1)Standard: DIN17175,JISG3458, JISG 3467,GB5310,ASTMA335 2)Grade:20# ,45#,J55,N80, A53(A,B),A106(B,C)ST37, ... ,STS42,Q235,Q345ApplicaitionFluid transmission,Mechanical Structure,Hydraulic cylinder,Oil&Gas transport,SurfaceBare,Black,Oil Painting,3PE,2PE,FBE,Epoxy coatingInspectionWith Chemical Composition and ...