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五、应力腐蚀开裂如前所述,铁素体不锈钢一般是可免于氯化物应力腐蚀开裂的,但是这一特性在几种情况下可能受到损害。当铁素体不锈钢含有碳化铬沉淀物,周围被贫铬区环绕时,它们不仅在155℃的MgCl_2试验中会变得易遭受应力腐蚀开裂,而且在温度较低的各种NaCl试验中也是如此。从这表5中可以看出:446型铁素体不锈钢敏化处理后,以及因含碳量而不合格的29Cr-4Mo铁素体不
V. Stress Corrosion Cracking As mentioned above, ferritic stainless steels are generally free from chloride stress corrosion cracking, but this feature can be compromised in several situations. When ferritic stainless steels contain chromium carbide precipitates and are surrounded by a chromium-depleted zone around them, they not only become susceptible to stress corrosion cracking not only in the MgCl 2 test at 155 ° C, but also in various NaCl tests at lower temperatures . It can be seen from Table 5 that after the sensitization treatment of Type 446 ferritic stainless steel and the failure of 29Cr-4Mo ferrite due to the carbon content