Annealed, normalized, normalized and tempered Inspections and tests performed Chemical composition inspection, mechanical properties test¡ê¡§tensile strength, yield strength, elongation, flaring, flattening, bending, hardness, impact t surface and dimension test, non-destructive test, hydrostatic test. Surface treatment Oil, varnish, passivation, phosphating, shot blasting Size range O.D 8-168.3mmw.T 1-15mm - Bundle packing , crate packing , customized