Titanium Ti-15Mo-2.7Nb-3Al-0.2Si vs Ti-3Al-8V-6Cr-4Mo-4Zr
Titanium · grade comparison
Titanium Ti-15Mo-2.7Nb-3Al-0.2Si and Ti-3Al-8V-6Cr-4Mo-4Zr are both titanium grades. Ti-3Al-8V-6Cr-4Mo-4Zr is the stronger of the two: tensile strength 900 MPa (131 ksi) against 840 MPa (122 ksi) for Ti-15Mo-2.7Nb-3Al-0.2Si, about 7% more. Ti-3Al-8V-6Cr-4Mo-4Zr is harder — 32 HRC against 28 HRC for Ti-15Mo-2.7Nb-3Al-0.2Si — which matters for wear surfaces and threads. Ti-3Al-8V-6Cr-4Mo-4Zr is stiffer (86 GPa vs 80 GPa) and Ti-15Mo-2.7Nb-3Al-0.2Si runs hotter in service (480°C vs 200°C continuous). On the shop floor, Ti-15Mo-2.7Nb-3Al-0.2Si forms better (very good vs good).
Ti-15Mo-2.7Nb-3Al-0.2SiChoose it when the part sees heat.
Ti-3Al-8V-6Cr-4Mo-4ZrChoose it when strength drives the design, or when surface hardness matters.
Ti-15Mo-2.7Nb-3Al-0.2Si vs Ti-3Al-8V-6Cr-4Mo-4Zr: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all titanium grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all titanium grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Ti-15Mo-2.7Nb-3Al-0.2SiTi-3Al-8V-6Cr-4Mo-4Zr
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Reduction in Area
Compressive Strength
Shear Strength
Fracture Toughness (K_IC)
Hardness, Rockwell C
Hardness, Vickers
Charpy V-Notch Impact (RT)
Same in both: Elongation at Break 18% · Fatigue Strength (Endurance Limit) 450 MPa65.3 ksi
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Thermal Conductivity 7.6 W/m·K4.4 BTU/hr·ft·°F · Specific Heat Capacity 500 J/kg·K0.12 BTU/lb·°F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V · Corrosion Resistance 92 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Castability
Brazeability / Solderability
Same in both: Machinability Rating (AISI 1212 = 100 %) 15% · Weldability 60 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 700 MJ/kg300,946 BTU/lb
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every titanium grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | Ti-15Mo-2.7Nb-3Al-0.2Si | Ti-3Al-8V-6Cr-4Mo-4Zr |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 1 finish: Plasma Spray.
Ti-15Mo-2.7Nb-3Al-0.2Si vs Ti-3Al-8V-6Cr-4Mo-4Zr — frequently asked
Is Ti-3Al-8V-6Cr-4Mo-4Zr stronger than Ti-15Mo-2.7Nb-3Al-0.2Si?
Yes. Ti-3Al-8V-6Cr-4Mo-4Zr has a typical tensile strength of 900 MPa (131 ksi) against 840 MPa (122 ksi) for Ti-15Mo-2.7Nb-3Al-0.2Si — about 7% more.
Which is cheaper, Ti-15Mo-2.7Nb-3Al-0.2Si or Ti-3Al-8V-6Cr-4Mo-4Zr?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
When should I choose Ti-15Mo-2.7Nb-3Al-0.2Si over Ti-3Al-8V-6Cr-4Mo-4Zr?
Pick Ti-15Mo-2.7Nb-3Al-0.2Si when the part sees heat. Pick Ti-3Al-8V-6Cr-4Mo-4Zr when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Ti-15Mo-2.7Nb-3Al-0.2Si and Ti-3Al-8V-6Cr-4Mo-4Zr side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.