Steel 25Cr2MoVA vs 31CrMoV9
Steel · grade comparison
Steel 25Cr2MoVA and 31CrMoV9 are both steel grades, both heat resistant steel. 31CrMoV9 is the stronger of the two: tensile strength 1,100 MPa (160 ksi) against 1,000 MPa (145 ksi) for 25Cr2MoVA, about 10% more. In exchange, 25Cr2MoVA is the more ductile: elongation 16% versus 12% for 31CrMoV9, and 31CrMoV9 is harder (330 HB vs 300 HB). 25Cr2MoVA runs hotter in service (520°C vs 450°C continuous). On the shop floor, 25Cr2MoVA welds better (32 vs 20 out of 100).
25Cr2MoVAChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
31CrMoV9Choose it when strength drives the design.
25Cr2MoVA vs 31CrMoV9: 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.
Shear Modulus
Bulk 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 C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Liquidus Temperature
Same in both: Density 7.85 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
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Max Service Temperature (continuous)
Same in both: Min Service Temperature -40°C-40 °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 %) 45% · Brazeability / Solderability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 60 L/kg7.2 gal/lb
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) 26.8 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 | 25Cr2MoVA | 31CrMoV9 |
|---|---|---|
| Default condition | Q&T | Q&T |
| Relative cost | $$ Standard | $$ Standard |
| Min. machined wall | 0.8 mm | 0.8 mm |
| Best machined surface | Ra 1.6 µm | Ra 1.6 µm |
Both are offered for CNC machining and Sheet metal. Both take the same 38 finishes: AlCrN, AlTiN, Black Oxide, CVD Al2O3, CVD TiCN, CVD TiN, Cerakote, Chrome Plating, Copper Plating, CrN, DLC, E-Coating and 26 more.
25Cr2MoVA vs 31CrMoV9 — frequently asked
Is 31CrMoV9 stronger than 25Cr2MoVA?
Yes. 31CrMoV9 has a typical tensile strength of 1,100 MPa (160 ksi) against 1,000 MPa (145 ksi) for 25Cr2MoVA — about 10% more.
Which is cheaper, 25Cr2MoVA or 31CrMoV9?
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 welds better, 25Cr2MoVA or 31CrMoV9?
25Cr2MoVA. Its weldability rates poor (32/100) against poor (20/100) for 31CrMoV9.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 25Cr2MoVA and 31CrMoV9 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.