塩化物水溶液によるオーステナイトステンレス鋼の応力腐食割れについて

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タイトル別名
  • Stress Corrosion Cracking of Austenitic Stainless Steels in Chloride Solutions
  • エンカブツ スイヨウエキ ニ ヨル オーステナイトステンレス コウ ノ オウリョク フショク ワレ ニ ツイテ

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An investigation was carried out on the effect of stress, chloride concentration, temperature and oxygen on the stress corrosion cracking behaviour of 18-8 and 18-13 Mo steels. Tests were made in autoclaves with the chloride ion concentration of 0∼300,000 ppm at 130°∼250°C. The susceptibility for stress corrosion cracking was found to increase with the increase of chloride concentration and/or temperature. At temperatures blow 150°C, no stress corrosion cracking was observed except in boiling 42%MgCl2 solution. Above 180°C, susceptibility was much greater in vapor phase than in liquid phase. In the atmosphere of air 18-8 steel cracked at 180°C with 30,000 ppm chloride concentration in liquid phase and 30 ppm in vapor phase, wherease at 250°C it cracked with 10 ppm chloride concentration in vapor phase. Addition of oxygen in autoclaves promoted the tendency to stress corrosion cracking; at 180°C 18-8 steel cracked with 300 ppm chloride ion concentration in liquid phase and 10 ppm in vapor phase.<BR>The 18-13 Mo steel was observed to be more susceptible than 18-8 steel in vapor phase and less susceptible in liquid phase in dilute chloride solution, whereas in boiling 42%MgCl2 solution both steels were almost equally susceptible. These results suggested the pressence of definite threshold stresses for stress corrosion cracking which depended on chemical composition and corrosive environments such as temperature, chloride and oxygen concentrations. It was also observed that in dilute chloride solutions all cracks were originated at pits formed in both vapor and liquid phase and that complete exclusion of oxygen eliminated the occurrence of stress corrosion cracking as well as pitting corrosion.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 27 (11), 530-534, 1963

    公益社団法人 日本金属学会

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