Steel AR450 Q&T vs AR450 Q&T-HW
Steel · AR450 temper comparison
AR450 Q&T and AR450 Q&T-HW are two conditions of the same steel grade, AR450: Q&T (quenched and tempered) versus Q&T-HW (heavy-gauge plate (>~50 mm), reduced core hardness). The chemistry is identical, so every difference below comes from the condition. AR450 Q&T is the stronger of the two: yield strength 1,250 MPa (181 ksi) against 1,150 MPa (167 ksi) for AR450 Q&T-HW, about 9% more; tensile strength follows at 1,450 MPa (210 ksi) vs 1,350 MPa (196 ksi).
AR450 Q&TChoose it when strength drives the design.
AR450 Q&T vs AR450 Q&T-HW: 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
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 80 GPa11.6 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Reduction in Area 40%
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 35 W/m·K20.2 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 Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
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.
Weldability
Formability (cold)
Same in both: Machinability 18 / 100 · Machinability Rating (AISI 1212 = 100 %) 15% · Polishability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
AR450 Q&T vs AR450 Q&T-HW — frequently asked
Is AR450 Q&T stronger than AR450 Q&T-HW?
Yes. AR450 Q&T has a typical yield strength of 1,250 MPa (181 ksi) against 1,150 MPa (167 ksi) for AR450 Q&T-HW — about 9% more. Tensile strength is 1,450 MPa (210 ksi) vs 1,350 MPa (196 ksi).
Which condition does FabDigit quote by default, Q&T or Q&T-HW?
Q&T is the default AR450 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.
When should I choose AR450 Q&T over AR450 Q&T-HW?
Pick AR450 Q&T when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in AR450 Q&T and AR450 Q&T-HW 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.