Steel F2-ANN vs F2 HT-56-58
Steel · F2 temper comparison
F2-ANN and F2 HT-56-58 are two conditions of the same steel grade, F2: ANN (annealed) versus HT-56-58 (hardened & Tempered 56–58 HRC). The chemistry is identical, so every difference below comes from the condition. F2 HT-56-58 is the stronger of the two: yield strength 1,650 MPa (239 ksi) against 430 MPa (62.4 ksi) for F2-ANN, about 3.8 times as much; tensile strength follows at 1,850 MPa (268 ksi) vs 760 MPa (110 ksi). In exchange, F2-ANN is the more ductile: elongation 22% versus 2% for F2 HT-56-58, and F2 HT-56-58 is harder (650 HV vs 235 HV). On the shop floor, F2-ANN machines more easily (fair vs not recommended).
F2-ANNChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
F2 HT-56-58Choose it when strength drives the design.
F2-ANN vs F2 HT-56-58: 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)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Reduction in Area 45% · Shear Strength 470 MPa68.2 ksi · Hardness, Brinell 223 HB · Hardness, Rockwell B 97 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.75 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,470°C2,678 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 30 W/m·K17.3 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.52 V · Corrosion Resistance 10 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Same in both: Machinability Rating (AISI 1212 = 100 %) 30% · Weldability 12 / 100 · Formability (cold) 30 / 100 · Brazeability / Solderability 40 / 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) 2.7 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
F2-ANN vs F2 HT-56-58 — frequently asked
Is F2 HT-56-58 stronger than F2-ANN?
Yes. F2 HT-56-58 has a typical yield strength of 1,650 MPa (239 ksi) against 430 MPa (62.4 ksi) for F2-ANN — about 3.8 times as much. Tensile strength is 1,850 MPa (268 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, ANN or HT-56-58?
ANN is the default F2 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, F2-ANN or F2 HT-56-58?
F2-ANN. Its machinability rates fair (40/100) against not recommended (8/100) for F2 HT-56-58.
Ready to make it?
Upload a CAD file and FabDigit prices the part in F2-ANN and F2 HT-56-58 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.