发明名称 |
Corrosion resistant steel components and method of manufacture. |
摘要 |
<p>A non-alloy steel component is nitrocarburized at 550 to 720°C for up to 4 hours in a nitriding gaseous atmosphere eg. ammonia or ammonia and endothermic or exothermic gas, and is thus exposed to an oxidising atmosphere for 2 to 120 seconds to form an oxide-rich layer thereon before being quenched into an oiltwater emulsion, degreased and a tack-free wax coating applied. Alternatively, the component may be cooled in an oxidising atmosphere and then wax coated or it may be cooled in a non-oxidising atmosphere and then reheated to provide the oxide-rich surface layer before being cooled again and wax coated. As a further alternative, the component may be cooled, lapped to a surface roughness of not more than 0.2 micrometres Ra, reheated to oxidise and then quenched. These techniques give a good corrosion resistance to the component.</p> |
申请公布号 |
EP0077627(A2) |
申请公布日期 |
1983.04.27 |
申请号 |
EP19820305400 |
申请日期 |
1982.10.11 |
申请人 |
LUCAS INDUSTRIES PUBLIC LIMITED COMPANY |
发明人 |
DAWES, CYRIL;SMITH, JOHN DAVID |
分类号 |
C21D1/72;C21D9/00;C23C8/26;C23C8/32;C23C8/34;C23C8/80;(IPC1-7):23F7/04;23C11/14 |
主分类号 |
C21D1/72 |
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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