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AMS 6931
AMS 6931 – Ti-6Al-4V Titanium Bars, Forgings & Forging Stock (Annealed)
Overview
AMS 6931 covers Ti-6Al-4V (Grade 5) titanium supplied in the annealed condition as bars, forgings, and forging stock. It is selected when engineers need the workability and machinability of annealed Ti-6Al-4V—while still meeting certified chemistry, microstructure, and mechanical requirements for aerospace and high-performance hardware. If you’re sourcing an AMS titanium alloy bar, AMS 6931 is a common call-out on aerospace prints.
Why Engineers Choose AMS 6931
Balanced performance → high strength-to-weight with better formability than STA material
Reliable processing window → annealed condition supports machining, forming, and later heat treatment
Corrosion resistance & biocompatibility → suitable for marine and medical-adjacent hardware (per PO)
Traceable quality → tight control of chemistry, microstructure, and surface condition
Product Forms & Size Guidance
Round, hex, and square bars for shafts, fasteners, and structural members
Closed/open-die forgings and forging stock for near-net shapes
Exact dimensional limits, tolerances, and testing per purchase order.
Chemical Composition (Nominal Limits – Ti-6Al-4V)
| Element | Nominal Limit |
|---|---|
| Aluminum (Al) | 5.5–6.75% |
| Vanadium (V) | 3.5–4.5% |
| Iron (Fe) | ≤ 0.30% |
| Oxygen (O) | ≤ 0.20% |
| Carbon (C) | ≤ 0.08% |
| Nitrogen (N) | ≤ 0.05% |
| Hydrogen (H) | Typically ≤ 0.0125% |
| Yttrium (Y) | ≤ 0.005% |
| Titanium (Ti) | Balance |
Final limits per purchase order/specification.
Mechanical Performance (Annealed)
Ultimate Tensile Strength: ~130 ksi (typical)
0.2% Yield Strength: ~120 ksi (typical)
Elongation: ~8–10%
Reduction of Area: ~15–25%
Properties vary with section size/orientation—use MTRs for design.
Applications
Aerospace: fittings, actuators, lugs, linkages, rotor/ring preforms for later heat treat
High-performance industrial hardware—lightweight, high-strength parts
Medical & Marine: corrosion-resistant components when Ti-6Al-4V is specified
If your print calls for an AMS titanium alloy bar with good machinability before final heat treatment, AMS 6931 fits.
AMS 6931 vs Related Titanium Specs
| Spec | Alloy / Condition | Best Used When |
|---|---|---|
| AMS 6931 | Ti-6Al-4V, annealed; bars, forgings, forging stock | Machining/forming first with the option to heat treat later |
| AMS 6930 | Ti-6Al-4V, STA | As-supplied high strength in finished part |
| AMS 4928 | Ti-6Al-4V, annealed; bars, wire, forgings, rings | Broad annealed route (wire & rings included) |
Rule of thumb: AMS 6931 for machine/form → optional heat treat; AMS 6930 for STA strength as delivered.
Quality & Acceptance (As Called Out on PO)
Chemical composition and microstructure verification
Tensile testing by orientation/section
Macrostructure and surface contamination controls for titanium
Ultrasonic / NDT when specified
Fabrication Notes
Machining: sharp tooling, generous coolant, controlled feeds to manage heat/work hardening (similar to austenitic stainless)
Forming / Forging: alpha-beta alloy practices; maintain cleanliness and avoid oxygen pickup
Welding: TIG/EB with inert shielding and strict cleanliness; procedure qualification recommended
Titanium Metals specializes in high-quality titanium materials and components for critical industries. Every product is manufactured with precision, tested for strength, corrosion resistance, and purity.
We deliver premium-grade titanium metals engineered for high performance and long-term reliability. Every product is manufactured with strict quality controls, precise dimensions, and flawless finishing to match international standards.
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