发明名称 |
PROCEDE DE CARBONITRURATION BASSE PRESSION, A GRADIENT REDUIT DE TEMPERATURE DANS UNE PHASE DE NITRURATION INITIALE |
摘要 |
<p>The invention relates to a method for the low-pressure carbonitriding of steel parts, in particular parts used in the manufacture of automobiles, comprising: a heating step that includes a simple heating phase (M) followed by an initial nitridation phase (Ni) from a temperature between 700°C and 750° C to a temperature between 860° C and 1000° C and is carried out using a reduced temperature gradient relative to the simple heating phase; and alternate cementing (C1-Cn) and nitridation (N1- Nn) steps at constant temperature; wherein the final nitridation step is accompanied with a decrease in temperature immediately before a quenching step (T).</p> |
申请公布号 |
FR2981948(B1) |
申请公布日期 |
2014.01.03 |
申请号 |
FR20110059877 |
申请日期 |
2011.10.31 |
申请人 |
PEUGEOT CITROEN AUTOMOBILES S.A.;ECM TECHNOLOGIES |
发明人 |
LAPIERRE PHILIPPE;LARDINOIS JEROME;GIRAUD YVES;RALLO ALFRED |
分类号 |
C23C8/34;C21D1/78;C22C38/00 |
主分类号 |
C23C8/34 |
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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