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API K55 oil pipe carbon steel tube carbon steel pipe for construction seamless steel tube S275JR S355JR 2'' hot dipped galvanized corrugated metal culvert steel pipe black carbon pipe for Compressed Air carbon steel seamless water pipe seamless steel pipe astm a106 iron black steel tube Professional Q235/A36 Carbon Steel Square Pipe ASTM A36/A53 sch40/sch80 mild steel pipe Q235 Q195 ST52 SS400 SS420 seamless Steel carbon round seamless/welding steel tube high precision bright surface thick wall seamless tube ID 4.4mm, 5.4mm airgun barrel tube GOST 8732-78 certification ST37 TS44 ST52 16Mn Q235 Q195 S355JR SS400 SS420 seamless Steel Pipe low carbon steel tubing pipe