Ti-6246 Titanium
A high-strength α+β titanium alloy
Typical values for the temper in the title
Ti-6246 is an α+β alloy with more molybdenum (about 6%) than Ti-6242. Molybdenum increases hardenability, so in thick sections it reaches much higher strength than Ti-6Al-4V: about 1100–1170 MPa in the solution treated and aged (STA) condition.
It keeps strength at moderate temperatures (up to about 400–450 °C), and is used for disks and compressor parts in jet engines, and high-strength structural parts in thick sections.
Mechanical and physical properties
| Property | Value | Note |
|---|---|---|
| Tensile strength Rm | ≈1100–1170 MPa (STA) | |
| Yield strength Rp0.2 | ≈1030–1100 MPa (STA) | |
| Elongation A | 6–10% | |
| Modulus of elasticity E | ≈114 GPa | |
| Density ρ | 4.65 g/cm³ | |
| Machinability | 20% | relative rating in the site database |
Chemical composition (wt %)
| Element | Range | Role |
|---|---|---|
| Al aluminum | 5.50–6.50 | alpha stabilizer |
| Sn tin | 1.75–2.25 | strength |
| Zr zirconium | 3.5–4.5 | strength |
| Mo molybdenum | about 6 | hardenability, beta stabilizer |
| O oxygen | max 0.15 |
Composition and properties per AMS 4981 (titanium.com).
Conditions and heat treatment
Ti-6246 is usually supplied solution treated and aged (STA).
| Condition | Properties | When to choose it |
|---|---|---|
| Solution treated and aged (STA) | Rm about 1100–1170, Rp about 1030–1100 MPa | disks and structural parts |
Applications
- Jet engine disks
- Compressor parts
- High-strength structural parts
- Thick forgings
- Parts at moderate heat
Fabrication
Machining
Harder than Ti-6Al-4V because of the high strength. Low speed and sharp tools.
Welding
Limited. Parts are usually forged and machined.
Thick sections
Its main advantage over Ti-6Al-4V is high strength even at the center of a thick section.
Compared with similar materials
| Material | Rm / Rp0.2 | Welding | When it is the better choice |
|---|---|---|---|
| Ti-6242 | 1000 / 900 MPa | Good | Ti-6242: for higher heat, weaker · material page |
| Ti-6Al-4V (Grade 5) | 950–1100 / 880 MPa | Good — ERTi-5 | Ti-6Al-4V: the common alloy, weaker in thick sections · material page |
| Ti-5553 | 1200 / 1100 MPa | Medium | Ti-5553: a very strong near-beta alloy · material page |
Common mistakes
Confusing it with Ti-6242
6242 is meant for heat (creep), 6246 for strength.
Machining with Ti-6Al-4V parameters
It is stronger and wears tools faster.
Expecting strength without STA
Full strength comes from the heat treatment.
Equivalents, standards and supply
| Standards | AMS 4981 |
|---|---|
| Forms | bar · plate · tube |
| Producers | TIMET · ATI |
Learn more
Values are typical and for comparison only. For design, rely on the standard and the mill certificate. Sources: ASTM B265 (sheet and plate), ASTM F136, AMS specifications, producer data sheets, and the METAL HUB materials database.
Updated: October 31, 2026