... & THK > 0.5mm; 2) Tight tolerance, Smooth surface, Uniform mechanical property(Mechanical Properties equilibrium); 3) Heat treatment: BK, BKS, GBK, NBK, Stress Relief ... . 8) Relevant Test: Chemical Component Analysis, Mechanical Properties(Ultimate tensile strength, Yield strength, Elongation), Technics Properties(Flattening Test, Flaring Test, Bending Test, Hardness ...