Steel SUM23 Annealed vs SUM23-CR
Steel · SUM23 temper comparison
SUM23 Annealed and SUM23-CR are two conditions of the same steel grade, SUM23: Annealed versus CR (cold rolled). The chemistry is identical, so every difference below comes from the condition. SUM23-CR is the stronger of the two: yield strength 380 MPa (55.1 ksi) against 230 MPa (33.4 ksi) for SUM23 Annealed, about 65% more; tensile strength follows at 500 MPa (72.5 ksi) vs 380 MPa (55.1 ksi). In exchange, SUM23 Annealed is the more ductile: elongation 28% versus 12% for SUM23-CR, and SUM23-CR is harder (152 HB vs 111 HB).
SUM23 AnnealedChoose it when the part is bent, formed or impact-loaded.
SUM23-CRChoose it when strength drives the design.
SUM23 Annealed vs SUM23-CR: 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
Shear Strength
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
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 1,500°C2,732 °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 486 J/kg·K0.12 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 µin/in·°F · Latent Heat of Fusion 247 J/g106 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 10.8 % IACS · Electrical Resistivity 1.6×10⁻⁷ Ω·m6.3 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 8 / 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 20 / 100 · Brazeability / Solderability 60 / 100 · Polishability 40 / 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 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.
SUM23 Annealed vs SUM23-CR — frequently asked
Is SUM23-CR stronger than SUM23 Annealed?
Yes. SUM23-CR has a typical yield strength of 380 MPa (55.1 ksi) against 230 MPa (33.4 ksi) for SUM23 Annealed — about 65% more. Tensile strength is 500 MPa (72.5 ksi) vs 380 MPa (55.1 ksi).
Which condition does FabDigit quote by default, Annealed or CR?
HR is the default SUM23 condition in the FabDigit quote flow (neither Annealed nor CR). 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, SUM23 Annealed or SUM23-CR?
SUM23-CR, by a small margin. Both rate excellent for machinability — 95/100 against 88/100 for SUM23 Annealed.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SUM23 Annealed and SUM23-CR 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.