发明名称 |
METHOD FOR PLATING MANDREL BAR WITH Cr AND PROCESS FOR PRODUCING SEAMLESS PIPE USING THE METHOD AND THE MANDREL BAR |
摘要 |
<p>By using a plating bath containing chromic acid: 100 to 250 g/L, sulfate radical: 3.0 to 5.5 g/L, and a catalyst: 100 to 200% (a weight ratio to the chromic acid content) for conducting electroplating, a Cr-plating film which has an increased film crack density is formed on the surface of a mandrel bar base metal, whereby peeling-off of the Cr-plating film can be suppressed in mandrel mill rolling for extending the service life of the mandrel bar.</p> |
申请公布号 |
EP2281642(B1) |
申请公布日期 |
2014.12.17 |
申请号 |
EP20090725416 |
申请日期 |
2009.03.18 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
HIRASE, NAOYA;KIMOTO, MASANARI |
分类号 |
B21B25/00;C25D7/00 |
主分类号 |
B21B25/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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