... can do it! ! Hebei Xinyuan Thai Steel Pipe in Oil and Natural Gas of qualified suppliers ... 16MN X grade steel B Grade Steel L grade steel Q235 Q345 K55 J55 in April of this ... 2010 price high quality Xinyuantai SteeI Tube GrouptypeSeamless steel pipematetialJ55, K55, N80, Q345, 10#,20#, ... 140mm-273mmwall thicknesssch5s,sch10,sch20,sch30,sch40s,STD,sch60,sch80s,XS,sch80,sch100,sch140,sch160,XXSstandardBS ...