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API 5L/ASTM A523/ASTM A252/GB-T8711/BS 6363 ERW Square Metal Pipes Feature: Standard: API 5L/ASTM A523/ASTM A252/GB-T8711/BS 6363 etc Material: S235JR,S235JO,S235J2,SS330,SPHC, S185,CS Type B ...