ボイラ用炭素鋼および低合金鋼鋼管材のクリープ破断強度

概要

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Hereunder is presented the report of experimental studies that have been made in our labora-tory extending for a considerably long period of time, of the creep-rupture strength of boiler tube materials, i. e. of steels of 11 grades of carbon steel, molybdenum steel and Cr-Mo steels including even 9% Cr-1% Mo. The test samples were taken from at least 3 heats of each grade up to as many as 21 heats of 2.25% Cr-1% Mo steel. The main results obtained from these experiments are as follows. (1) Very small effect of conbon on carbon steel has been observed in the long time test at above 400'C for creep-rupture strength. (2) Similarly there has been but little difference in the creep-rupture strength of steels of 2 different 0.5% Mo grades with slightly different amount of carbon ingredient, in their long time test at above 450℃. These steels of variant molybenum grades occasionally showed very low values of rupture elongation, and had to be improved by addition of 0.5% Cr. (3) The steels of 2.25% Cr-1% Mo and of 5% C1-0.5% Mo showed low values of rupture strength at comparatively low temperature in 10^5 hr when fully annealed
社団法人日本材料学会の論文
1971-03-15