Titanium Grade 4 vs Grade 6
Titanium · grade comparison
Titanium Grade 4 and Grade 6 are both titanium grades. Grade 6 is the stronger of the two: yield strength 810 MPa (117 ksi) against 550 MPa (79.8 ksi) for Grade 4, about 47% more; tensile strength follows at 860 MPa (125 ksi) vs 620 MPa (89.9 ksi). In exchange, Grade 4 is the more ductile: elongation 20% versus 16% for Grade 6, and Grade 6 is harder (310 HB vs 253 HB). Grade 6 runs hotter in service (450°C vs 300°C continuous) and Grade 4 conducts heat better (17.2 W/m·K vs 7.8 W/m·K).
Grade 4Choose it when the part is bent, formed or impact-loaded.
Grade 6Choose it when strength drives the design, or when the part sees heat.
Grade 4 vs Grade 6: 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.
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
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
Same in both: Reduction in Area 40%
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)
Latent Heat of Fusion
Max Service Temperature (continuous)
Same in both: Min Service Temperature -196°C-321 °F
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)
Castability
Brazeability / Solderability
Same in both: Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: 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 4 | Grade 6 |
|---|---|---|
| Default condition | O | O |
| Relative cost | $$$$$ Specialty | $$$$$ Specialty |
| Min. machined wall | 1 mm | 1 mm |
| Best machined surface | Ra 1.6 µm | Ra 1.6 µm |
Both are offered for CNC machining and Sheet metal. Both take the same 20 finishes: AlCrN, AlTiN, Anodizing Type II, CVD Al2O3, CVD TiCN, CVD TiN, Cerakote, CrN, DLC, Electropolishing, HVOF Coating, MoS2 and 8 more.
Grade 4 vs Grade 6 — frequently asked
Is Grade 6 stronger than Grade 4?
Yes. Grade 6 has a typical yield strength of 810 MPa (117 ksi) against 550 MPa (79.8 ksi) for Grade 4 — about 47% more. Tensile strength is 860 MPa (125 ksi) vs 620 MPa (89.9 ksi).
Which is cheaper, Grade 4 or Grade 6?
Both sit in the same relative cost tier ($$$$$, specialty); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, Grade 4 or Grade 6?
Grade 4, by a small margin. Both rate poor for machinability — 30/100 against 22/100 for Grade 6; for welding the order is Grade 4 first (very good, 80/100) then Grade 6 (very good, 75/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Grade 4 and Grade 6 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.