Steel H24 Annealed vs H24-HT45
Steel · H24 temper comparison
H24 Annealed and H24-HT45 are two conditions of the same steel grade, H24: Annealed versus HT45 (hardened & tempered). The chemistry is identical, so every difference below comes from the condition. H24-HT45 is the stronger of the two: yield strength 1,250 MPa (181 ksi) against 500 MPa (72.5 ksi) for H24 Annealed, about 150% more; tensile strength follows at 1,450 MPa (210 ksi) vs 840 MPa (122 ksi). In exchange, H24 Annealed is the more ductile: elongation 18% versus 9% for H24-HT45, and H24-HT45 is harder (421 HB vs 220 HB). H24-HT45 runs hotter in service (600°C vs 550°C continuous). On the shop floor, H24 Annealed machines more easily (fair vs not recommended) and H24 Annealed welds better (30 vs 20 out of 100).
H24 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
H24-HT45Choose it when strength drives the design, or when the part sees heat.
H24 Annealed vs H24-HT45: 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, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 207 GPa30 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Rockwell B 97 HRB
Physical
Density and transition temperatures.
Same in both: Density 8.55 g/cm³0.31 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 27 W/m·K15.6 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11 µm/m·K6.1 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.55 V · 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 40 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 42 MJ/kg18,057 BTU/lb · Embodied Carbon (primary production) 3.4 kg CO₂/kg · Embodied Water 70 L/kg8.4 gal/lb · Typical Recycled Content 40%
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.
H24 Annealed vs H24-HT45 — frequently asked
Is H24-HT45 stronger than H24 Annealed?
Yes. H24-HT45 has a typical yield strength of 1,250 MPa (181 ksi) against 500 MPa (72.5 ksi) for H24 Annealed — about 150% more. Tensile strength is 1,450 MPa (210 ksi) vs 840 MPa (122 ksi).
Which condition does FabDigit quote by default, Annealed or HT45?
Annealed is the default H24 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, H24 Annealed or H24-HT45?
H24 Annealed. Its machinability rates fair (35/100) against not recommended (12/100) for H24-HT45; for welding the order is H24 Annealed first (poor, 30/100) then H24-HT45 (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in H24 Annealed and H24-HT45 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.