Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) vs Ti-6Al-7Nb: 68% composition overlap. Moderate differences, generally not direct substitutes.
Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) vs Ti-6Al-7Nb
Side-by-side chemical composition and mechanical property comparison.
Overview
Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S)
3.7145
Near-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.
Ti-6Al-7Nb
Alpha-beta titanium alloy with Nb replacing V — developed specifically to eliminate vanadium cytotoxicity concerns. Similar mechanical properties to Ti-6Al-4V but with superior biocompatibility and corrosion resistance in body fluids. ISO 5832-11 / ASTM F1295 for surgical implants. Trade name: IMI 367 (originally). Used for hip prostheses, knee replacements, fracture fixation plates, spinal devices, screws, and dental implants.
| Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) | Ti-6Al-7Nb | |
|---|---|---|
| Material Number | 3.7145 | — |
| Category | Titanium | Titanium |
| Standard | AMS 4919 / AMS 4975 | ISO 5832-11 |
Chemical composition (wt%)
| Element | Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) | Ti-6Al-7Nb | Overlap |
|---|---|---|---|
| C | ≤ 0.05% | 0–0.08% | OK |
| Si | 0.06–0.1% | — | — |
| Mo | 1.8–2.2% | — | — |
| Al | 5.5–6.5% | 5.5–6.5% | OK |
Mechanical properties
| Property | Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) | Ti-6Al-7Nb | Unit |
|---|---|---|---|
| tensile_strength | 940–1110 | 900–1050 | MPa |
| yield_strength | 860–1050 | 800–950 | MPa |
| elongation | 13–15 | 8–15 | % |
Compatibility Assessment
Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) and Ti-6Al-7Nb have moderate differences (68% overlap). They are generally not direct substitutes. Consider the specific requirements of your application.
Automated assessment based on composition analysis
Frequently Asked Questions
Is Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) the same as Ti-6Al-7Nb?
Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) and Ti-6Al-7Nb have a 68% composition overlap. They are generally not directly interchangeable.
Can I replace Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) with Ti-6Al-7Nb?
Generally not recommended. The compositions differ significantly (68% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) and Ti-6Al-7Nb?
The main differences are in the following elements: overall alloying content. Ti-6Al-2Sn-4Zr-2Mo-Si (Ti-6242S) is a Titanium grade, while Ti-6Al-7Nb is a Titanium grade.
View full data for each material:
Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.