Steel WC4 vs ZG55SiMnMo
Steel · grade comparison
Steel WC4 and ZG55SiMnMo are both steel grades. ZG55SiMnMo is the stronger of the two: yield strength 1,300 MPa (189 ksi) against 335 MPa (48.6 ksi) for WC4, about 3.9 times as much; tensile strength follows at 1,600 MPa (232 ksi) vs 545 MPa (79 ksi). In exchange, WC4 is the more ductile: elongation 24% versus 5% for ZG55SiMnMo, and ZG55SiMnMo is harder (460 HB vs 163 HB). WC4 runs hotter in service (540°C vs 350°C continuous) and WC4 conducts electricity better (7.8 % IACS vs 6.2 % IACS). On the shop floor, WC4 machines more easily (good vs poor) and WC4 welds better (good vs poor).
WC4Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
ZG55SiMnMoChoose it when strength drives the design.
WC4 vs ZG55SiMnMo: 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
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, Rockwell C
Hardness, Vickers
Same in both: Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
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 470 J/kg·K0.11 BTU/lb·°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)
Castability
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Water
Typical Recycled Content
Same in both: Embodied Energy (primary production) 26 MJ/kg11,178 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg
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 steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | WC4 | ZG55SiMnMo |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $$ 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.
WC4 vs ZG55SiMnMo — frequently asked
Is ZG55SiMnMo stronger than WC4?
Yes. ZG55SiMnMo has a typical yield strength of 1,300 MPa (189 ksi) against 335 MPa (48.6 ksi) for WC4 — about 3.9 times as much. Tensile strength is 1,600 MPa (232 ksi) vs 545 MPa (79 ksi).
Which is cheaper, WC4 or ZG55SiMnMo?
Both sit in the same relative cost tier ($$, standard); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, WC4 or ZG55SiMnMo?
WC4. Its machinability rates good (58/100) against poor (15/100) for ZG55SiMnMo; for welding the order is WC4 first (good, 55/100) then ZG55SiMnMo (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in WC4 and ZG55SiMnMo 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.