Steel 45SCD6-HR vs 45SCD6 QT-1500
Steel · 45SCD6 temper comparison
45SCD6-HR and 45SCD6 QT-1500 are two conditions of the same steel grade, 45SCD6: HR (hot rolled) versus QT-1500 (Q&T ~1500 MPa). The chemistry is identical, so every difference below comes from the condition. 45SCD6 QT-1500 is the stronger of the two: yield strength 1,330 MPa (193 ksi) against 640 MPa (92.8 ksi) for 45SCD6-HR, about 108% more; tensile strength follows at 1,500 MPa (218 ksi) vs 1,020 MPa (148 ksi). In exchange, 45SCD6-HR is the more ductile: elongation 12% versus 10% for 45SCD6 QT-1500, and 45SCD6 QT-1500 is harder (435 HB vs 295 HB). 45SCD6-HR runs hotter in service (400°C vs 300°C continuous) and 45SCD6-HR conducts heat better (42 W/m·K vs 36 W/m·K). On the shop floor, 45SCD6-HR machines more easily (fair vs poor) and 45SCD6-HR welds better (poor vs not recommended).
45SCD6-HRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
45SCD6 QT-1500Choose it when strength drives the design.
45SCD6-HR vs 45SCD6 QT-1500: 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 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 7.8 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 µm/m·K6.7 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 12 / 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 30 / 100 · Polishability 60 / 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 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.
45SCD6-HR vs 45SCD6 QT-1500 — frequently asked
Is 45SCD6 QT-1500 stronger than 45SCD6-HR?
Yes. 45SCD6 QT-1500 has a typical yield strength of 1,330 MPa (193 ksi) against 640 MPa (92.8 ksi) for 45SCD6-HR — about 108% more. Tensile strength is 1,500 MPa (218 ksi) vs 1,020 MPa (148 ksi).
Which condition does FabDigit quote by default, HR or QT-1500?
QT-1800 is the default 45SCD6 condition in the FabDigit quote flow (neither HR nor QT-1500). 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, 45SCD6-HR or 45SCD6 QT-1500?
45SCD6-HR. Its machinability rates fair (38/100) against poor (26/100) for 45SCD6 QT-1500; for welding the order is 45SCD6-HR first (poor, 22/100) then 45SCD6 QT-1500 (not recommended, 12/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 45SCD6-HR and 45SCD6 QT-1500 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.