SEAMLESS STEEL PIPE GR.B, X42, X52, X60,X65,X70,X80 API 5L / ASME B36.10 / ASTM A106B /NACE MR1075 SIZE: 1/4" - 24" SEAMLESS pipe is mainly used for pipeline such as o, petroleum, ore slurry, steam heating system and boiler pipe, chemical industrial.