Steel W9Mo3Cr4V-ANN vs W9Mo3Cr4V QT65-66
Steel · W9Mo3Cr4V temper comparison
W9Mo3Cr4V-ANN and W9Mo3Cr4V QT65-66 are two conditions of the same steel grade, W9Mo3Cr4V: ANN (annealed) versus QT65-66 (hardened & tempered, 64–66 HRC). The chemistry is identical, so every difference below comes from the condition. Both yield at about 550 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (annealed versus hardened & tempered, 64–66 HRC). W9Mo3Cr4V QT65-66 runs hotter in service (620°C vs 400°C continuous) and W9Mo3Cr4V-ANN conducts heat better (24 W/m·K vs 20 W/m·K). On the shop floor, W9Mo3Cr4V-ANN machines more easily (fair vs not recommended).
W9Mo3Cr4V-ANNChoose it when the part is machined in volume.
W9Mo3Cr4V QT65-66Choose it when the part sees heat.
W9Mo3Cr4V-ANN vs W9Mo3Cr4V QT65-66: 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.
W9Mo3Cr4V-ANNW9Mo3Cr4V QT65-66
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Compressive Strength
Charpy V-Notch Impact (RT)
Same in both: Shear Modulus 85 GPa12.3 Msi · Bulk Modulus 170 GPa24.7 Msi · Poisson's Ratio 0.29 · Tensile Strength (Ultimate) 850 MPa123 ksi · Yield Strength (0.2% offset) 550 MPa79.8 ksi · Elongation at Break 18% · Reduction in Area 35% · Hardness, Brinell 240 HB · Hardness, Rockwell B 100 HRB
Physical
Density and transition temperatures.
Same in both: Density 8.3 g/cm³0.3 lb/in³ · Melting Point (Solidus) 1,260°C2,300 °F · Liquidus Temperature 1,430°C2,606 °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 420 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.7 µm/m·K5.9 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.58 V · Corrosion Resistance 15 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Machinability Rating (AISI 1212 = 100 %) 45% · Weldability 25 / 100 · Formability (cold) 15 / 100 · Castability 30 / 100 · Brazeability / Solderability 60 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 60 MJ/kg25,795 BTU/lb · Embodied Carbon (primary production) 4.2 kg CO₂/kg · Embodied Water 80 L/kg9.6 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.
W9Mo3Cr4V-ANN vs W9Mo3Cr4V QT65-66 — frequently asked
What is the difference between W9Mo3Cr4V-ANN and W9Mo3Cr4V QT65-66?
W9Mo3Cr4V-ANN and W9Mo3Cr4V QT65-66 are two conditions of the same steel grade, W9Mo3Cr4V: ANN (annealed) versus QT65-66 (hardened & tempered, 64–66 HRC). The chemistry is identical, so every difference below comes from the condition. Both yield at about 550 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (annealed versus hardened & tempered, 64–66 HRC).
Which condition does FabDigit quote by default, ANN or QT65-66?
ANN is the default W9Mo3Cr4V condition in the FabDigit quote flow. 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, W9Mo3Cr4V-ANN or W9Mo3Cr4V QT65-66?
W9Mo3Cr4V-ANN. Its machinability rates fair (35/100) against not recommended (3/100) for W9Mo3Cr4V QT65-66.
Ready to make it?
Upload a CAD file and FabDigit prices the part in W9Mo3Cr4V-ANN and W9Mo3Cr4V QT65-66 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.