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1.Standard: ASTM A106/A53,API 5L,ASTM A179,ASTM A192,ASTM A252,DIN ST37,DIN ST35.8,DIN2448,DIN ST52,DIN17179,DIN ST44,St35.8,St45.8-I,St35.8,St45.8-III,BS1387-1985,ASTM A333,ASTM A335 2.Material: ASTM ...