Steel 4Cr5MoSiV1 vs 5CrMnMo
Steel · grade comparison
Steel 4Cr5MoSiV1 and 5CrMnMo are both steel grades. 5CrMnMo is the stronger of the two: yield strength 500 MPa (72.5 ksi) against 460 MPa (66.7 ksi) for 4Cr5MoSiV1, about 9% more. In exchange, 4Cr5MoSiV1 is the more ductile: elongation 20% versus 18% for 5CrMnMo. 5CrMnMo conducts heat better (34 W/m·K vs 26 W/m·K). On the shop floor, 5CrMnMo machines more easily (good vs fair) and 5CrMnMo sits in a lower cost tier (budget, $) than 4Cr5MoSiV1 (standard, $$).
4Cr5MoSiV1Choose it when the part is bent, formed or impact-loaded.
5CrMnMoChoose it when strength drives the design, or when the part is machined in volume.
4Cr5MoSiV1 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.
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Hardness, Rockwell C
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi
Physical
Density and transition temperatures.
Melting Point (Solidus)
Liquidus Temperature
Same in both: Density 7.8 g/cm³0.28 lb/in³
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Min Service Temperature
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
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
Weldability
Formability (cold)
Castability
Polishability
Same in both: Machinability Rating (AISI 1212 = 100 %) 55% · Brazeability / Solderability 35 / 100
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 Strength (UTS / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Same in both: Specific Stiffness (E / density) 26.9 MN·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 | 4Cr5MoSiV1 | 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.
4Cr5MoSiV1 vs 5CrMnMo — frequently asked
Is 5CrMnMo stronger than 4Cr5MoSiV1?
Yes. 5CrMnMo has a typical yield strength of 500 MPa (72.5 ksi) against 460 MPa (66.7 ksi) for 4Cr5MoSiV1 — about 9% more. Tensile strength is 780 MPa (113 ksi) vs 760 MPa (110 ksi).
Which is cheaper, 4Cr5MoSiV1 or 5CrMnMo?
5CrMnMo is the lower-cost material: it sits in the budget tier ($) while 4Cr5MoSiV1 is standard ($$). 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, 4Cr5MoSiV1 or 5CrMnMo?
5CrMnMo. Its machinability rates good (55/100) against fair (45/100) for 4Cr5MoSiV1; for welding the order is 4Cr5MoSiV1 first (fair, 40/100) then 5CrMnMo (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4Cr5MoSiV1 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.