Steel M46-ANN vs M46-HT64
Steel · M46 temper comparison
M46-ANN and M46-HT64 are two conditions of the same steel grade, M46: ANN (annealed) versus HT64 (hardened & tempered). The chemistry is identical, so every difference below comes from the condition. M46-HT64 is the stronger of the two: tensile strength 2,300 MPa (334 ksi) against 850 MPa (123 ksi) for M46-ANN, about 171% more. M46-HT64 is harder — 830 HV against 268 HV for M46-ANN — which matters for wear surfaces and threads. M46-HT64 runs hotter in service (600°C vs 400°C continuous). On the shop floor, M46-ANN machines more easily (fair vs not recommended).
M46-ANNChoose it when the part is machined in volume.
M46-HT64Choose it when strength drives the design, or when surface hardness matters.
M46-ANN vs M46-HT64: 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)
Compressive Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Shear Modulus 84 GPa12.2 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Yield Strength (0.2% offset) 560 MPa81.2 ksi · Elongation at Break 12% · Reduction in Area 20% · Shear Strength 550 MPa79.8 ksi · Hardness, Brinell 255 HB · Hardness, Rockwell B 100 HRB
Physical
Density and transition temperatures.
Same in both: Density 8 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,270°C2,318 °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) 10.8 µm/m·K6 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 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.55 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Machinability Rating (AISI 1212 = 100 %) 40% · Weldability 15 / 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) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 4.2 kg CO₂/kg · Embodied Water 90 L/kg10.8 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.
M46-ANN vs M46-HT64 — frequently asked
Is M46-HT64 stronger than M46-ANN?
Yes. M46-HT64 has a typical tensile strength of 2,300 MPa (334 ksi) against 850 MPa (123 ksi) for M46-ANN — about 171% more.
Which condition does FabDigit quote by default, ANN or HT64?
ANN is the default M46 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, M46-ANN or M46-HT64?
M46-ANN. Its machinability rates fair (35/100) against not recommended (6/100) for M46-HT64.
Ready to make it?
Upload a CAD file and FabDigit prices the part in M46-ANN and M46-HT64 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.