Refractory Metal Cb-752 vs R04251
Refractory Metal · grade comparison
Refractory Metal Cb-752 and R04251 are both refractory metal grades. Cb-752 is the stronger of the two: yield strength 310 MPa (45 ksi) against 140 MPa (20.3 ksi) for R04251, about 121% more; tensile strength follows at 450 MPa (65.3 ksi) vs 250 MPa (36.3 ksi). In exchange, R04251 is the more ductile: elongation 30% versus 25% for Cb-752, and Cb-752 is harder (180 HV vs 100 HV). R04251 is lighter (8.6 g/cm³ vs 9.03 g/cm³ for Cb-752) and Cb-752 is stiffer (110 GPa vs 100 GPa). On the shop floor, R04251 welds better (80 vs 70 out of 100).
Cb-752Choose 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.
Cb-752 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
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
Same in both: Bulk Modulus 170 GPa24.7 Msi · Poisson's Ratio 0.38
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)
Min Service Temperature
Same in both: Specific Heat Capacity 270 J/kg·K0.06 BTU/lb·°F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Galvanic Potential (seawater, vs SCE)
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Polishability
Castability
Same in both: Machinability Rating (AISI 1212 = 100 %) 25% · Brazeability / Solderability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Embodied Water
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 | Cb-752 | R04251 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Cb-752 vs R04251 — frequently asked
Is Cb-752 stronger than R04251?
Yes. Cb-752 has a typical yield strength of 310 MPa (45 ksi) against 140 MPa (20.3 ksi) for R04251 — about 121% more. Tensile strength is 450 MPa (65.3 ksi) vs 250 MPa (36.3 ksi).
Which is cheaper, Cb-752 or R04251?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which welds better, Cb-752 or R04251?
R04251. Its weldability rates very good (80/100) against very good (70/100) for Cb-752.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Cb-752 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.