发明名称 |
STEEL FOR MECHANICAL STRUCTURE EXCELLING IN STRENGTH, DUCTILITY AND TOUGHNESS AND PROCESS FOR PRODUCING THE SAME |
摘要 |
<p>A steel for mechanical structure with an excellent balance of strength, elongation and toughness surpassing that of maraging steel; and an application product thereof. There is provided a steel for mechanical structure excelling in strength, ductility and toughness characterized in that its component formulation is composed of, by mass percentage, more than 0.30 to 0.5% C, 1.0% or less Si, 1.5% or less Mn, 0.025% or less Al, 0.3 to 0.5% Mo, 0.0005 to 0.01% B and the balance Fe and unavoidable impurities, and that the structure thereof at a volume ratio of 90% or greater consists of martensite structure whose constituent blocks are 1.5 µm or less in size, and that the ratio of solid solution B is 0.0005% or greater and is present on old austenite grain boundaries in an amount of at least 1.5 times that within old austenite grains.</p> |
申请公布号 |
WO2007004707(A1) |
申请公布日期 |
2007.01.11 |
申请号 |
WO2006JP313521 |
申请日期 |
2006.06.30 |
申请人 |
JFE STEEL CORPORATION;MARUTA, KEIICHI;HAYASHI, TOHRU;KUROSAWA, NOBUTAKA;KIMURA, HIDETO;TOYOOKA, TAKAAKI;HASE, KAZUKUNI;YAMADA, KATSUMI |
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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