Steel Pipe, Greenhouse, Container House manufacturer / supplier in China, offering API 5L Psl2 X65 X70 X60 X52 Pipeline and Steel Pipes, Black Coating Seamless Steel Tubes X52 X60 X70 Psl2 API 5L, Fbe Coating Seamless Steel Pipes X70 X65 X60 X52 Psl2 API 5L and so on.