Steel 08F Carburized vs 08F-HR
Steel · 08F temper comparison
08F Carburized and 08F-HR are two conditions of the same steel grade, 08F: Carburized (carburized and hardened) versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. 08F Carburized is the stronger of the two: yield strength 320 MPa (46.4 ksi) against 195 MPa (28.3 ksi) for 08F-HR, about 64% more; tensile strength follows at 500 MPa (72.5 ksi) vs 320 MPa (46.4 ksi). In exchange, 08F-HR is the more ductile: elongation 38% versus 12% for 08F Carburized, and 08F Carburized is harder (610 HB vs 110 HB). 08F-HR runs hotter in service (400°C vs 180°C continuous) and 08F-HR conducts heat better (60 W/m·K vs 50 W/m·K). On the shop floor, 08F-HR machines more easily (fair vs poor) and 08F-HR welds better (excellent vs poor).
08F CarburizedChoose it when strength drives the design.
08F-HRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
08F Carburized vs 08F-HR: 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)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,495°C2,723 °F · Liquidus Temperature 1,527°C2,781 °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 480 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12 µm/m·K6.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -20°C-4 °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) -0.61 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: Brazeability / Solderability 70 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 2.1 kg CO₂/kg · Embodied Water 40 L/kg4.8 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.
08F Carburized vs 08F-HR — frequently asked
Is 08F Carburized stronger than 08F-HR?
Yes. 08F Carburized has a typical yield strength of 320 MPa (46.4 ksi) against 195 MPa (28.3 ksi) for 08F-HR — about 64% more. Tensile strength is 500 MPa (72.5 ksi) vs 320 MPa (46.4 ksi).
Which condition does FabDigit quote by default, Carburized or HR?
CR-Annealed is the default 08F condition in the FabDigit quote flow (neither Carburized nor HR). 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, 08F Carburized or 08F-HR?
08F-HR. Its machinability rates fair (45/100) against poor (15/100) for 08F Carburized; for welding the order is 08F-HR first (excellent, 95/100) then 08F Carburized (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 08F Carburized and 08F-HR 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.