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发表于 2018-4-27 10:01:54
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你看看英文版的描述: QW-407.2 A change in the postweld heat treatment (see QW-407.1) temperature and time range
The procedure qualification test shall be subjected to PWHT essentially equivalent to that encountered in the fabrication of production welds, including at least 80%
of the aggregate times at temperature(s) . The PWHT total time(s) at temperature(s) may be applied in one heating cycle.
±10与±14没有本质区别; 至少80&是直接规定的,因此你那个200min-150min也合适。虽然标准说可以覆盖,但是我个人觉得你还是按照(930±20)℃×150min比较稳妥些,毕竟时间差的多,尤其牵涉到保温这方面,宁可小心点。 |
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