发明名称 |
STEEL FOR MECHANICAL STRUCTURE EXCELLING IN STRENGTH, DUCTILITY AND TOUGHNESS AND PROCESS FOR PRODUCING THE SAME |
摘要 |
A steel for machine structural use with a better strength-ductility-toughness balance than maraging steel and applications thereof are provided. The steel for machine structural use with excellent strength, ductility, and toughness contains, in percent by mass, more than 0.30% to 0.5% of carbon, 1.0% or less of silicon, 1.5% or less of manganese, 0.025% or less of aluminum, 0.3% to 0.5% of molybdenum, and 0.0005% to 0.01% of boron, and the balance is iron and incidental impurities. The steel has a structure including at least 90% by volume of martensitic structure. The martensitic structure includes blocks having a size of 1.5 µm or less. Dissolved boron is contained in an amount of at least 0.0005% and is present at boundaries of prior austenite grains in a concentration at least 1.5 times that in the prior austenite grains.
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申请公布号 |
EP1900838(A1) |
申请公布日期 |
2008.03.19 |
申请号 |
EP20060780846 |
申请日期 |
2006.06.30 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
MARUTA, KEIICHI;HAYASHI, TOHRU;KUROSAWA, NOBUTAKA;KIMURA, HIDETO;TOYOOKA, TAKAAKI;HASE, KAZUKUNI;YAMADA, KATSUMI |
分类号 |
C22C38/00;C21D9/40;C21D9/46 |
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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