Steel F1-ANN vs F1-CH
Steel · F1 temper comparison
F1-ANN and F1-CH are two conditions of the same steel grade, F1: ANN (annealed) versus CH (carburized and hardened). The chemistry is identical, so every difference below comes from the condition. F1-CH is the stronger of the two: yield strength 1,000 MPa (145 ksi) against 420 MPa (60.9 ksi) for F1-ANN, about 138% more; tensile strength follows at 1,200 MPa (174 ksi) vs 700 MPa (102 ksi). In exchange, F1-ANN is the more ductile: elongation 20% versus 2% for F1-CH, and F1-CH is harder (750 HV vs 207 HV). F1-ANN runs hotter in service (300°C vs 200°C continuous) and F1-ANN conducts heat better (44 W/m·K vs 34 W/m·K). On the shop floor, F1-ANN machines more easily (good vs not recommended).
F1-ANNChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
F1-CHChoose it when strength drives the design.
F1-ANN vs F1-CH: 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
Reduction in Area
Compressive Strength
Shear 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 · Hardness, Brinell 197 HB · Hardness, Rockwell B 93 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.8 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,470°C2,678 °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 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.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 10 / 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 45 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 33 MJ/kg14,187 BTU/lb · Embodied Carbon (primary production) 2.3 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.
F1-ANN vs F1-CH — frequently asked
Is F1-CH stronger than F1-ANN?
Yes. F1-CH has a typical yield strength of 1,000 MPa (145 ksi) against 420 MPa (60.9 ksi) for F1-ANN — about 138% more. Tensile strength is 1,200 MPa (174 ksi) vs 700 MPa (102 ksi).
Which condition does FabDigit quote by default, ANN or CH?
ANN is the default F1 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, F1-ANN or F1-CH?
F1-ANN. Its machinability rates good (55/100) against not recommended (10/100) for F1-CH; for welding the order is F1-ANN first (not recommended, 12/100) then F1-CH (not recommended, 3/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in F1-ANN and F1-CH 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.