용접봉(오312, 결422, 열317, 결507) 각각이 무슨 뜻인가요?앞에 있는 남자는 무엇을 의미하나요?
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용접봉(오312, 결422, 열317, 결507) 앞에 붙은 한자들은 무엇을 의미하나요?각각 무슨 뜻인가요?
오스테나이트계 스테인리스강, 탄소구조용강, 내열강, 알겠습니까.
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