- 专利标题: METHOD FOR PRODUCING A SCREW, AND SCREW
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申请号: US17910917申请日: 2021-03-16
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公开(公告)号: US20230136145A1公开(公告)日: 2023-05-04
- 发明人: Ralph J. HELLMIG , Michael ACHENBACH , Fabian SIMONSEN
- 申请人: EJOT SE & Co. KG
- 申请人地址: DE Bad Berleburg
- 专利权人: EJOT SE & Co. KG
- 当前专利权人: EJOT SE & Co. KG
- 当前专利权人地址: DE Bad Berleburg
- 优先权: DE102020107194.9 20200316
- 国际申请: PCT/EP2021/056712 WO 20210316
- 主分类号: C21D1/78
- IPC分类号: C21D1/78 ; C21D1/20 ; C21D9/00
摘要:
The invention relates to a method for producing a screw, having the following steps: (a) rolling a screw wire made of low-alloy carbon steel to produce screw (10) having a thread; (b) heating the entire screw (10) to an austenitizing temperature under a carbon atmosphere and/or nitrogen atmosphere and maintaining the temperature; (c) quenching the entire screw (10) to a bainitizing temperature and maintaining the bainitizing temperature until the screw has a bainitic structure over its cross-section. The invention is characterized in that the screw (10) is subsequently hardened locally at its tip (22), by the tip (22) being heated to an austenitizing temperature and the screw (10) being subsequently quenched to a temperature below the martensite starting temperature (MS).
公开/授权文献
- US1338706A Protecting device for ships 公开/授权日:1920-05-04
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