Steel M10-ANN vs M10 HT-64-66
Steel · M10 temper comparison
M10-ANN and M10 HT-64-66 are two conditions of the same steel grade, M10: ANN (annealed) versus HT-64-66 (hardened & tempered 64–66 HRC). The chemistry is identical, so every difference below comes from the condition. M10 HT-64-66 is the stronger of the two: tensile strength 2,350 MPa (341 ksi) against 830 MPa (120 ksi) for M10-ANN, about 183% more. In exchange, M10-ANN is the more ductile: elongation 16% versus 0.3% for M10 HT-64-66, and M10 HT-64-66 is harder (65 HRC vs 22 HRC). M10 HT-64-66 runs hotter in service (580°C vs 250°C continuous). On the shop floor, M10-ANN machines more easily (fair vs not recommended).
M10-ANNChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
M10 HT-64-66Choose it when strength drives the design, or when the part sees heat.
M10-ANN vs M10 HT-64-66: 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.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Elongation at Break
Compressive Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 217 GPa31.5 Msi · Shear Modulus 84 GPa12.2 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Yield Strength (0.2% offset) 550 MPa79.8 ksi · Reduction in Area 28% · Shear Strength 520 MPa75.4 ksi · Hardness, Brinell 235 HB · Hardness, Rockwell B 99 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.88 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,290°C2,354 °F · Liquidus Temperature 1,430°C2,606 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 24 W/m·K13.9 BTU/hr·ft·°F · Specific Heat Capacity 420 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.4 µm/m·K5.8 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.2 % IACS · 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) -0.55 V · Corrosion Resistance 18 / 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 20 / 100 · Formability (cold) 15 / 100 · Castability 25 / 100 · Brazeability / Solderability 55 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.9 kg CO₂/kg · Embodied Water 70 L/kg8.4 gal/lb · Typical Recycled Content 40%
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.
M10-ANN vs M10 HT-64-66 — frequently asked
Is M10 HT-64-66 stronger than M10-ANN?
Yes. M10 HT-64-66 has a typical tensile strength of 2,350 MPa (341 ksi) against 830 MPa (120 ksi) for M10-ANN — about 183% more.
Which condition does FabDigit quote by default, ANN or HT-64-66?
ANN is the default M10 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, M10-ANN or M10 HT-64-66?
M10-ANN. Its machinability rates fair (42/100) against not recommended (4/100) for M10 HT-64-66.
Ready to make it?
Upload a CAD file and FabDigit prices the part in M10-ANN and M10 HT-64-66 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.