高温用鋼管材料の高温強度

概要

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The creep rupture strength and metallurgical microstructures of tube and pipe steels used for high-temperature and high-pressure service were investigated. A total of 127 kinds of test materials were selected from 17 groups of carbon steel, low alloy steel or austenitic stainless steel. The test specimens were taken from the wall of the tubes and pipes which were commercially produced in our tubing plant. The average creep rupture strength of each steel was obtained from the creep rupture test performed for the period longer than 10 000 hrs with a multiple-type testing machine. The metallurgical microstructures after the creep rupture test were investigated by optical- and electron-microscopy as well as X-ray and chemical analyses of the extracted residues. The results obtained were used to discuss the relations between creep rupture strength and microstructures. In carbon steel, active N and Mn are effective for strengthening but C and pearlites of both lamellar and spheroidal types are not so effective at high temperatures in an extended time. In low alloy steel, the carbide distributions and carbide types play important roles in the strengthening. MC carbide in austenite stainless steel increases the creep rupture strength but at high temperatures this effect disappears.
社団法人日本材料学会の論文
1973-03-15