Steel 4Cr5MoSiV vs 5CrMnMo
Steel · grade comparison
Steel 4Cr5MoSiV and 5CrMnMo are both steel grades. Both yield at about 500 MPa — strength does not separate them. 4Cr5MoSiV is the more ductile: elongation 22% versus 18% for 5CrMnMo. 5CrMnMo conducts heat better (34 W/m·K vs 24.5 W/m·K). On the shop floor, 5CrMnMo sits in a lower cost tier (budget, $) than 4Cr5MoSiV (standard, $$).
4Cr5MoSiVChoose it when the part is bent, formed or impact-loaded.
5CrMnMoChoose it when cost is the deciding factor.
4Cr5MoSiV vs 5CrMnMo: 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.
Bulk Modulus
Poisson's Ratio
Elongation at Break
Reduction in Area
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Fracture Toughness (K_IC)
Hardness, Rockwell C
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Tensile Strength (Ultimate) 780 MPa113 ksi · Yield Strength (0.2% offset) 500 MPa72.5 ksi · Compressive Strength 520 MPa75.4 ksi · Shear Strength 470 MPa68.2 ksi
Physical
Density and transition temperatures.
Liquidus Temperature
Same in both: Density 7.8 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -20°C-4 °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 Rating (AISI 1212 = 100 %)
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Same in both: Machinability 55 / 100 · Weldability 35 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Carbon (primary production)
Embodied Water
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Typical Recycled Content 45%
Common Calculations
Ratios derived from the values above.
Thermal Diffusivity
Thermal Shock Resistance Index
Same in both: Specific Strength (UTS / density) 100 kN·m/kg · Specific Stiffness (E / density) 26.9 MN·m/kg · Modulus of Resilience 595 kJ/m³
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 | 4Cr5MoSiV | 5CrMnMo |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$ Standard | $ Budget |
| 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.
4Cr5MoSiV vs 5CrMnMo — frequently asked
What is the difference between 4Cr5MoSiV and 5CrMnMo?
Steel 4Cr5MoSiV and 5CrMnMo are both steel grades. Both yield at about 500 MPa — strength does not separate them. 4Cr5MoSiV is the more ductile: elongation 22% versus 18% for 5CrMnMo.
Which is cheaper, 4Cr5MoSiV or 5CrMnMo?
5CrMnMo is the lower-cost material: it sits in the budget tier ($) while 4Cr5MoSiV is standard ($$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
When should I choose 4Cr5MoSiV over 5CrMnMo?
Pick 4Cr5MoSiV when the part is bent, formed or impact-loaded. Pick 5CrMnMo when cost is the deciding factor.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4Cr5MoSiV and 5CrMnMo 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.