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AMS 4907
AMS 4907 — Ti-6Al-4V ELI Titanium Sheet & Strip (Annealed)
AMS 4907 covers Ti-6Al-4V ELI (Extra Low Interstitial) in sheet and strip (often supplied as plate, too). It’s engineered for high strength-to-weight, consistently low interstitial content for fracture toughness, and excellent corrosion resistance—a strong fit for marine, naval and offshore hardware where seawater, chlorides, and fatigue demand better performance.
What AMS 4907 Specifies (Overview)
Alloy family: Ti-6Al-4V ELI (α-β titanium alloy)
Product forms: Sheet, Strip (plate available from many mills/service centers)
Condition: Annealed to deliver toughness and reliable forming/welding
Use cases: Submarine structures, ROV frames, seawater-exposed panels, valves, fasteners, hull inserts, and naval vessel components needing light weight + long life
ams4907 specifications — Chemistry & Mechanical
Final acceptance values are per purchase order and the latest revision of the spec. The figures below reflect commonly published ranges for AMS 4907 (Ti-6Al-4V ELI).
Chemistry (wt%)
| Element | Typical Range / Max |
|---|---|
| Aluminum (Al) | 5.5–6.5% |
| Vanadium (V) | 3.5–4.5% |
| Oxygen (O) | ≤ 0.13% (ELI control) |
| Iron (Fe) | ≤ 0.25% |
| Carbon (C) | ≤ 0.08% |
| Nitrogen (N) | ≤ 0.05% |
| Hydrogen (H) | ≤ 0.0125% |
| Yttrium (Y) | ≤ 0.005% |
| Others (total) | ≤ 0.40% |
| Titanium (Ti) | Balance |
Mechanical (Annealed, thickness-dependent)
| Property | Typical Range |
|---|---|
| 0.2% Yield Strength | ~115–120 ksi |
| Ultimate Tensile Strength | ~125–130 ksi |
| Elongation | ~6–10% |
Notes: ELI cleanliness supports fracture toughness and fatigue in cyclic, chloride-rich service.
Why Marine Teams Choose AMS 4907
Seawater & Chloride Resistance
A tenacious oxide film gives excellent corrosion resistance in natural seawater, splash zones, and brine environments.
Toughness from ELI
The ELI limit on interstitials (especially O and H) enhances toughness and damage tolerance—valuable for pressure-bearing parts and welded fabrications.
Weldability & Fabrication
Well-proven with GTAW/GMAW (inert shielding required). Good formability in the annealed condition for panels, trays, flanges, and stiffeners.
Typical Applications (Marine & Beyond)
Subsea/ROV: frames, housings, pressure covers
Naval vessels & subs: structural inserts, fairings, corrosion-critical panels
Valves & pumps: seawater-contact components, fasteners, stems
Offshore: splash-zone plates, riser accessories, clamps
Also used in: aerospace skins/brackets, motorsport, medical hardware
Comparing AMS 4907 vs AMS 4911 (Quick Guide)
| Spec | Material / Form | Best Used When |
|---|---|---|
| AMS 4907 | Ti-6Al-4V ELI — Sheet/Strip (Annealed) | Toughness, fatigue, and welded marine fabrications |
| AMS 4911 | Ti-6Al-4V (Gr 5) — Sheet/Strip/Plate (Annealed) | General aerospace & industrial where ELI not required |
If your drawing cites ELI, AMS 4907 is the correct route.
Sourcing & Compliance — India Supply Focus
Important: AMS 4907 is not a beta titanium alloy; it’s α-β Ti-6Al-4V ELI. If your project requires beta titanium (e.g., Ti-15V-3Cr-3Sn-3Al, Ti-13V-11Cr-3Al, or Beta-C), ask for those by their specific AMS numbers.
Pan-India supply of AMS 4907 sheet/strip (and plate from service stock)
Cut-to-size, leveling, deburring, export-grade packaging
Documentation: full MTRs, heat/lot traceability, optional UT, hardness, microstructure
Compliance: DFARS/ROHS/REACH and naval clauses available on request
Fabrication Notes (Marine-Ready Builds)
Welding: Strict argon shielding (front & back purge), immaculate prep to avoid alpha-case and hydrogen pickup.
Forming: Annealed stock forms well with generous radii and proper lubrication.
Machining: Sharp tooling, moderate speeds, high coolant flow to manage heat/work hardening.
Cleaning: Prefer non-chlorinated cleaners; preserve/passivate the oxide film post-fabrication.
ELI cleanliness and seawater resistance for demanding offshore and naval projects.
MTRs with chemistry/mechanicals; optional UT, hardness, and micro per PO.
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Aerospace-grade AMS 4907 supply with MTRs, processing, and export-ready.