보일러용 재료인데, 어떤 재료의 경우 용접 평가 시 충격 시험을 해야 하는지 문의드립니다.
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보일러용 재료 15CrMoG 12Cr1MoVG SA213T91 SA213T92, SA335P91 SA335P92, 위의 어떤 재료를 용접 평가할 때 충격 시험을 해야 하는지 문의드립니다.
냄비 규격 P20 4.3.2.2 참조
궈규는 무엇의 약자인가요?대신님, 감사합니다.
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