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RHS ASTM A513 SS400 Q235 welded black square steel pipe Black Iron Square Steel Tube 20x20 25x25 40x40 50x50 For Construction EN 10025 S275JR HOT ROLLED STRUCTURAL NON-ALLOY CARBON STEEL FLAT BAR 40 X 6 MM X 6 M Carbon seamed steel pipe ASTM A53 DN600 a106 20 inch 14 inch erw welded round tube 22 inch carbon steel pipe High quality q235 hr carbon steel coil black iron hot rolled steel coil for buildings hot rolled carbon steel coil X42 steel strip 5mm 6mm 4 Gauge SAE 1006 1008 High Carbon Spring Steel Wire In Coils hot rolled carbon steel plate sheet s235 S355jr carbon steel coil Q195 Q215 Q235 Q255 Q275 Q355 Ss400 carbon steel Q195 Q235 Low Iron Wire Drawn Carbon Steel Wire With Stock For Nail Making