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| EFFECT OF STRENGTH ON SCC SUSCEPTIBILITY OF STEEL 34CrNi3Mo IN NaOH SOLUTION |
| ZHENG Wenlong; CAI Anding; ZHU Guopei (Shanghai Research Institute of Materials) |
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Cite this article:
ZHENG Wenlong; CAI Anding; ZHU Guopei (Shanghai Research Institute of Materials). EFFECT OF STRENGTH ON SCC SUSCEPTIBILITY OF STEEL 34CrNi3Mo IN NaOH SOLUTION. Acta Metall Sin, 1983, 19(2): 58-65.
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Abstract The stress corrosion cracking (SCC) susceptibility of steel 34CrNi3Mo with different yield strength grades in 30% NaOH aqueous solution at 80℃ has been examined by the measurement of their K_(ISCC) either at open circuit potential (-1050mV) or cathodically polarized at-1400mV (SCE). It is shown that the SCC under the open circuit potential condition is of a strain generated active path corrosion (SGAPC) type, and under the cathodically polarized condition is of a hydrogen embrittlement (HE) type. With the increasing of the yield strength of the steel, the K_(ISCC) is increased under the open circuit condition, and sharply decreased under the cathodically polarized condition. For HE type, the reducing the strength of steel may effectively decrease the SCC susceptibility; while, for SGAPC type, it may increase the SCC susceptibility. Thus, the usual understanding of the effect of the strength on SCC susceptibility arrived from the tests of high strength steels in aqueous solution seems not to be suitable to those SCC of SGAPC type.
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Received: 18 February 1983
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