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SS400 Hot Rolled RHS steel tube ASTM Q235 Black Hollow Section Carbon Steel Pipe Seamless iron metal Square Carbon Steel Tube S355 weld carbon steel pipe carbon steel pipes round pressure rating schedule 80 steel pipe seamless mild steel pipe ASTM A53 grade B astm a35 carbon steel pipe Cold drawn seamless tube A519 AISI 8630 carbon steel pips carbon steel pipe fittings manufacture Steel Tube Grade 355 Carbon Steel Pipe High Quality ERW Seamless Carbon Steel Pipe API Compatible Drill and Oil Pipe for Waterworks 6m and 12m Lengths Available