Steel SUP13-CD vs SUP13 QT 40-44 HRC
Steel · SUP13 temper comparison
SUP13-CD and SUP13 QT 40-44 HRC are two conditions of the same steel grade, SUP13: CD (cold drawn) versus QT 40-44 HRC. The chemistry is identical, so every difference below comes from the condition. SUP13 QT 40-44 HRC is the stronger of the two: yield strength 1,200 MPa (174 ksi) against 900 MPa (131 ksi) for SUP13-CD, about 33% more; tensile strength follows at 1,330 MPa (193 ksi) vs 1,050 MPa (152 ksi). SUP13 QT 40-44 HRC is the more ductile: elongation 11% versus 8% for SUP13-CD, and SUP13 QT 40-44 HRC is harder (390 HB vs 310 HB). SUP13 QT 40-44 HRC runs hotter in service (300°C vs 200°C continuous). On the shop floor, SUP13-CD machines more easily (33 vs 16 out of 100).
SUP13-CDChoose it when the part is machined in volume.
SUP13 QT 40-44 HRCChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
SUP13-CD vs SUP13 QT 40-44 HRC: 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, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 206 GPa29.9 Msi · Shear Modulus 79.5 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Fracture Toughness (K_IC) 55 MPa·√m50.1 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.85 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.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.5 µm/m·K6.9 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °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 12 / 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 18 / 100 · Brazeability / Solderability 35 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.1 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
SUP13-CD vs SUP13 QT 40-44 HRC — frequently asked
Is SUP13 QT 40-44 HRC stronger than SUP13-CD?
Yes. SUP13 QT 40-44 HRC has a typical yield strength of 1,200 MPa (174 ksi) against 900 MPa (131 ksi) for SUP13-CD — about 33% more. Tensile strength is 1,330 MPa (193 ksi) vs 1,050 MPa (152 ksi).
Which condition does FabDigit quote by default, CD or QT 40-44 HRC?
QT 44-48 HRC is the default SUP13 condition in the FabDigit quote flow (neither CD nor QT 40-44 HRC). 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, SUP13-CD or SUP13 QT 40-44 HRC?
SUP13-CD, by a small margin. Both rate poor for machinability — 33/100 against 16/100 for SUP13 QT 40-44 HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SUP13-CD and SUP13 QT 40-44 HRC 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.