Steel A709 HPS100W-QT vs A709 HPS100W QT-HEAVY
Steel · A709 HPS100W temper comparison
A709 HPS100W-QT and A709 HPS100W QT-HEAVY are two conditions of the same steel grade, A709 HPS100W: QT (quenched and tempered) versus QT-HEAVY (Q&T heavy plate). The chemistry is identical, so every difference below comes from the condition. A709 HPS100W-QT is the stronger of the two: yield strength 740 MPa (107 ksi) against 680 MPa (98.6 ksi) for A709 HPS100W QT-HEAVY, about 9% more; tensile strength follows at 830 MPa (120 ksi) vs 780 MPa (113 ksi). A709 HPS100W-QT is harder — 255 HB against 240 HB for A709 HPS100W QT-HEAVY — which matters for wear surfaces and threads.
A709 HPS100W-QTChoose it when strength drives the design, or when surface hardness matters.
A709 HPS100W-QT vs A709 HPS100W 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.
A709 HPS100W-QTA709 HPS100W QT-HEAVY
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 200 GPa29 Msi · Shear Modulus 79 GPa11.5 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Elongation at Break 20%
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °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 38 W/m·K22 BTU/hr·ft·°F · Specific Heat Capacity 470 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.7 µm/m·K6.5 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °F · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 6.6 % IACS · Electrical Resistivity 2.6×10⁻⁷ Ω·m10.2 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.58 V · Corrosion Resistance 26 / 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) 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 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.
A709 HPS100W-QT vs A709 HPS100W QT-HEAVY — frequently asked
Is A709 HPS100W-QT stronger than A709 HPS100W QT-HEAVY?
Yes. A709 HPS100W-QT has a typical yield strength of 740 MPa (107 ksi) against 680 MPa (98.6 ksi) for A709 HPS100W QT-HEAVY — about 9% more. Tensile strength is 830 MPa (120 ksi) vs 780 MPa (113 ksi).
Which condition does FabDigit quote by default, QT or QT-HEAVY?
QT is the default A709 HPS100W 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 A709 HPS100W-QT over A709 HPS100W QT-HEAVY?
Pick A709 HPS100W-QT when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in A709 HPS100W-QT and A709 HPS100W 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.