Ti-6Al-2Sn-4Zr-6Mo
Beta-rich alpha-beta titanium alloy — higher Mo (6%) than Ti-6242 for significantly higher strength (UTS 1100+ STA). Forged beta then STA (Solution Treat + Age) for peak properties. Used for high-compressor discs and blades in jet engines where strength at 300-450°C is critical. More Beta phase than 6242 = higher strength but lower creep resistance. AMS 4981.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AMS | USA | AMS 4981 / UNS R56260 | R56260 | REF |
Sources: AMS 4981
Chemical composition comparison (wt%)
Side-by-side: Ti-6Al-2Sn-4Zr-6Mo (AMS) (AMS 4981) vs ASTM
| Element | Ti-6Al-2Sn-4Zr-6Mo (AMS) | ASTM | Overlap |
|---|---|---|---|
| Mo | 5.5–6.5% | — | — |
| Al | 5.5–6.5% | — | — |
| Ti | — | — | — |
| Sn | 1.75–2.25% | — | — |
| Zr | 3.5–4.5% | — | — |
| Fe | 0–0.15% | — | — |
| O | 0–0.15% | — | — |
Mechanical properties
STA
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 1100–1250 | MPa |
| Yield Strength | 1000–1150 | MPa |
| Elongation | 8–12 | % |
| Elastic Modulus | ≥ 114 | GPa |
| Density | ≥ 4.54 | g/cm3 |
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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