Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S)
3.7145Near-alpha high-temperature titanium alloy with silicon addition for creep resistance. UNS R54620. Rm 940–1110 MPa, Rp0.2 860–1050 MPa, A 13–15%. Density 4.54 g/cm³, E-Modul 114–118 GPa. Excellent creep strength and thermal stability to 540°C. AMS 4919/4975/4976. Applications: gas turbine compressor blades and discs, impellers, afterburner structures, hot airframe skin. Boeing 787, GE/P&W engines.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | R54620 | — | % |
| 🇩🇪 | DIN | Germany | TiAl6Sn2Zr4Mo2Si | 3.7145 | % |
| 🇺🇸 | AMS | USA | AMS 4919/4975/4976 | — | % |
| 🇺🇸 | ATI | USA | ATI 6-2-4-2 | — | % |
Sources: SAE/ASTM, DIN, SAE AMS, atimaterials.com
Mechanical properties
Compatibility verdict
Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) and R54620: null% composition match
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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