Titanium Grade 13 vs OT4-1
Titanium · grade comparison
Titanium Grade 13 and OT4-1 are both titanium grades. OT4-1 is the stronger of the two: yield strength 510 MPa (74 ksi) against 240 MPa (34.8 ksi) for Grade 13, about 113% more; tensile strength follows at 640 MPa (92.8 ksi) vs 345 MPa (50 ksi). In exchange, Grade 13 is the more ductile: elongation 28% versus 24% for OT4-1, and OT4-1 is harder (200 HB vs 130 HB). OT4-1 runs hotter in service (330°C vs 300°C continuous) and Grade 13 conducts heat better (17.5 W/m·K vs 11 W/m·K).
Grade 13Choose it when the part is bent, formed or impact-loaded.
OT4-1Choose it when strength drives the design, or when the part sees heat.
Grade 13 vs OT4-1: 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
Same in both: Reduction in Area 45%
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 %)
Formability (cold)
Brazeability / Solderability
Same in both: Weldability 88 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Water
Same in both: Embodied Carbon (primary production) 45 kg CO₂/kg · 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 13 | OT4-1 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 1 finish: Plasma Spray.
Grade 13 vs OT4-1 — frequently asked
Is OT4-1 stronger than Grade 13?
Yes. OT4-1 has a typical yield strength of 510 MPa (74 ksi) against 240 MPa (34.8 ksi) for Grade 13 — about 113% more. Tensile strength is 640 MPa (92.8 ksi) vs 345 MPa (50 ksi).
Which is cheaper, Grade 13 or OT4-1?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, Grade 13 or OT4-1?
Grade 13. Its machinability rates fair (38/100) against poor (32/100) for OT4-1.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Grade 13 and OT4-1 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.