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12Cr1MoV 고압 이음새가 없는 합금 강철 보일러관
소음 17175 16Mo3 원활한 고압 합금강 보일러관
ASTM A335 합금강 이음매없는 파이프
15CrMo 원활한 합금강 파이프/튜브
GB 5310 20MNG 고압 심리스 보일러 튜브
ASTM A210 원활한 탄소강 보일러 파이프
ASTM A179 열교환기 튜브
GB3087 저압 보일러 원활한 강관
GB 5310 20G 고압 보일러 튜브
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