... -destructive Test, Hydrostatic Test.Surface treatment:Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting2.Carbon Alloy Tube Application ... -destructive Test, Hydrostatic Test.Surface treatment:Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting. 4.Boiler Tube ... destructive Test, Hydrostatic Test.Surface treatment:Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting 5.Tube for Mechanical ...