Titanium Grade 27 vs Ti-6Al-2Sn-4Zr-2Mo-0.1Si
Titanium · grade comparison
Titanium Grade 27 and Ti-6Al-2Sn-4Zr-2Mo-0.1Si are both titanium grades. Ti-6Al-2Sn-4Zr-2Mo-0.1Si is the stronger of the two: yield strength 930 MPa (135 ksi) against 230 MPa (33.4 ksi) for Grade 27, about 4.0 times as much; tensile strength follows at 1,010 MPa (146 ksi) vs 330 MPa (47.9 ksi). In exchange, Grade 27 is the more ductile: elongation 32% versus 15% for Ti-6Al-2Sn-4Zr-2Mo-0.1Si, and Ti-6Al-2Sn-4Zr-2Mo-0.1Si is harder (320 HB vs 120 HB). Ti-6Al-2Sn-4Zr-2Mo-0.1Si is stiffer (114 GPa vs 103 GPa) and Ti-6Al-2Sn-4Zr-2Mo-0.1Si runs hotter in service (510°C vs 315°C continuous). On the shop floor, Grade 27 machines more easily (fair vs poor) and Grade 27 welds better (excellent vs good).
Grade 27Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
Ti-6Al-2Sn-4Zr-2Mo-0.1SiChoose it when strength drives the design, or when the part sees heat.
Grade 27 vs Ti-6Al-2Sn-4Zr-2Mo-0.1Si: 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.
Grade 27Ti-6Al-2Sn-4Zr-2Mo-0.1Si
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)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Hardness, Rockwell C
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Latent Heat of Fusion 365 J/g157 BTU/lb
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Brazeability / Solderability
Same in both: Castability 30 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Same in both: Embodied Energy (primary production) 680 MJ/kg292,348 BTU/lb · Typical Recycled Content 25%
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 | Grade 27 | Ti-6Al-2Sn-4Zr-2Mo-0.1Si |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 1 finish: Plasma Spray.
Grade 27 vs Ti-6Al-2Sn-4Zr-2Mo-0.1Si — frequently asked
Is Ti-6Al-2Sn-4Zr-2Mo-0.1Si stronger than Grade 27?
Yes. Ti-6Al-2Sn-4Zr-2Mo-0.1Si has a typical yield strength of 930 MPa (135 ksi) against 230 MPa (33.4 ksi) for Grade 27 — about 4.0 times as much. Tensile strength is 1,010 MPa (146 ksi) vs 330 MPa (47.9 ksi).
Which is cheaper, Grade 27 or Ti-6Al-2Sn-4Zr-2Mo-0.1Si?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, Grade 27 or Ti-6Al-2Sn-4Zr-2Mo-0.1Si?
Grade 27. Its machinability rates fair (40/100) against poor (18/100) for Ti-6Al-2Sn-4Zr-2Mo-0.1Si; for welding the order is Grade 27 first (excellent, 92/100) then Ti-6Al-2Sn-4Zr-2Mo-0.1Si (good, 65/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Grade 27 and Ti-6Al-2Sn-4Zr-2Mo-0.1Si 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.