ステンレス鋼の常温大気中応力腐食割れに関する暴露試験結果と実験室的検討

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  • Weathering Test and Experimental Study on External Stress Corrosion Cracking of Stainless Steel
  • ステンレス コウ ノ ジョウオン タイキチュウ オウリョク フショク ワレ ニ

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Stress corrosion cracking (SCC) behaviors of type 304 stainless steel in a seashore atmospheric environment were investigated under three testing conditions; open air, transpalent plate covering, and steel plate covering. Wet and dry SCC tests, and half-immersion SCC tests were conducted experimentally to investigate the influence of temperature, humidity, pH, kind of salt and stress condition on SCC occurance. The following results were obtained: (1) SCC readily occurs more easily under the covering conditions than the open air condition, where rain rinses the surface of test pieces more often. The minimum value of the degree of sensitization, generating SCC susceptibility under the covering condition, was about 5% in terms of reactivation ration (JIS G 0580). (2) Temperature, humidity and hydroscopicity of salt, which influence the wet condition of steel surface, have an important effect upon SCC occurance. MgCl2, being very hydroscopic, tends to make a wet condition under which SCC is promoted. Sea salt containing MgCl2 also tends to make a wet condition. The critical temperature below which SCC dose not occur was estimated about 10°C.

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