Invention Grant
- Patent Title: Steel material
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Application No.: US17311543Application Date: 2019-12-27
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Publication No.: US12104234B2Publication Date: 2024-10-01
- Inventor: Akira Shiga , Yutaka Neishi
- Applicant: NIPPON STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL CORPORATION
- Current Assignee: NIPPON STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Greer, Burns & Crain, Ltd.
- Priority: JP 18246367 2018.12.28
- International Application: PCT/JP2019/051470 2019.12.27
- International Announcement: WO2020/138432A 2020.07.02
- Date entered country: 2021-06-07
- Main IPC: C22C38/54
- IPC: C22C38/54 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/42 ; C22C38/44 ; C22C38/46 ; C22C38/48 ; C22C38/50

Abstract:
There is provided a steel material that has a high critical working ratio in cold forging and has a high fatigue strength and an excellent hydrogen embrittlement resistance when the steel material is formed into a carburized-steel component. The steel material according to the present embodiment has a chemical composition that contains, in mass %, C: 0.07 to 0.13%, Si: 0.15 to 0.35%, Mn: 0.60 to 0.80%, S: 0.005 to 0.050%, Cr: 1.90 to 2.50%, B: 0.0005 to 0.0100%, Ti: 0.010 to less than 0.050%, Al: 0.010 to 0.100%, Ca: 0.0002% to 0.0030%, N: 0.0080% or less, P: 0.050% or less, and O: 0.0030% or less, with the balance being Fe and impurities, and satisfies Formula (1) to Formula (5) described in the specification.
Public/Granted literature
- US20220106671A1 STEEL MATERIAL Public/Granted day:2022-04-07
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