Steel H22-QT45 vs H22-QT54
Steel · H22 temper comparison
H22-QT45 and H22-QT54 are two conditions of the same steel grade, H22: QT45 (hardened & tempered 44–46 HRC) versus QT54 (hardened & tempered 53–55 HRC). The chemistry is identical, so every difference below comes from the condition. H22-QT54 is the stronger of the two: yield strength 1,620 MPa (235 ksi) against 1,250 MPa (181 ksi) for H22-QT45, about 30% more; tensile strength follows at 1,930 MPa (280 ksi) vs 1,470 MPa (213 ksi). In exchange, H22-QT45 is the more ductile: elongation 9% versus 4% for H22-QT54, and H22-QT45 is harder (421 HB vs 212 HB). H22-QT45 runs hotter in service (620°C vs 560°C continuous).
H22-QT45Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
H22-QT54Choose it when strength drives the design.
H22-QT45 vs H22-QT54: 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.
Elastic (Young's) Modulus
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, Vickers
Same in both: Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Rockwell B 95 HRB
Physical
Density and transition temperatures.
Same in both: Density 8.45 g/cm³0.31 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,475°C2,687 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 27 W/m·K15.6 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11 µm/m·K6.1 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.55 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Same in both: Formability (cold) 15 / 100 · Castability 25 / 100 · Brazeability / Solderability 35 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 52 MJ/kg22,356 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 75 L/kg9 gal/lb · Typical Recycled Content 45%
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.
H22-QT45 vs H22-QT54 — frequently asked
Is H22-QT54 stronger than H22-QT45?
Yes. H22-QT54 has a typical yield strength of 1,620 MPa (235 ksi) against 1,250 MPa (181 ksi) for H22-QT45 — about 30% more. Tensile strength is 1,930 MPa (280 ksi) vs 1,470 MPa (213 ksi).
Which condition does FabDigit quote by default, QT45 or QT54?
ANN is the default H22 condition in the FabDigit quote flow (neither QT45 nor QT54). 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 is easier to machine, H22-QT45 or H22-QT54?
H22-QT45, by a small margin. Both rate not recommended for machinability — 12/100 against 5/100 for H22-QT54; for welding the order is H22-QT45 first (poor, 20/100) then H22-QT54 (poor, 15/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in H22-QT45 and H22-QT54 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.