... bjsteelpipe DOT com Phone no: 0086-010-58200823-8009 SEAMLESS STEEL PIPEStandardAPI5L,A106,A53,A335,A333,DIN1629,DIN2448,NFA49,GOST8731,JISG3454GradeGR.B,X42 ... Piping,Oil,Gas ,Construction/Structural, Chemical, Electricpower,Transmission pipeline, Boiler pipe, heat exchanger pipe and Other Fields. 8000tons/month output astm 106,astm a53 Seamless Steel Pipe