Production Standard, Grade, Steel No: ASTM A106 Grade A, B, C ASTM A53 S Grade A, BGB/ T8 163 10, 20, Q295, Q345Delivery Condition: Annealed, Normalized Inspection and Test: Chemical Composition Inspection, Mechanical Properties Test( Tensile Strength, Yield Strength, Elongation, Flaring, Flattening, Bending, Hardness) , Surface and Dimension Test, No-destructive Test, Hydrostatic Test. Surface treatment: Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting