发明公开
EP2199422A1 Low-carbon precipitation-strengthened steel for cold heading applications
审中-公开
Kohlenstoffarmer，ausscheidungsgehärteterStahlfürKaltstauchanwendungen
- 专利标题： Low-carbon precipitation-strengthened steel for cold heading applications
- 专利标题（中）： Kohlenstoffarmer，ausscheidungsgehärteterStahlfürKaltstauchanwendungen
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申请号： EP08021703.7申请日： 2008-12-15
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公开(公告)号： EP2199422A1公开(公告)日： 2010-06-23
- 发明人: The designation of the inventor has not yet been filed
- 申请人： Swiss Steel AG , ArcelorMittal Hamburg GmbH , Instytut Metalurgii Zelaza
- 申请人地址： Emmenweidstrasse 90 6020 Emmenbrücke CH
- 专利权人： Swiss Steel AG,ArcelorMittal Hamburg GmbH,Instytut Metalurgii Zelaza
- 当前专利权人： Swiss Steel AG,ArcelorMittal Hamburg GmbH,Instytut Metalurgii Zelaza
- 当前专利权人地址： Emmenweidstrasse 90 6020 Emmenbrücke CH
- 代理机构： Felder, Peter
- 主分类号： C22C38/00
- IPC分类号： C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/08 ; C22C38/14 ; C22C38/16 ; C21D8/06 ; C21D9/52
摘要：
A rolled steel wire or rod suitable for the production of cold headed products without the application of heat treating operations has a chemical composition, by weight, of:
0.04% ≤ C ≤ 0.1%
1.8% ≤ Mn ≤ 2.0%
0.15% ≤ Si ≤ 0.30%
S ≤ 0.025%
P ≤ 0.025%
Cr ≤ 0.50%
Mo ≤ 0.08%
Ni+Cu ≥ 0.30%
0.01% ≤ Al ≤ 0.05%
V ≤ 0.05%
10 ppm ≤ B ≤ 30 ppm
N ≤ 100 ppm
Ti ≥ 0.06%
the remainder being iron and impurities resulting from the production process. The steel has a cementite-free microstructure comprising a predominant phase, a minor phase and MX-precipitations distributed within the predominant phase, the predominant phase consisting of bainitic ferrite, the minor phase comprising retained austenite and optionally martensite with a size of 2 to 3 µm, the relative amount of the minor phase amounting to
0.04% ≤ C ≤ 0.1%
1.8% ≤ Mn ≤ 2.0%
0.15% ≤ Si ≤ 0.30%
S ≤ 0.025%
P ≤ 0.025%
Cr ≤ 0.50%
Mo ≤ 0.08%
Ni+Cu ≥ 0.30%
0.01% ≤ Al ≤ 0.05%
V ≤ 0.05%
10 ppm ≤ B ≤ 30 ppm
N ≤ 100 ppm
Ti ≥ 0.06%
the remainder being iron and impurities resulting from the production process. The steel has a cementite-free microstructure comprising a predominant phase, a minor phase and MX-precipitations distributed within the predominant phase, the predominant phase consisting of bainitic ferrite, the minor phase comprising retained austenite and optionally martensite with a size of 2 to 3 µm, the relative amount of the minor phase amounting to
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