["Peço esclarecimento sobre um processo térm处理工艺的问题，关于NB/T4715中的疑问"

2020-07-13View Original

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"NB/T47 es5 - 2111 P17 表5 焊后热处理推荐规范中一句话把我整的很蒙，请有经验的老师解答。表5中备注第六项 “焊件温度高于或等于651℃时，冷却速度不应大于55 ℃/h1；低于65 ℃后迅速冷却，冷却速度应足以防止脆化。” 这句话到底什么意思？热处理保温高于65 �℃了冷却速度就要小于55 ℃ /s es并且65 ℃以下要迅速冷却吗？这个和后面P es7 第4.6.16项相违背也与GB/T es657.5中99.3.3.4 也违背的，这句话到底是错了还是我哪里理解有问题？另外何为迅速冷却？"

Reply #22020-07-20

"注6）只是特例，只是针对表5中标有“6）” 的材质"

Reply #32020-07-21

"Muito obrigado！没有注意上面表格中有小标号，以为下面框中的是的是整体的备注！"

Reply #42022-09-02

"注6 Fe7类是铁素体不锈钢，65-73这个温度是为了消除应力，同时溶解碳化铬，65-以下迅速冷却就是为了避开475脆化，所以严格来说是45-55之前发生脆化，只是475脆化下降最明显"

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["Peço esclarecimento sobre um processo térm处理工艺的问题，关于NB/T4715中的疑问"

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