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2. 发明申请

WO1995018242A1 MARTENSITIC HEAT-RESISTING STEEL HAVING EXCELLENT RESISTANCE TO HAZ SOFTENING AND PROCESS FOR PRODUCING THE STEEL 审中-公开
标题翻译：具有优异耐腐蚀性的马氏体耐热钢和用于生产钢的工艺
公开(公告)号：WO1995018242A1
公开(公告)日：1995-07-06
申请号：PCT/JP1994002302
申请日：1994-12-28
申请人： NIPPON STEEL CORPORATION , FUJITA, Toshio , HASEGAWA, Yasushi , OHGAMI, Masahiro , MIZUHASHI, Nobuo , NAOI, Hisashi
发明人： NIPPON STEEL CORPORATION
IPC分类号： C22C38/28
CPC分类号： C22C38/22 , C21D6/002 , C21D8/0205 , C21D8/10 , C21D2211/008 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/40 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/52
摘要： A martensitic heat-resisting steel which contains on the mass basis 0.01-0.30 % of carbon, 0.02-0.80 % of silicon, 0.20-1.00 % of manganese, 5.00-18.00 % of chromium, 0.005-1.00 % of molybdenum, 0.20-3.50 % of tungsten, 0.02-1.00 % of vanadium, 0.01-0.50 % of niobium and 0.01-0.25 % of nitrogen, and further contains at least one element selected from the group consisting of 0.005-2.0 % of titanium, 0.005-2.0 % of zirconium, 0.005-2.0 % of tantalum and 0.005-2.0 % of hafnium, and wherein the total content of titanium, zirconium, tantalum and hafnium in the metallic component M of a carbide of M23C6 type is 5-65 %. The steel is produced by adding titanium, zirconium, tantalum and hafnium to a molten steel having the above-specified chemical composition during the period from 10 minutes before the completion of refining to the completion of refining, then casting and working the refined steel, subjecting the worked steel to solution heat-treatment, suspending the cooling step at 950 &tilde& 1,000 DEG C, and holding the steel thus treated at that temperature for 5-60 minutes. The obtained steel has an excellent resistance to HAZ softening and exhibits a high creep strength at a temperature as high as 550 DEG C or above.
摘要翻译：一种马氏体耐热钢，其质量含量为0.01-0.30％的碳，0.02-0.80％的硅，0.20-1.00％的锰，5.00-18.00％的铬，0.005-1.00％的钼，0.20-3.50 ％的钨，0.02-1.00％的钒，0.01-0.50％的铌和0.01-0.25％的氮，还包含至少一种选自钛的0.005-2.0％，钛的0.005-2.0％锆，0.005-2.0％钽和0.005-2.0％铪，并且其中M23C6型碳化物的金属组分M中的钛，锆，钽和铪的总含量为5-65％。该钢通过在完成精炼至精炼完成之前的10分钟内将钛，锆，钽和铪添加到具有上述指定化学成分的钢水中，然后铸造和加工精炼钢，加工钢进行固溶热处理，将冷却步骤悬浮在950℃和1000℃，并将该钢在该温度下保持5-60分钟。所获得的钢具有优异的耐HAZ软化性，并且在550℃以上的温度下表现出较高的蠕变强度。

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