Steel A757 Grade C3 vs WC4
Steel · grade comparison
Steel A757 Grade C3 and WC4 are both steel grades. A757 Grade C3 is the stronger of the two: yield strength 460 MPa (66.7 ksi) against 335 MPa (48.6 ksi) for WC4, about 37% more; tensile strength follows at 620 MPa (89.9 ksi) vs 545 MPa (79 ksi). A757 Grade C3 is harder — 190 HB against 163 HB for WC4 — which matters for wear surfaces and threads. WC4 runs hotter in service (540°C vs 400°C continuous) and WC4 conducts heat better (42 W/m·K vs 36 W/m·K). On the shop floor, WC4 forms better (poor vs not recommended) and WC4 sits in a lower cost tier (standard, $$) than A757 Grade C3 (premium, $$$).
A757 Grade C3Choose it when strength drives the design, or when surface hardness matters.
WC4Choose it when the part sees heat, or when cost is the deciding factor.
A757 Grade C3 vs WC4: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all steel 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 steel 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
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
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
Same in both: Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Elongation at Break 24%
Physical
Density and transition temperatures.
Density
Same in both: Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,500°C2,732 °F
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 270 J/g116 BTU/lb
Electrical
Conductivity and insulation.
Electrical Resistivity
Electrical Conductivity
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)
Castability
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 55 L/kg6.6 gal/lb
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Same in both: Thermal Shock Resistance Index 9
Strength versus weight
Yield strength against density for every steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | A757 Grade C3 | WC4 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 9 finishes: Copper Plating, Electroless Nickel (EN), Epoxy Coating, Gold Plating, Hard Chrome Plating, Manganese Phosphate, Plasma Spray, Silver Plating, Zinc Phosphate.
A757 Grade C3 vs WC4 — frequently asked
Is A757 Grade C3 stronger than WC4?
Yes. A757 Grade C3 has a typical yield strength of 460 MPa (66.7 ksi) against 335 MPa (48.6 ksi) for WC4 — about 37% more. Tensile strength is 620 MPa (89.9 ksi) vs 545 MPa (79 ksi).
Which is cheaper, A757 Grade C3 or WC4?
WC4 is the lower-cost material: it sits in the standard tier ($$) while A757 Grade C3 is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which welds better, A757 Grade C3 or WC4?
A757 Grade C3. Its weldability rates good (60/100) against good (55/100) for WC4.
Ready to make it?
Upload a CAD file and FabDigit prices the part in A757 Grade C3 and WC4 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.