Carbon Steel Pipe, Stainless Steel Pipe, Copper Nickel Tube manufacturer / supplier in China, offering API 5CT Grade J55/K55 JIS G3444 Stkm13b Seamless Steel Tube Oil Gas Casing Carbon Steel Pipe, En 10297-1 Seamless Steel Pipe for Mechanical/General Engineering Purpose, ASTM A182 F316 GOST 9940 - 81 Stainless Steel Welded Neck Flange Joint Fittings and so on.