... machined (black surface after Q/T)+ Turned (optional) 5. Forged ratio: No less than 3: 1 6. Technical Data: ... mechanical property (yield strength, tensile strength, elongation and hardness), forged ratio, UT test result, Grain size, heat treatment methods and ... Will be cold stamped and Steel grade, diameter (mm), length (mm), and the manufacturer LOGO and weight (kg) is painted. forged steel round bar