6Al-4V STA

6Al-4V STA

Ti 6Al-4V STA (Solution Treated and Aged) is a modified version of Ti 6Al-4V.  It is heat treated for high strength in sections under 4" thick.  Ti-6Al-4V has excellent hardenability in sections up to 1" thick with strengths as high as 165 ksi.  

For maximum strength: solution-treated and aged (STA) condition is: For sheet, 1675-1725°F 5 to 25 minutes, water quench. Age 975°F 4 to 6 hours, air cool. For bars and forgings, 1675-1725°F 1 hour, water quench. Age 975-1025°F 4 to 8 hours, air cool. 

Ti 6Al-4V STA is resistant to general corrosion but may be quickly attacked by environments that cause breakdown of the protective oxide. These include hydrofluoric (HF), hydrochloric (HCl), sulfuric and phosphoric acids. Inhibitors may help for the last three but not for HF. Ti 6Al-4V STA resists attack by pure hydrocarbons, and most chlorinated and fluorinated hydrocarbons (provided water has not caused formation of small amounts of HCl and HF). 

Chemistry

 AlVCNOHFeYOthers,
Each
Others,
Total
Ti
MIN 5.5 3.5 -- -- -- -- -- -- -- -- --
MAX 6.75 4.5 0.08 0.05 0.2 0.0125 0.3 0.005 0.1 0.4 Balance

Specifications

AMS 4965AMS 6930
EN 3.7164EN 3.7165
MIL-T-9046MIL-T-9047
UNS R56400
Werkstoff 3.7164Werkstoff 3.7165

Inventory

6Al-4V STA Round Bar

Common Trade Names

6-4 STA Titanium, 6-4 STA, Ti 6-4 STA

Features

  • High strength to 750°F
  • Excellent general corrosion resistance
  • High strength-to-weight ratio

Applications

  • Aerospace, turbine engine and airframe applications
  • Fasteners
  • Medical and dental implants
  • High performance Automotive

Physical Properties

Density: 0.160 lb/inch3
Melting Range: 2920 - 3020°F
Beta Transus: 1825± 25°F

Temperature, °F 70 200 400 600
Coefficient of Thermal Expansion, in/in°F x 10-6 - 5.3 5.4 5.5
Thermal Conductivity,
Btu • Ft/Ft² • Hr°F STA
4.0 4.3 5.2 6.1
Modulus of Elasticity,
psi X 106 STA
16.7 16.0 15.0 14.0

Mechanical Properties

Specified, STA sheet & plate

Tensile Strength, ksi 0.2% Yield Strength, ksi Elongation in 2", %
170 160 10