Steel Creusabro 4000-QT vs Creusabro 4000 QT-HEAVY
Steel · Creusabro 4000 temper comparison
Creusabro 4000-QT and Creusabro 4000 QT-HEAVY are two conditions of the same steel grade, Creusabro 4000: QT (quenched and tempered) versus QT-HEAVY (QT). The chemistry is identical, so every difference below comes from the condition. Creusabro 4000-QT is the stronger of the two: yield strength 1,000 MPa (145 ksi) against 930 MPa (135 ksi) for Creusabro 4000 QT-HEAVY, about 8% more. On the shop floor, Creusabro 4000-QT forms better (45 vs 35 out of 100).
Creusabro 4000-QTChoose it when strength drives the design.
Creusabro 4000-QT vs Creusabro 4000 QT-HEAVY: 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.
Creusabro 4000-QTCreusabro 4000 QT-HEAVY
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)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 79 GPa11.5 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.3
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 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 36 W/m·K20.8 BTU/hr·ft·°F · 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 270 J/g116 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 2.4×10⁻⁷ Ω·m9.45 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 15 / 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: Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 55 L/kg6.6 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.
Creusabro 4000-QT vs Creusabro 4000 QT-HEAVY — frequently asked
Is Creusabro 4000-QT stronger than Creusabro 4000 QT-HEAVY?
Yes. Creusabro 4000-QT has a typical yield strength of 1,000 MPa (145 ksi) against 930 MPa (135 ksi) for Creusabro 4000 QT-HEAVY — about 8% more. Tensile strength is 1,250 MPa (181 ksi) vs 1,200 MPa (174 ksi).
Which condition does FabDigit quote by default, QT or QT-HEAVY?
QT is the default Creusabro 4000 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 welds better, Creusabro 4000-QT or Creusabro 4000 QT-HEAVY?
Creusabro 4000-QT. Its weldability rates good (60/100) against good (55/100) for Creusabro 4000 QT-HEAVY.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Creusabro 4000-QT and Creusabro 4000 QT-HEAVY 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.