Steel SUM32-A vs SUM32 CD-SR
Steel · SUM32 temper comparison
SUM32-A and SUM32 CD-SR are two conditions of the same steel grade, SUM32: A (solution annealed) versus CD-SR (cold Drawn + Stress Relieved). The chemistry is identical, so every difference below comes from the condition. SUM32 CD-SR is the stronger of the two: yield strength 395 MPa (57.3 ksi) against 285 MPa (41.3 ksi) for SUM32-A, about 39% more; tensile strength follows at 470 MPa (68.2 ksi) vs 430 MPa (62.4 ksi). In exchange, SUM32-A is the more ductile: elongation 33% versus 18% for SUM32 CD-SR, and SUM32 CD-SR is harder (143 HB vs 121 HB).
SUM32-AChoose it when the part is bent, formed or impact-loaded.
SUM32 CD-SRChoose it when strength drives the design.
SUM32-A vs SUM32 CD-SR: 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 205 GPa29.7 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 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 486 J/kg·K0.12 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) 350°C662 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Same in both: 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) -0.61 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 65 / 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 25%
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.
SUM32-A vs SUM32 CD-SR — frequently asked
Is SUM32 CD-SR stronger than SUM32-A?
Yes. SUM32 CD-SR has a typical yield strength of 395 MPa (57.3 ksi) against 285 MPa (41.3 ksi) for SUM32-A — about 39% more. Tensile strength is 470 MPa (68.2 ksi) vs 430 MPa (62.4 ksi).
Which condition does FabDigit quote by default, A or CD-SR?
CD is the default SUM32 condition in the FabDigit quote flow (neither A nor CD-SR). 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, SUM32-A or SUM32 CD-SR?
SUM32 CD-SR. Its machinability rates excellent (85/100) against very good (80/100) for SUM32-A; for welding the order is SUM32-A first (fair, 45/100) then SUM32 CD-SR (fair, 40/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in SUM32-A and SUM32 CD-SR 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.