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HY Titanium 6-4 STA Material grades and equivalents

6-4 STA Titanium, 6-4 STA, Ti 6-4 STA, UNS R56400

Introduction

HY Titanium 6-4 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.

HY Titanium 6-4 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 Composition

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

Mechanical Properties

Specified, STA sheet & plate