Refractory Metal C-129Y vs R04251
Refractory Metal · grade comparison
Refractory Metal C-129Y and R04251 are both refractory metal grades. C-129Y is the stronger of the two: yield strength 480 MPa (69.6 ksi) against 140 MPa (20.3 ksi) for R04251, about 3.4 times as much; tensile strength follows at 585 MPa (84.8 ksi) vs 250 MPa (36.3 ksi). In exchange, R04251 is the more ductile: elongation 30% versus 22% for C-129Y, and C-129Y is harder (220 HV vs 100 HV). R04251 is lighter (8.6 g/cm³ vs 9.46 g/cm³ for C-129Y) and C-129Y is stiffer (131 GPa vs 100 GPa). On the shop floor, R04251 welds better (80 vs 70 out of 100).
C-129YChoose it when strength drives the design, or when the part sees heat.
R04251Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
C-129Y vs R04251: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all refractory metal 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 refractory metal 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
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, Rockwell C
Hardness, Vickers
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
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 270 J/kg·K0.06 BTU/lb·°F · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
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
Polishability
Castability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
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 refractory metal grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | C-129Y | R04251 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
C-129Y vs R04251 — frequently asked
Is C-129Y stronger than R04251?
Yes. C-129Y has a typical yield strength of 480 MPa (69.6 ksi) against 140 MPa (20.3 ksi) for R04251 — about 3.4 times as much. Tensile strength is 585 MPa (84.8 ksi) vs 250 MPa (36.3 ksi).
Which is cheaper, C-129Y or R04251?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, C-129Y or R04251?
R04251. Its weldability rates very good (80/100) against very good (70/100) for C-129Y.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C-129Y and R04251 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.