Ti-6Al-2Sn-4Zr-2Mo
Near-alpha high-temperature titanium alloy. Better creep resistance than Ti-6Al-4V at temperatures above 400°C — usable to 550°C continuous. Sn and Zr are alpha-stabilizers providing solid-solution strengthening without eutectoid decomposition. THE jet engine compressor disc alloy (stages 2-7 typically). Also used for afterburner structures, blisks, and gas turbine components. Si addition (0.06-0.10%) further improves creep.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | ASTM | USA | UNS R54620 | R54620 | REF |
| 🇺🇸 | AMS | USA | AMS 4976 (bar/forging) | — | 100% |
Sources: ASTM B381, AMS 4976
Chemical composition comparison (wt%)
Side-by-side: Ti-6Al-2Sn-4Zr-2Mo (ASTM) (ASTM B381) vs AMS 4976 (bar/forging) (AMS)
| Element | Ti-6Al-2Sn-4Zr-2Mo (ASTM) | AMS 4976 (bar/forging) (AMS) | Overlap |
|---|---|---|---|
| Si | 0.06–0.1% | — | — |
| Mo | 1.8–2.2% | — | — |
| Al | 5.5–6.5% | — | — |
| Ti | — | — | — |
| Sn | 1.75–2.25% | — | — |
| Zr | 3.5–4.5% | — | — |
| Fe | 0–0.25% | — | — |
| O | 0–0.15% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 900–1000 | MPa |
| Yield Strength | 830–900 | MPa |
| Elongation | 10–15 | % |
| Elastic Modulus | ≥ 114 | GPa |
| Density | ≥ 4.54 | g/cm3 |
Compatibility verdict
Ti-6Al-2Sn-4Zr-2Mo and AMS 4976 (bar/forging): 100% composition match
Close equivalents but NOT identical.
Related materials
Titanium Grade 1
3.7025The softest and most ductile commercially pure titanium grade. Lowest O content (0.18% max) for maximum formability. Used for plate heat exchangers, chemical plant vessels, explosive cladding, deep-drawn parts, and anodizing applications. Lower strength than Grade 2 but superior formability.
Titanium Grade 4
3.7065The strongest commercially pure titanium grade. Highest oxygen content (0.40% max) for maximum strength among CP grades. UTS min 550 MPa — approaches some Ti alloys. Used for airframe skins, marine hardware, surgical implants, and chemical plant components requiring higher strength than Grade 2.
Ti Grade 9 / Ti-3Al-2.5V
3.7195Medium-strength alpha-beta titanium alloy — the standard for seamless tubing. 50% stronger than CP Grade 2 with better cold formability than Ti-6Al-4V. The go-to alloy for hydraulic tubing in aerospace and bicycle frames. Used for aircraft hydraulic lines, offshore risers, and sporting goods.
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