Steel SUJ2 Annealed vs SUJ2 Q&T
Steel · SUJ2 temper comparison
SUJ2 Annealed and SUJ2 Q&T are two conditions of the same steel grade, SUJ2: Annealed versus Q&T (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. SUJ2 Q&T is the stronger of the two: yield strength 1,900 MPa (276 ksi) against 420 MPa (60.9 ksi) for SUJ2 Annealed, about 4.5 times as much; tensile strength follows at 2,280 MPa (331 ksi) vs 660 MPa (95.7 ksi). In exchange, SUJ2 Annealed is the more ductile: elongation 25% versus 1.5% for SUJ2 Q&T, and SUJ2 Q&T is harder (760 HV vs 200 HV). SUJ2 Annealed runs hotter in service (200°C vs 120°C continuous) and SUJ2 Annealed conducts heat better (46 W/m·K vs 36 W/m·K). On the shop floor, SUJ2 Annealed machines more easily (fair vs not recommended).
SUJ2 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
SUJ2 Q&TChoose it when strength drives the design.
SUJ2 Annealed vs SUJ2 Q&T: 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 210 GPa30.5 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Brinell 192 HB · Hardness, Rockwell B 92 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.81 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,460°C2,660 °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) 11.9 µm/m·K6.6 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 % IACS · Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 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 %)
Weldability
Formability (cold)
Polishability
Same in both: Castability 30 / 100 · Brazeability / Solderability 35 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 55 L/kg6.6 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.
SUJ2 Annealed vs SUJ2 Q&T — frequently asked
Is SUJ2 Q&T stronger than SUJ2 Annealed?
Yes. SUJ2 Q&T has a typical yield strength of 1,900 MPa (276 ksi) against 420 MPa (60.9 ksi) for SUJ2 Annealed — about 4.5 times as much. Tensile strength is 2,280 MPa (331 ksi) vs 660 MPa (95.7 ksi).
Which condition does FabDigit quote by default, Annealed or Q&T?
Annealed is the default SUJ2 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, SUJ2 Annealed or SUJ2 Q&T?
SUJ2 Annealed. Its machinability rates fair (45/100) against not recommended (8/100) for SUJ2 Q&T; for welding the order is SUJ2 Annealed first (not recommended, 12/100) then SUJ2 Q&T (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in SUJ2 Annealed and SUJ2 Q&T 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.