Carbon Steel Pipe, Stainless Steel Pipe, Copper Nickel Tube manufacturer / supplier in China, offering ASTM B111 C7100 C71500 C71520 Copper Welded Tube for Marine Condenser and Heat Exchanger, AISI 321 1.4541 Stainless Steel Seamless Tube for Heat Exchanger En 10216-5, API 5CT X52/X60 LSAW ERW Black Mild Carbon Steel Pipe for Oil and Structural Use and so on.