyon LLP
- Priority: JP2005-262297 20050909
- International Application: PCT/JP2006/316657 WO 20060818
- International Announcement: WO2007/029515 WO 20070315
- Main IPC: C22C38/22
- IPC: C22C38/22 ; C22C38/54
Abstract:
The present invention provides an abrasion resistant steel having a hardness of HB400 to HB520, having little change of hardness during long term use, and superior in toughness, characterized by containing, by mass %, C: 0.21% to 0.30%, Si: 0.30 to 1.00%, Mn: 0.32 to 0.70%, P: 0.02% or less, S: 0.01% or less, Cr: 0.1 to 2.0%, Mo: 0.1 to 1.0%, B: 0.0003 to 0.0030%, Al: 0.01 to 0.1%, and N: 0.01% or less, further containing one or more of V: 0.01 to 0.1%, Nb: 0.005 to 0.05%, Ti: 0.005 to 0.03%, Ca: 0.0005 to 0.05%, Mg: 0.0005 to 0.05%, and REM: 0.001 to 0.1%, having a balance of Fe, and furthermore having an ingredient with an M value defined by the following formula (1) of −10 to 16: M=26×[Si]−40×[Mn]−3×[Cr]+36×[Mo]+63×[V] (1)
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