25 Cr-28 Ni オースナイト耐熱鋼について

概要

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In order to develop high strength austenitic hear resisting steel, the creep-rupture and metallo graphia data are presented on 25% Cr-28% Ni steels. The individual and combined effects of C, N, Mo, W, V, and B have been studied in detail. Some of the steels tested with high N content are prepared using a melting and casting technique under high-pressure nitrogen atmosphere. Of the 25% Cr-28% Ni steels tested two compositions 2 Mo-5.7 W-0.6 N-0.05 B and 1.6 Mo-2.2 W-0.3 N are shown to give good combination of properties. The former possesses very high 1 000 hr creep rupture strength, that is 26.5 kg/mm^2 at 700℃. The latter possesses strength of 23.0 kg/mm^2, and shows no abnormal drop in the rupture strength even after the test period of 20 000 hr at 700℃. This property together with ease of hot-rolling and forging make this steel very attractive for high strength applications at elevated temperature.
社団法人日本材料学会の論文
1971-03-15