Steel SUP6 QT44-48 vs SUP6 QT48-52
Steel · SUP6 temper comparison
SUP6 QT44-48 and SUP6 QT48-52 are two conditions of the same steel grade, SUP6: QT44-48 (Q&T 44–48 HRC) versus QT48-52 (Q&T 48–52 HRC). The chemistry is identical, so every difference below comes from the condition. SUP6 QT48-52 is the stronger of the two: yield strength 1,620 MPa (235 ksi) against 1,450 MPa (210 ksi) for SUP6 QT44-48, about 12% more; tensile strength follows at 1,800 MPa (261 ksi) vs 1,620 MPa (235 ksi). In exchange, SUP6 QT44-48 is the more ductile: elongation 11% versus 8% for SUP6 QT48-52, and SUP6 QT48-52 is harder (495 HB vs 444 HB). SUP6 QT44-48 runs hotter in service (230°C vs 180°C continuous).
SUP6 QT44-48Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
SUP6 QT48-52Choose it when strength drives the design.
SUP6 QT44-48 vs SUP6 QT48-52: 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)
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 · Compressive Strength 1,500 MPa218 ksi · Shear Strength 980 MPa142 ksi
Physical
Density and transition temperatures.
Same in both: Density 7.75 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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · Specific Heat Capacity 475 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.
Same in both: Electrical Conductivity 6.6 % IACS · Electrical Resistivity 2.6×10⁻⁷ Ω·m10.2 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 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 %)
Same in both: Weldability 15 / 100 · Formability (cold) 8 / 100 · Castability 35 / 100 · Brazeability / Solderability 25 / 100 · Polishability 65 / 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 45 L/kg5.4 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.
SUP6 QT44-48 vs SUP6 QT48-52 — frequently asked
Is SUP6 QT48-52 stronger than SUP6 QT44-48?
Yes. SUP6 QT48-52 has a typical yield strength of 1,620 MPa (235 ksi) against 1,450 MPa (210 ksi) for SUP6 QT44-48 — about 12% more. Tensile strength is 1,800 MPa (261 ksi) vs 1,620 MPa (235 ksi).
Which condition does FabDigit quote by default, QT44-48 or QT48-52?
QT44-48 is the default SUP6 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.
Which is easier to machine, SUP6 QT44-48 or SUP6 QT48-52?
SUP6 QT44-48. Its machinability rates poor (22/100) against not recommended (14/100) for SUP6 QT48-52.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SUP6 QT44-48 and SUP6 QT48-52 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.