Steel M48-ANN vs M48-HT65
Steel · M48 temper comparison
M48-ANN and M48-HT65 are two conditions of the same steel grade, M48: ANN (annealed) versus HT65 (hardened & triple tempered). The chemistry is identical, so every difference below comes from the condition. M48-HT65 is the stronger of the two: tensile strength 2,300 MPa (334 ksi) against 950 MPa (138 ksi) for M48-ANN, about 142% more. In exchange, M48-ANN is the more ductile: elongation 10% versus 0% for M48-HT65, and M48-HT65 is harder (66 HRC vs 26 HRC). M48-HT65 runs hotter in service (600°C vs 500°C continuous). On the shop floor, M48-ANN machines more easily (poor vs not recommended).
M48-ANNChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
M48-HT65Choose it when strength drives the design, or when the part sees heat.
M48-ANN vs M48-HT65: 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
Shear Strength
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 225 GPa32.6 Msi · Shear Modulus 87 GPa12.6 Msi · Bulk Modulus 168 GPa24.4 Msi · Poisson's Ratio 0.29 · Yield Strength (0.2% offset) 620 MPa89.9 ksi · Reduction in Area 18% · Hardness, Brinell 269 HB
Physical
Density and transition temperatures.
Same in both: Density 8.15 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,250°C2,282 °F · Liquidus Temperature 1,420°C2,588 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 23 W/m·K13.3 BTU/hr·ft·°F · Specific Heat Capacity 420 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.3 µm/m·K5.7 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 2.9 % IACS · Electrical Resistivity 6×10⁻⁷ Ω·m23.6 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 15 / 100
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) 60 MJ/kg25,795 BTU/lb · Embodied Carbon (primary production) 5.5 kg CO₂/kg · Embodied Water 120 L/kg14.4 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.
M48-ANN vs M48-HT65 — frequently asked
Is M48-HT65 stronger than M48-ANN?
Yes. M48-HT65 has a typical tensile strength of 2,300 MPa (334 ksi) against 950 MPa (138 ksi) for M48-ANN — about 142% more.
Which condition does FabDigit quote by default, ANN or HT65?
ANN is the default M48 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, M48-ANN or M48-HT65?
M48-ANN. Its machinability rates poor (25/100) against not recommended (5/100) for M48-HT65.
Ready to make it?
Upload a CAD file and FabDigit prices the part in M48-ANN and M48-HT65 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.