... Coating:PE; 3PE; FBE; Black Tube,API 5L,ERW Pipe's Black Tube,API 5L,ERW Pipe's Specifications:1.Gradl: GR.B,X42 ... visual inspection, nondestructive inspection; SGS/BVBlack Tube,API 5L,ERW Pipe's Black Tube,API 5L,ERW Pipe's Available Designation: STANDARDGRADEAPPLICATIONAPI 5CTJ55,K55,N80Low ... ,Bridge Structure, Oil And Natural Gas Pressure Steel Tube etc.API 5LGR.B,X42/X46/X52/X56/x60/X70/X80ASTM ...