Steel 8622-A vs 8622 QT-28-32HRC
Steel · 8622 temper comparison
8622-A and 8622 QT-28-32HRC are two conditions of the same steel grade, 8622: A (solution annealed) versus QT-28-32HRC. The chemistry is identical, so every difference below comes from the condition. 8622 QT-28-32HRC is the stronger of the two: yield strength 800 MPa (116 ksi) against 390 MPa (56.6 ksi) for 8622-A, about 105% more; tensile strength follows at 950 MPa (138 ksi) vs 550 MPa (79.8 ksi). In exchange, 8622-A is the more ductile: elongation 30% versus 17% for 8622 QT-28-32HRC, and 8622 QT-28-32HRC is harder (285 HB vs 163 HB). On the shop floor, 8622-A machines more easily (good vs fair).
8622-AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
8622 QT-28-32HRCChoose it when strength drives the design.
8622-A vs 8622 QT-28-32HRC: 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
Reduction in Area
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 390 MPa56.6 ksi · Hardness, Rockwell B 85 HRB
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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 46 W/m·K26.6 BTU/hr·ft·°F · Specific Heat Capacity 475 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.8 % IACS · Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 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.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Same in both: Weldability 50 / 100 · Formability (cold) 58 / 100 · Brazeability / Solderability 60 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 31 MJ/kg13,328 BTU/lb · Embodied Carbon (primary production) 2.2 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.
8622-A vs 8622 QT-28-32HRC — frequently asked
Is 8622 QT-28-32HRC stronger than 8622-A?
Yes. 8622 QT-28-32HRC has a typical yield strength of 800 MPa (116 ksi) against 390 MPa (56.6 ksi) for 8622-A — about 105% more. Tensile strength is 950 MPa (138 ksi) vs 550 MPa (79.8 ksi).
Which condition does FabDigit quote by default, A or QT-28-32HRC?
A is the default 8622 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.
Which is easier to machine, 8622-A or 8622 QT-28-32HRC?
8622-A. Its machinability rates good (60/100) against fair (48/100) for 8622 QT-28-32HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 8622-A and 8622 QT-28-32HRC 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.