鋼材の疲れ強さにおよぼす亜硫酸ガス雰囲気の影響

概要

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It is well known that the fatigue strength of steels is decreased by oxygen and/or humidity in the atmospheres. Only few reports have been published, however, on the effect of impurities such as SO_2 gas on the fatigue strength of steels. In order to study the effect of SO_2 gas on fatigue strengths of steels, rotating bending fatigue tests of a mild steel, a 60kg/mm^2 and an 80kg/mm^2 high strength steels and an 18-8 stainless steel have been corried out in various atmospheres. The employed atmospheres are air, humidified air, dry SO_2 gas, mixed gas of dry SO_2 and humidified air, mixed gas of dry H_2S and humidified air, H_2O, and H_2SO_4. On the fatigue strength of the mild steel the influence of dry SO_2 gas is not recognized, but the influence of mixed gas of dry SO_2 gas and humidified air is detected. The degree of the influence, however, is almost the same as that in humidified air. Therefore the influence of SO_2 gas on fatigue strength of the mild steel seems to be little, but some influences of SO_2 gas can be surmised from the characteristic aspect of fractured surfaces. On the 60kg/mm^2 and 80kg/mm^2 high strength steels and the 18-8 stainless steel the influence of SO_2 gas is not observed. For all the steels tested in this experiment, the influence of H_2SO_4 is very conspicuous.
社団法人日本鉄鋼協会の論文
1973-12-01