微量の Ti と Nb 添加による 304 型ステンレス鋼の高温強度の改善

概要

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A heat of type 304H steel which shows the highest creep-rupture strength in the tests of our laboratory has considerably high creep-rupture strength at long times and seems to have even higher strength than that of type 316H steel. If such 403H steel is always available, the profit would be expected very much to reduce the construction cost of boiler plants. The difference of the strength in commercial heats can be explained by that of the electron microscopic structure, showing that the heat of higher strength has very fine and good distribution of M<23>C_6 type carbides and they have a resistance to coalesce to longer times-due to the presence of small amounts of titanium and niobium. An experimental heat of type 304 steel containing 0.16% C, 0.10% Ti and 0.15% Nb had much higher creep-rupture strength than that of type 316H steel and showed itself to be very much economical new stainless steel for high temperature use. And also it was found that at C/(Ti+Nb) atomic ratio of about 4 the maximum high temperature strength is obtained and precipitated carbides distribute themselves very finely and uniformly.
社団法人日本鉄鋼協会の論文
1968-12-01