Features:  β-type titanium alloy, Ti-22V-4Al, which has ² High strength ² High elasticity ² Good corrosion resistance ² Excellent biocompatibility,  ² Excellent formability in the solution treated condition ² More suited for eyeglasses frame. 1.Chemical Composition(wt%)BrandNCHFeOAlVTiT422≤0.05≤0.10≤0.015≤1.00≤0.203.50~4.5020.00~23.00Bal 2. Mechanical propertiesHeat treatmentTensile strength(N/mm2)0.2%Yield strength(N/mm2)Elongation(%)Reduction ofArea(%)Hardness(HB)Solution≥640≥540≥10≥55≥220STA≥980≥880≥7≥20≥350 3. Physical PropertiesGravityLinearexpansioncoefficient(/℃)SpecificHeat(cal/gr/℃)ThermalConductivity(cal/cm2/sec/℃/cm)ElectricResistance(μΩ-cm)Young’sModulus(kg/mm2)4.698.0*10-60.130.0161488160 4. Size Variation and Out-of-Round TolerancesDiameter,(mm)Size Variation,(mm)Out-of-Round,(mm)> 1.0 to 2.0 inclusive±0.020.02> 2.0 to 4.0 inclusive±0.030.03>4.0 to 8.0 inclusive±0.040.04