Steel 34CrAlMo5-10 +A vs 34CrAlMo5-10 +QT-500
Steel · 34CrAlMo5-10 temper comparison
34CrAlMo5-10 +A and 34CrAlMo5-10 +QT-500 are two conditions of the same steel grade, 34CrAlMo5-10: +A (annealed) versus +QT-500 (+QT). The chemistry is identical, so every difference below comes from the condition. 34CrAlMo5-10 +QT-500 is the stronger of the two: yield strength 620 MPa (89.9 ksi) against 450 MPa (65.3 ksi) for 34CrAlMo5-10 +A, about 38% more; tensile strength follows at 800 MPa (116 ksi) vs 720 MPa (104 ksi). In exchange, 34CrAlMo5-10 +A is the more ductile: elongation 20% versus 16% for 34CrAlMo5-10 +QT-500, and 34CrAlMo5-10 +QT-500 is harder (250 HB vs 220 HB). 34CrAlMo5-10 +QT-500 runs hotter in service (500°C vs 450°C continuous).
34CrAlMo5-10 +AChoose it when the part is bent, formed or impact-loaded.
34CrAlMo5-10 +QT-500Choose it when strength drives the design, or when the part sees heat.
34CrAlMo5-10 +A vs 34CrAlMo5-10 +QT-500: 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.
34CrAlMo5-10 +A34CrAlMo5-10 +QT-500
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 7.8 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) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
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 %)
Formability (cold)
Same in both: Weldability 20 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 31 MJ/kg13,328 BTU/lb · Embodied Carbon (primary production) 2.2 kg CO₂/kg · Embodied Water 55 L/kg6.6 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.
34CrAlMo5-10 +A vs 34CrAlMo5-10 +QT-500 — frequently asked
Is 34CrAlMo5-10 +QT-500 stronger than 34CrAlMo5-10 +A?
Yes. 34CrAlMo5-10 +QT-500 has a typical yield strength of 620 MPa (89.9 ksi) against 450 MPa (65.3 ksi) for 34CrAlMo5-10 +A — about 38% more. Tensile strength is 800 MPa (116 ksi) vs 720 MPa (104 ksi).
Which condition does FabDigit quote by default, +A or +QT-500?
+QT-100 is the default 34CrAlMo5-10 condition in the FabDigit quote flow (neither +A nor +QT-500). 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, 34CrAlMo5-10 +A or 34CrAlMo5-10 +QT-500?
34CrAlMo5-10 +A. Its machinability rates good (55/100) against fair (50/100) for 34CrAlMo5-10 +QT-500.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 34CrAlMo5-10 +A and 34CrAlMo5-10 +QT-500 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.