Steel Hardox 400 Q&T vs Hardox 400 Q&T THICK
Steel · Hardox 400 temper comparison
Hardox 400 Q&T and Hardox 400 Q&T THICK are two conditions of the same steel grade, Hardox 400: Q&T (quenched and tempered) versus Q&T THICK (Q&T Thick plate >20–130 mm). The chemistry is identical, so every difference below comes from the condition. Hardox 400 Q&T is the stronger of the two: yield strength 1,000 MPa (145 ksi) against 950 MPa (138 ksi) for Hardox 400 Q&T THICK, about 5% more. On the shop floor, Hardox 400 Q&T welds better (good vs fair) and Hardox 400 Q&T forms better (fair vs poor).
Hardox 400 Q&TChoose it when strength drives the design, or when it will be welded.
Hardox 400 Q&T vs Hardox 400 Q&T THICK: 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.
Hardox 400 Q&THardox 400 Q&T THICK
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3 · Elongation at Break 10% · Fracture Toughness (K_IC) 70 MPa·√m63.7 ksi·√in · Charpy V-Notch Impact (RT) 45 J33.2 ft·lbf
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 34 W/m·K19.6 BTU/hr·ft·°F · Specific Heat Capacity 460 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 270 J/g116 BTU/lb · Max Service Temperature (continuous) 250°C482 °F · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7 % IACS · Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: 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: Polishability 55 / 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 40 L/kg4.8 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.
Hardox 400 Q&T vs Hardox 400 Q&T THICK — frequently asked
Is Hardox 400 Q&T stronger than Hardox 400 Q&T THICK?
Yes. Hardox 400 Q&T has a typical yield strength of 1,000 MPa (145 ksi) against 950 MPa (138 ksi) for Hardox 400 Q&T THICK — about 5% more. Tensile strength is 1,250 MPa (181 ksi) vs 1,200 MPa (174 ksi).
Which condition does FabDigit quote by default, Q&T or Q&T THICK?
Q&T is the default Hardox 400 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, Hardox 400 Q&T or Hardox 400 Q&T THICK?
Hardox 400 Q&T. Its weldability rates good (60/100) against fair (50/100) for Hardox 400 Q&T THICK.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Hardox 400 Q&T and Hardox 400 Q&T THICK 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.