1. Available for Various Specifications. 2. Strict Quality Control. 3. Fast Delivery of Time. China Construction (Beijing) Pipe Co.,Ltd mainly manufactures: Steel Pipe, Pipe Fitting and Anticorrosion Processed steel Pipe. StandardAPI5L,A106,A53,A335,A333,DIN1629,DIN2448,NFA49,GOST8731,JISG3454GradeGR.B,X42,X56,P11, P22,ST37,ST45.8,ST52,S235JR,S355JR,STP430OD1/4"-32"WTSch10-Sch160(1.5mm-80mm) ...