Steel P420QH QT-100-160 vs P420QH QT-50-100
Steel · P420QH temper comparison
P420QH QT-100-160 and P420QH QT-50-100 are two conditions of the same steel grade, P420QH: QT-100-160 (QT) versus QT-50-100 (QT). The chemistry is identical, so every difference below comes from the condition. P420QH QT-50-100 is the stronger of the two: yield strength 445 MPa (64.5 ksi) against 415 MPa (60.2 ksi) for P420QH QT-100-160, about 7% more. P420QH QT-50-100 is harder — 11 HRC against 9 HRC for P420QH QT-100-160 — which matters for wear surfaces and threads.
P420QH QT-50-100Choose it when strength drives the design, or when surface hardness matters.
P420QH QT-100-160 vs P420QH QT-50-100: 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.
P420QH QT-100-160P420QH QT-50-100
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
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 0.3
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 39 W/m·K22.5 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) 400°C752 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.2 % 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) -0.62 V · Corrosion Resistance 13 / 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 45 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 29 MJ/kg12,468 BTU/lb · Embodied Carbon (primary production) 2.1 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
P420QH QT-100-160 vs P420QH QT-50-100 — frequently asked
Is P420QH QT-50-100 stronger than P420QH QT-100-160?
Yes. P420QH QT-50-100 has a typical yield strength of 445 MPa (64.5 ksi) against 415 MPa (60.2 ksi) for P420QH QT-100-160 — about 7% more. Tensile strength is 570 MPa (82.7 ksi) vs 550 MPa (79.8 ksi).
Which condition does FabDigit quote by default, QT-100-160 or QT-50-100?
QT is the default P420QH condition in the FabDigit quote flow (neither QT-100-160 nor QT-50-100). 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 P420QH QT-100-160 over P420QH QT-50-100?
Pick P420QH QT-50-100 when strength drives the design, or when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in P420QH QT-100-160 and P420QH QT-50-100 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.