Steel 9Mn2V Q+T250 vs 9Mn2V-SR
Steel · 9Mn2V temper comparison
9Mn2V Q+T250 and 9Mn2V-SR are two conditions of the same steel grade, 9Mn2V: Q+T250 (oil quenched + tempered ~250 °C) versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. 9Mn2V Q+T250 is the stronger of the two: yield strength 1,650 MPa (239 ksi) against 430 MPa (62.4 ksi) for 9Mn2V-SR, about 3.8 times as much; tensile strength follows at 1,950 MPa (283 ksi) vs 730 MPa (106 ksi). In exchange, 9Mn2V-SR is the more ductile: elongation 14% versus 2.5% for 9Mn2V Q+T250, and 9Mn2V Q+T250 is harder (578 HB vs 220 HB). 9Mn2V Q+T250 runs hotter in service (220°C vs 200°C continuous). On the shop floor, 9Mn2V-SR machines more easily (fair vs not recommended) and 9Mn2V-SR welds better (poor vs not recommended).
9Mn2V Q+T250Choose it when strength drives the design, or when the part sees heat.
9Mn2V-SRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
9Mn2V Q+T250 vs 9Mn2V-SR: 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
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: Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.83 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,470°C2,678 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 12 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Castability 25 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 35%
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.
9Mn2V Q+T250 vs 9Mn2V-SR — frequently asked
Is 9Mn2V Q+T250 stronger than 9Mn2V-SR?
Yes. 9Mn2V Q+T250 has a typical yield strength of 1,650 MPa (239 ksi) against 430 MPa (62.4 ksi) for 9Mn2V-SR — about 3.8 times as much. Tensile strength is 1,950 MPa (283 ksi) vs 730 MPa (106 ksi).
Which condition does FabDigit quote by default, Q+T250 or SR?
A is the default 9Mn2V condition in the FabDigit quote flow (neither Q+T250 nor SR). The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, 9Mn2V Q+T250 or 9Mn2V-SR?
9Mn2V-SR. Its machinability rates fair (54/100) against not recommended (12/100) for 9Mn2V Q+T250; for welding the order is 9Mn2V-SR first (poor, 18/100) then 9Mn2V Q+T250 (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 9Mn2V Q+T250 and 9Mn2V-SR 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.