オーステナイト系ステンレス鋼絞りきょう体の環境割れ特性

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  • Environmental cracking characteristics of deep-drawn austenitic stainless steel cases.
  • オーステナイトケイ ステンレス コウシボリ キョウタイ ノ カンキョウ ワレ

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Environmental cracking tests for deep-drawn austenitic stainless steel cases were carried out in standing water in a manhole and under accelerated conditions, to test for hydrogen embrittlement. The main results are as follows.<br>(1) 8.6% and 9.1% Ni austenitic stainless steel cases with a sacrificial zinc electrode became cracked after setting for several months in standing water in a manhole. The electrochemical condition was -790mV at the lowest electrode potential, and a current density of 50mA/m2.<br>(2) 8.6%, 9.1% and 10% Ni austenitic stainless steel cases became cracked under accelerated conditions, to test for hydrogen embrittlement. The electrochemical conditions were the same for those cases with a sacrificial zinc electrode in sea water. However, 12% Ni austenitic stainless steel case did not become cracked under these conditions.<br>(3) Susceptibility to hydrogen embrittlement depended on the ratio of residual stress to tensile strength, and on martensite content. Thus, the cracking probability of deep-drawn cases in this environment could be estimated.<br>(4) Stable austenitic stainless steel cases did not became cracked after more than 7 years in these manholes.

収録刊行物

  • 材料

    材料 39 (439), 432-437, 1990

    公益社団法人 日本材料学会

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