| 发明名称 |
METHOD FOR SURFACE TREATMENT OF A MANDREL BAR |
| 摘要 |
<p>A method for surface treating a mandrel bar used for hot rolling of high-alloy seamless steel pipe is provided. The method includes heat treating the mandrel bar to develop a scale, and after heat treatment, rolling ordinary steel comprising 8 % or less of chromium for at least 50 passes. This achieves a mandrel bar for rolling high-alloy steel possessing both durability and superior resistance to seizure</p> |
| 申请公布号 |
EP2008731(A1) |
申请公布日期 |
2008.12.31 |
| 申请号 |
EP20070740114 |
申请日期 |
2007.03.28 |
| 申请人 |
SUMITOMO METAL INDUSTRIES LIMITED |
发明人 |
IIDA, SUMIO;HIDAKA, YASUYOSHI;YOSHIZAWA, MITSURU;NAKAIKE, KOJI |
| 分类号 |
B21B17/02;B21B17/04;B21B25/00;C23C8/10 |
主分类号 |
B21B17/02 |
| 代理机构 |
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