Steel SUM24L Annealed vs SUM24L-HR
Steel · SUM24L temper comparison
SUM24L Annealed and SUM24L-HR are two conditions of the same steel grade, SUM24L: Annealed versus HR (hot rolled). The chemistry is identical, so every difference below comes from the condition. SUM24L-HR is the stronger of the two: yield strength 235 MPa (34.1 ksi) against 220 MPa (31.9 ksi) for SUM24L Annealed, about 7% more; tensile strength follows at 395 MPa (57.3 ksi) vs 370 MPa (53.7 ksi). In exchange, SUM24L Annealed is the more ductile: elongation 25% versus 22% for SUM24L-HR, and SUM24L-HR is harder (121 HB vs 110 HB).
SUM24L AnnealedChoose it when the part is bent, formed or impact-loaded.
SUM24L-HRChoose it when strength drives the design.
SUM24L Annealed vs SUM24L-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
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Shear Strength 250 MPa36.3 ksi
Physical
Density and transition temperatures.
Same in both: Density 7.87 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,420°C2,588 °F · Liquidus Temperature 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 51 W/m·K29.5 BTU/hr·ft·°F · Specific Heat Capacity 480 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.7 µm/m·K6.5 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 280°C536 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 10 % IACS · Electrical Resistivity 1.7×10⁻⁷ Ω·m6.69 µΩ·in
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 %)
Formability (cold)
Same in both: Weldability 10 / 100 · Brazeability / Solderability 45 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 25 MJ/kg10,748 BTU/lb · Embodied Carbon (primary production) 1.9 kg CO₂/kg · Embodied Water 40 L/kg4.8 gal/lb · Typical Recycled Content 35%
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.
SUM24L Annealed vs SUM24L-HR — frequently asked
Is SUM24L-HR stronger than SUM24L Annealed?
Yes. SUM24L-HR has a typical yield strength of 235 MPa (34.1 ksi) against 220 MPa (31.9 ksi) for SUM24L Annealed — about 7% more. Tensile strength is 395 MPa (57.3 ksi) vs 370 MPa (53.7 ksi).
Which condition does FabDigit quote by default, Annealed or HR?
HR is the default SUM24L 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.
When should I choose SUM24L Annealed over SUM24L-HR?
Pick SUM24L Annealed when the part is bent, formed or impact-loaded. Pick SUM24L-HR when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SUM24L Annealed and SUM24L-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.