1.API 5L Seamless Steel Pipe 2.Competitive price and strict quality control 3.Good reputation ... : Grb X42 X52 4.Standard: ASTM ,BS,DINSeamless Steel Pipe for Structure(steel pipe,steel tube) Model no.: ASTM A106 Grade A/B, API 5L, ... X52, X42, ST52, K55, STK490, We can supply pipes for usual ...