| Original document(14 pages) Authorized document(14 pages) 中文版 |
The present invention relates to a cylindrical pipe with internal hardened layer, its production method and special-purpose equipment. Said cylindrical pipe has small wall thickness and long length, its pipe wall has internal layer and external layer with different hardness, the hardness of its internal layer is greater than that of external layer, and said pipe is applicable for conveying material with high frictional coefficient. Its production method adopts the mode utilizing frequency to control pipe movement and proper hardening temp. range, and is special-purpose equipment is simple in structure, stable in operation, and can accurately control hardening temp., pipe moving speed nad depth of hardened layer. |
Application Number
申请号 |
03111908 |
Application Date
申请日 |
2003.02.24 |
| Title 名称 |
Cylinder shape pipe piece with inner harden layer and production method and equipment |
Publication Number
公开号 |
1433942 |
Publication Date
公开日 |
2003.08.06 |
| Approval Pub. Date |
|
Granted Pub. Date |
2005.02.23 |
| International Classification 分类号 |
C21D1/10,C21D9/08,F16L57/06 |
Applicant(s) Name
申请人 |
Wang Kefa |
| Address 地址 |
037036 |
| Inventor(s) Name 发明人 |
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| Attorney & Agent 代理人 |
zhao xiaoyun |
| More information 更 多 信 息 |
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