Steel H22-HR vs H22-QT45
Steel · H22 temper comparison
H22-HR and H22-QT45 are two conditions of the same steel grade, H22: HR (hot rolled) versus QT45 (hardened & tempered 44–46 HRC). The chemistry is identical, so every difference below comes from the condition. H22-QT45 is the stronger of the two: yield strength 1,250 MPa (181 ksi) against 900 MPa (131 ksi) for H22-HR, about 39% more; tensile strength follows at 1,470 MPa (213 ksi) vs 1,150 MPa (167 ksi). In exchange, H22-HR is the more ductile: elongation 10% versus 9% for H22-QT45, and H22-QT45 is harder (421 HB vs 340 HB). H22-QT45 runs hotter in service (620°C vs 500°C continuous).
H22-HRChoose it when the part is bent, formed or impact-loaded.
H22-QT45Choose it when strength drives the design, or when the part sees heat.
H22-HR vs H22-QT45: 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)
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 · Fracture Toughness (K_IC) 32 MPa·√m29.1 ksi·√in · 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.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: 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.
Electrical Conductivity
Electrical Resistivity
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
Formability (cold)
Same in both: 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-HR vs H22-QT45 — frequently asked
Is H22-QT45 stronger than H22-HR?
Yes. H22-QT45 has a typical yield strength of 1,250 MPa (181 ksi) against 900 MPa (131 ksi) for H22-HR — about 39% more. Tensile strength is 1,470 MPa (213 ksi) vs 1,150 MPa (167 ksi).
Which condition does FabDigit quote by default, HR or QT45?
ANN is the default H22 condition in the FabDigit quote flow (neither HR nor QT45). 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-HR or H22-QT45?
H22-HR. Its machinability rates poor (18/100) against not recommended (12/100) for H22-QT45; for welding the order is H22-QT45 first (poor, 20/100) then H22-HR (not recommended, 12/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in H22-HR and H22-QT45 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.