耐熱ステンレス鋳鋼の高温強度について

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We cast keel test blocks corresponding to 18-8 system austenite stainless steels used for large turbine castings-AISI 304, VIS 31, AISI 347, 316 Cb and 321-, and investigated mainly into the high temperature properties of these test blocks. The results obtained are as follows : (1) Room temperature strength of the steel VIS 31 is slightly inferior to the others'. Ductility of the steel 304 is the highest, followed by the others' in the order of the steel VIS 31, 321, 347, and it is the lowest in the steel 316 Cb. (2) Short time strength of the steel VIS 31 at 650℃ is a little inferior to the others' and ductility of the steel 316 Cb at 650℃ is the lowest among the tested steels. (3) The ranking in rupture strength at 650℃ is in the order of 347, 316 Cb, VIS 31, 321, and the steel 304 is the lowest. As compared mechanical properties of castings with properties of wrought steel materials corresponding to these cast steels, room temperature and short time high temperature strengths of castings are lower by about 5 kg/mm^2 than those of wrought steel materials. Also ductilities of the former are about 10 % inferior to those of the latter. Rupture strength at 650℃ of the former is either equal to or a little inferior that of the latter. These castings pass through JIS corrosion resistant specification for wrought steel materials. When we compared the influence of water toughning or air cooling on the strength or the ductility in room and elevated temperatures of cast materials and corrosion resistant properties of theirs, we could no find any remarkable differences between them. Therefore, we could confirm the fact that the post-annealing of large and complicated castings as turbine castings permits of air cooling.
社団法人日本材料学会の論文
1961-03-15

耐熱ステンレス鋳鋼の高温強度について

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