Other Oil Field Equipments ASTM A53 A106 Q235 Sch40 Schedule 80 탄소강 튜브 용접 파이프 이음매 없는/Gi/사전 탄소 Ms 연삭 용접 ASTM A106 Gr. B BS, DIN, GB, JIS St45 DN15 A333 A335
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