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DIN EN10016- 2 AISI ASTM A106 A53 SCH80 Q235 Q355 S235jr S355j0 S355j2 Ordinary Straight Seamless Carbon Welded Steel Pipes Factory direct erw ASTM A53 round rectangular steel pipes hollow tube Pipe Tube Carbon Steel API5L PSL2 Fluid Seamless Round ASTM Hot Rolled Carbon Black Pipes Dn 40 1.5mm 6m Free sample cold rolled Q235 Q275 S355hot quality carbon steel seamless pipe tube carbon steel pipe fittings 16 inch schedule 40 galvanized steel pipe Carbon seamless black steel pipe High Quality ERW Steel Pipe,ERW Seamless Carbon Steel Pipe For Waterworks China Black Square Steel Pipe Seamless Black Steel Tube Rectangular Carbon Hollow Section Tube 
