Steel CPM M4-ANN vs CPM M4 HT62-64
Steel · CPM M4 temper comparison
CPM M4-ANN and CPM M4 HT62-64 are two conditions of the same steel grade, CPM M4: ANN (annealed) versus HT62-64 (hardened & tempered to 62–64 HRC). The chemistry is identical, so every difference below comes from the condition. CPM M4 HT62-64 is the stronger of the two: tensile strength 2,400 MPa (348 ksi) against 850 MPa (123 ksi) for CPM M4-ANN, about 182% more. CPM M4 HT62-64 is harder — 63 HRC against 23 HRC for CPM M4-ANN — which matters for wear surfaces and threads. On the shop floor, CPM M4-ANN machines more easily (poor vs not recommended).
CPM M4-ANNChoose it when the part is machined in volume.
CPM M4 HT62-64Choose it when strength drives the design, or when surface hardness matters.
CPM M4-ANN vs CPM M4 HT62-64: 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)
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 221 GPa32.1 Msi · Shear Modulus 84 GPa12.2 Msi · Bulk Modulus 168 GPa24.4 Msi · Poisson's Ratio 0.28 · Yield Strength (0.2% offset) 550 MPa79.8 ksi · Elongation at Break 12% · Reduction in Area 22% · Shear Strength 520 MPa75.4 ksi · Hardness, Brinell 241 HB · Hardness, Rockwell B 99 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.97 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,250°C2,282 °F · Liquidus Temperature 1,400°C2,552 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 24 W/m·K13.9 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.2 µm/m·K6.2 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 540°C1,004 °F · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.6×10⁻⁷ Ω·m22 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.5 V · Corrosion Resistance 18 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Polishability
Same in both: Weldability 20 / 100 · Formability (cold) 14 / 100 · Brazeability / Solderability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 75 MJ/kg32,244 BTU/lb · Embodied Carbon (primary production) 5.2 kg CO₂/kg · Embodied Water 110 L/kg13.2 gal/lb · Typical Recycled Content 20%
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.
CPM M4-ANN vs CPM M4 HT62-64 — frequently asked
Is CPM M4 HT62-64 stronger than CPM M4-ANN?
Yes. CPM M4 HT62-64 has a typical tensile strength of 2,400 MPa (348 ksi) against 850 MPa (123 ksi) for CPM M4-ANN — about 182% more.
Which condition does FabDigit quote by default, ANN or HT62-64?
ANN is the default CPM M4 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, CPM M4-ANN or CPM M4 HT62-64?
CPM M4-ANN. Its machinability rates poor (25/100) against not recommended (5/100) for CPM M4 HT62-64.
Ready to make it?
Upload a CAD file and FabDigit prices the part in CPM M4-ANN and CPM M4 HT62-64 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.