Steel 42CrMo4 vs X82WMoCrV6-5-4
Steel · grade comparison
Steel 42CrMo4 and X82WMoCrV6-5-4 are both steel grades. Both yield at about 550 MPa — strength does not separate them. 42CrMo4 is the more ductile: elongation 14% versus 12% for X82WMoCrV6-5-4. 42CrMo4 is lighter (7.85 g/cm³ vs 8.16 g/cm³ for X82WMoCrV6-5-4) and 42CrMo4 runs hotter in service (400°C vs 300°C continuous). On the shop floor, 42CrMo4 machines more easily (50 vs 35 out of 100), 42CrMo4 welds better (fair vs poor), and 42CrMo4 sits in a lower cost tier (standard, $$) than X82WMoCrV6-5-4 (premium, $$$).
42CrMo4Choose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
42CrMo4 vs X82WMoCrV6-5-4: 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
Bulk Modulus
Tensile Strength (Ultimate)
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 C
Hardness, Vickers
Hardness, Rockwell B
Same in both: Poisson's Ratio 0.29 · Yield Strength (0.2% offset) 550 MPa79.8 ksi
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 250 J/g107 BTU/lb
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
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 Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Same in both: Specific Strength (UTS / density) 108 kN·m/kg
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 | 42CrMo4 | X82WMoCrV6-5-4 |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| Default condition | HR | — |
| Relative cost | $$ Standard | $$$ Premium |
| Min. machined wall | 0.8 mm | — |
| Best machined surface | Ra 1.6 µm | — |
| AlCrN | Yes | — |
| AlTiN | Yes | — |
| Black Oxide | Yes | — |
| CVD Al2O3 | Yes | — |
| CVD TiCN | Yes | — |
| CVD TiN | Yes | — |
| Cerakote | Yes | — |
| Chrome Plating | Yes | — |
| CrN | Yes | — |
| DLC | Yes | — |
| E-Coating | Yes | — |
| HVOF Coating | Yes | — |
| Hot-Dip Galvanizing | Yes | — |
| MoS2 | Yes | — |
| Multilayer CVD | Yes | — |
| Nickel Plating | Yes | — |
| PTFE Coating | Yes | — |
| Painting | Yes | — |
They share 9 finishes: Copper Plating, Electroless Nickel (EN), Epoxy Coating, Gold Plating, Hard Chrome Plating, Manganese Phosphate, Plasma Spray, Silver Plating, Zinc Phosphate.
42CrMo4 vs X82WMoCrV6-5-4 — frequently asked
What is the difference between 42CrMo4 and X82WMoCrV6-5-4?
Steel 42CrMo4 and X82WMoCrV6-5-4 are both steel grades. Both yield at about 550 MPa — strength does not separate them. 42CrMo4 is the more ductile: elongation 14% versus 12% for X82WMoCrV6-5-4.
Which is cheaper, 42CrMo4 or X82WMoCrV6-5-4?
42CrMo4 is the lower-cost material: it sits in the standard tier ($$) while X82WMoCrV6-5-4 is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, 42CrMo4 or X82WMoCrV6-5-4?
42CrMo4, by a small margin. Both rate fair for machinability — 50/100 against 35/100 for X82WMoCrV6-5-4; for welding the order is 42CrMo4 first (fair, 35/100) then X82WMoCrV6-5-4 (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 42CrMo4 and X82WMoCrV6-5-4 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.