Seamless Steel Pipe, Boiler Tube, Alloy Steel Pipe manufacturer / supplier in China, offering Russia Standard GOST 8731-74 / 8732-78 Standard Hot-Rolled Seamless Carbon Steel Pipe, API 5L Grade B Seamless Steel Pipe Beveled Ends for Oil & Gas, 2 Inch Q235 Pre Galvanized ERW Steel Pipe BS1387 ASTM Threaded Grooved Painted and so on.