鋼材溶接継手のH<sub>2</sub>SおよびCO<sub>2</sub>ガス環境中における腐食疲労強度

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  • Corrosion Fatigue Strength of Steel Welded Joints in H<sub>2</sub>S and CO<sub>2</sub> Gas Environments
  • 鋼材溶接継手のH2SおよびCO2ガス環境中における腐食疲労強度
  • コウザイ ヨウセツ ツギテ ノ H2S オヨビ CO2 ガス カンキョウチュウ

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In order to clarify the influence of H2S and CO2 gas environments on fatigue strength of steel welded joints, corrosion fatigue tests were carried out in {H2S gas (5000ppm)+humid air (80°C, 90% relative humidity)} and 99.9% CO2 (80°C, 90% relative humidity) gas environment by use of the laboratory made gas corrosion fatigue testing apparatus. Fatigue strength of T type welded joints of AISI 410 and AISI 4330 steel at 107 cycles in {H2S (5000ppm)+humid air (80°C, 90% relative humidity)} was 32 and 43 percent lower than that in air, respectively. The reduction of fatigue strength of AISI 410 T type welded joint in 99.9% CO2 (80°C, 90% relative humidity) gas environment was 50% at 107 cycles. While, the influence of humid CO2 gas on fatigue strength of AISI 4330 T type welded joint was slight at 107 cycles. The influence of H2S gas content on fatigue life was relatively remarkable in H2S gas content of 20 to 5000ppm. In humid H2S and CO2 gas environment corrosion pits were observed at the initiation region of the fracture surfaces of the both steels T type welded joints. Intercrystalline fracture was predominant at the propagation region of AISI 410 steel T type welded joint. While, striation was predominant at the propagation region of AISI 4330 steel T type welded joint. It may be concluded that the formation of corrosion pits at the initiation region of fracture surface is the major cause of fatigue strength decrease of these steel T type welded joints in a humid H2S and CO2 gas environment.

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