Carbon Steel Pipe, Stainless Steel Pipe, Copper Nickel Tube manufacturer / supplier in China, offering ASTM A179/A179m Seamless Lowcarbon Steel Heat Exchanger Tubes, ASTM B111 C12000 C12200 Seamless Pure Copper Pipe Brass Copper Tube, Carbon Welded Pipeline Steel Pipes API 5L X52 Psl1/Psl2 for Natural Gas Industries and so on.