Steel 41CrAlMo7-10 +A vs 41CrAlMo7-10 +QT650
Steel · 41CrAlMo7-10 temper comparison
41CrAlMo7-10 +A and 41CrAlMo7-10 +QT650 are two conditions of the same steel grade, 41CrAlMo7-10: +A (annealed) versus +QT650 (quenched and tempered, Rp0.2 ≥ 650 MPa). The chemistry is identical, so every difference below comes from the condition. 41CrAlMo7-10 +QT650 is the stronger of the two: yield strength 700 MPa (102 ksi) against 460 MPa (66.7 ksi) for 41CrAlMo7-10 +A, about 52% more; tensile strength follows at 950 MPa (138 ksi) vs 760 MPa (110 ksi). In exchange, 41CrAlMo7-10 +A is the more ductile: elongation 18% versus 15% for 41CrAlMo7-10 +QT650, and 41CrAlMo7-10 +QT650 is harder (290 HB vs 225 HB). 41CrAlMo7-10 +QT650 runs hotter in service (500°C vs 450°C continuous). On the shop floor, 41CrAlMo7-10 +A machines more easily (good vs fair).
41CrAlMo7-10 +AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
41CrAlMo7-10 +QT650Choose it when strength drives the design, or when the part sees heat.
41CrAlMo7-10 +A vs 41CrAlMo7-10 +QT650: 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.
41CrAlMo7-10 +A41CrAlMo7-10 +QT650
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
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 · 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 7.75 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 34 W/m·K19.6 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 15 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 15 / 100 · Castability 20 / 100 · Brazeability / Solderability 30 / 100 · Polishability 65 / 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 30%
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.
41CrAlMo7-10 +A vs 41CrAlMo7-10 +QT650 — frequently asked
Is 41CrAlMo7-10 +QT650 stronger than 41CrAlMo7-10 +A?
Yes. 41CrAlMo7-10 +QT650 has a typical yield strength of 700 MPa (102 ksi) against 460 MPa (66.7 ksi) for 41CrAlMo7-10 +A — about 52% more. Tensile strength is 950 MPa (138 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, +A or +QT650?
+QT750 is the default 41CrAlMo7-10 condition in the FabDigit quote flow (neither +A nor +QT650). 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, 41CrAlMo7-10 +A or 41CrAlMo7-10 +QT650?
41CrAlMo7-10 +A. Its machinability rates good (55/100) against fair (43/100) for 41CrAlMo7-10 +QT650.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 41CrAlMo7-10 +A and 41CrAlMo7-10 +QT650 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.