Steel XAR 400 QT-400HB vs XAR 400 QT-400HB-THICK
Steel · XAR 400 temper comparison
XAR 400 QT-400HB and XAR 400 QT-400HB-THICK are two conditions of the same steel grade, XAR 400: QT-400HB versus QT-400HB-THICK (Q&T 400 HB heavy gauge). The chemistry is identical, so every difference below comes from the condition. XAR 400 QT-400HB is the stronger of the two: yield strength 1,000 MPa (145 ksi) against 950 MPa (138 ksi) for XAR 400 QT-400HB-THICK, about 5% more; tensile strength follows at 1,250 MPa (181 ksi) vs 1,180 MPa (171 ksi). XAR 400 QT-400HB is harder — 400 HB against 380 HB for XAR 400 QT-400HB-THICK — which matters for wear surfaces and threads. On the shop floor, XAR 400 QT-400HB welds better (good vs fair) and XAR 400 QT-400HB forms better (fair vs poor).
XAR 400 QT-400HBChoose it when strength drives the design, or when surface hardness matters.
XAR 400 QT-400HB vs XAR 400 QT-400HB-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.
XAR 400 QT-400HBXAR 400 QT-400HB-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)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Elongation at Break 10%
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 42 W/m·K24.3 BTU/hr·ft·°F · 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 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 2.4×10⁻⁷ Ω·m9.45 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 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 25 / 100 · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 31 MJ/kg13,328 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
XAR 400 QT-400HB vs XAR 400 QT-400HB-THICK — frequently asked
Is XAR 400 QT-400HB stronger than XAR 400 QT-400HB-THICK?
Yes. XAR 400 QT-400HB has a typical yield strength of 1,000 MPa (145 ksi) against 950 MPa (138 ksi) for XAR 400 QT-400HB-THICK — about 5% more. Tensile strength is 1,250 MPa (181 ksi) vs 1,180 MPa (171 ksi).
Which condition does FabDigit quote by default, QT-400HB or QT-400HB-THICK?
QT-400HB is the default XAR 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, XAR 400 QT-400HB or XAR 400 QT-400HB-THICK?
XAR 400 QT-400HB. Its weldability rates good (60/100) against fair (50/100) for XAR 400 QT-400HB-THICK.
Ready to make it?
Upload a CAD file and FabDigit prices the part in XAR 400 QT-400HB and XAR 400 QT-400HB-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.