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Gas Pipe Carbon Seamless Steel Tube Whosale hot rolled large diameter carbon steel seamless pipe tube in china Carbon seamless steel pipe oil pipe ASTM A106 ASTM A53 API 5L GR.B schedule 40 seamless welded mild steel tube carbon steel pipe used for oil and gas pipeline RHS ASTM A513 SS400 Q235 welded black square steel pipe Black Iron Square Steel Tube 20x20 25x25 40x40 50x50 For Construction Carbon seamed steel pipe ASTM A53 DN600 a106 20 inch 14 inch erw welded round tube 22 inch carbon steel pipe ASTM A335 P11 seamless carbon steel pipe GOST ASTM A106 20# SAE1020 SCH40 mild steel pipe Q235 Q195 ST52 SS400 SS420 seamless Steel Pipe low carbon steel tubing pipe gi pipe galvanized steel pipe price