Steel M46-ANN vs M46-HT67
Steel · M46 temper comparison
M46-ANN and M46-HT67 are two conditions of the same steel grade, M46: ANN (annealed) versus HT67 (hardened & triple tempered). The chemistry is identical, so every difference below comes from the condition. M46-HT67 is the stronger of the two: yield strength 1,900 MPa (276 ksi) against 560 MPa (81.2 ksi) for M46-ANN, about 3.4 times as much; tensile strength follows at 2,100 MPa (305 ksi) vs 850 MPa (123 ksi). In exchange, M46-ANN is the more ductile: elongation 12% versus 0.5% for M46-HT67, and M46-HT67 is harder (940 HV vs 268 HV). M46-HT67 is stiffer (230 GPa vs 217 GPa) and M46-HT67 runs hotter in service (620°C vs 400°C continuous). On the shop floor, M46-ANN machines more easily (fair vs not recommended) and M46-ANN welds better (poor vs not recommended).
M46-ANNChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
M46-HT67Choose it when strength drives the design, or when the part sees heat.
M46-ANN vs M46-HT67: 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)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear 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 · Reduction in Area 20% · 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.
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) 10.8 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
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: 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-HT67 — frequently asked
Is M46-HT67 stronger than M46-ANN?
Yes. M46-HT67 has a typical yield strength of 1,900 MPa (276 ksi) against 560 MPa (81.2 ksi) for M46-ANN — about 3.4 times as much. Tensile strength is 2,100 MPa (305 ksi) vs 850 MPa (123 ksi).
Which condition does FabDigit quote by default, ANN or HT67?
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-HT67?
M46-ANN. Its machinability rates fair (35/100) against not recommended (5/100) for M46-HT67; for welding the order is M46-ANN first (poor, 15/100) then M46-HT67 (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in M46-ANN and M46-HT67 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.