Steel Hardox 400 Q&T vs Hardox 400 Q&T Thin
Steel · Hardox 400 temper comparison
Hardox 400 Q&T and Hardox 400 Q&T Thin are two conditions of the same steel grade, Hardox 400: Q&T (quenched and tempered) versus Q&T Thin (Q&T Thin plate 3–20 mm). The chemistry is identical, so every difference below comes from the condition. Both yield at about 1,000 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (quenched and tempered versus Q&T Thin plate 3–20 mm). For most parts the choice follows the drawing's specified condition; ask for the one your standard calls out.
Hardox 400 Q&T vs Hardox 400 Q&T Thin: 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 Thin
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elongation at Break
Reduction in Area
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
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 · Tensile Strength (Ultimate) 1,250 MPa181 ksi · Yield Strength (0.2% offset) 1,000 MPa145 ksi · Compressive Strength 1,000 MPa145 ksi · Shear Strength 750 MPa109 ksi · Charpy V-Notch Impact (RT) 45 J33.2 ft·lbf · Hardness, Brinell 400 HB · Hardness, Rockwell C 43 HRC · Hardness, Vickers 420 HV
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.
Weldability
Formability (cold)
Same in both: Machinability 25 / 100 · Machinability Rating (AISI 1212 = 100 %) 20% · 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 Thin — frequently asked
What is the difference between Hardox 400 Q&T and Hardox 400 Q&T Thin?
Hardox 400 Q&T and Hardox 400 Q&T Thin are two conditions of the same steel grade, Hardox 400: Q&T (quenched and tempered) versus Q&T Thin (Q&T Thin plate 3–20 mm). The chemistry is identical, so every difference below comes from the condition. Both yield at about 1,000 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (quenched and tempered versus Q&T Thin plate 3–20 mm).
Which condition does FabDigit quote by default, Q&T or Q&T Thin?
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 Thin?
Hardox 400 Q&T Thin. Its weldability rates good (65/100) against good (60/100) for Hardox 400 Q&T.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Hardox 400 Q&T and Hardox 400 Q&T Thin 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.