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S235JR,S235JO,S235J2,SS330,SPHC, S185 ASTM A53 Hollow Section Square Pipe Feature: Standard: API 5L/ASTM A523/ASTM A252/GB-T8711/BS 6363 etc Material: S235JR,S235JO,S235J2,SS330,SPHC, S185,CS Type B ...