Steel SUP11A-HR vs SUP11A QT-40-45HRC
Steel · SUP11A temper comparison
SUP11A-HR and SUP11A QT-40-45HRC are two conditions of the same steel grade, SUP11A: HR (hot rolled) versus QT-40-45HRC. The chemistry is identical, so every difference below comes from the condition. SUP11A QT-40-45HRC is the stronger of the two: yield strength 1,180 MPa (171 ksi) against 550 MPa (79.8 ksi) for SUP11A-HR, about 115% more; tensile strength follows at 1,330 MPa (193 ksi) vs 900 MPa (131 ksi). In exchange, SUP11A-HR is the more ductile: elongation 14% versus 11% for SUP11A QT-40-45HRC, and SUP11A QT-40-45HRC is harder (390 HB vs 270 HB). SUP11A-HR runs hotter in service (300°C vs 250°C continuous). On the shop floor, SUP11A-HR machines more easily (fair vs poor) and SUP11A-HR welds better (30 vs 15 out of 100).
SUP11A-HRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
SUP11A QT-40-45HRCChoose it when strength drives the design.
SUP11A-HR vs SUP11A QT-40-45HRC: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
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 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Reduction in Area 40%
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 1,480°C2,696 °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) 12.3 µm/m·K6.8 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) -0.6 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 %)
Weldability
Formability (cold)
Same in both: Brazeability / Solderability 25 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 27 MJ/kg11,608 BTU/lb · Embodied Carbon (primary production) 2.1 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 30%
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.
SUP11A-HR vs SUP11A QT-40-45HRC — frequently asked
Is SUP11A QT-40-45HRC stronger than SUP11A-HR?
Yes. SUP11A QT-40-45HRC has a typical yield strength of 1,180 MPa (171 ksi) against 550 MPa (79.8 ksi) for SUP11A-HR — about 115% more. Tensile strength is 1,330 MPa (193 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, HR or QT-40-45HRC?
QT-SPRING is the default SUP11A condition in the FabDigit quote flow (neither HR nor QT-40-45HRC). 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, SUP11A-HR or SUP11A QT-40-45HRC?
SUP11A-HR. Its machinability rates fair (35/100) against poor (22/100) for SUP11A QT-40-45HRC; for welding the order is SUP11A-HR first (poor, 30/100) then SUP11A QT-40-45HRC (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in SUP11A-HR and SUP11A QT-40-45HRC 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.