发明名称 |
HOCHFESTE HEISSTAUCHZINKBESCHICHTETE STAHLPLATTE MIT HERVORRAGENDEN DUKTILITÄTSEIGENSCHAFTEN UND VERFAHREN ZU DEREN HERSTELLUNG |
摘要 |
A steel sheet having a composition comprising C: 0.05-0.20 mass %, Si: 0.3-1.8 mass %, Mn: 1.0-3.0 mass %, Fe of the balance and inevitable impurities is subjected to a primary step of primary heat treatment and subsequent rapid cooling to Ms point or lower, a secondary step of secondary heat treatment and subsequent rapid cooling, and a tertiary step of galvanizing treatment and rapid cooling, so as to turn the structure of the steel sheet into a composite structure of 20% or more by volume of tempered martensite, 2% or more by volume of retained austenite, ferrite and a low-temperature transformation phase. A galvanized layer is deposited on the surface of the steel sheet. It is preferred to cool the steel sheet to 300 DEG C at a cooling rate of 5 DEG C/sec. or more after the galvanizing treatment. After the galvanizing treatment, alloying treatment may be conducted. |
申请公布号 |
DE60025711(D1) |
申请公布日期 |
2006.04.13 |
申请号 |
DE2000625711 |
申请日期 |
2000.04.19 |
申请人 |
JFE STEEL CORP., TOKIO/TOKYO |
发明人 |
KOBAYASHI, TECHNICAL RESEARCH LABS.;SAKATA, TECHNICAL RESEARCH LABORATORIES;SHINOHARA, MIZUSHIMA WORKS |
分类号 |
C22C38/00;C21D1/18;C21D1/78;C21D8/02;C21D9/46;C22C38/02;C22C38/04;C22C38/38;C23C2/02;C23C2/26;C23C2/28;C23C2/40 |
主分类号 |
C22C38/00 |
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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