Steel SUJ1 Annealed vs SUJ1 QT 58-62HRC
Steel · SUJ1 temper comparison
SUJ1 Annealed and SUJ1 QT 58-62HRC are two conditions of the same steel grade, SUJ1: Annealed versus QT 58-62HRC. The chemistry is identical, so every difference below comes from the condition. SUJ1 QT 58-62HRC is the stronger of the two: yield strength 1,800 MPa (261 ksi) against 400 MPa (58 ksi) for SUJ1 Annealed, about 4.5 times as much; tensile strength follows at 2,200 MPa (319 ksi) vs 660 MPa (95.7 ksi). In exchange, SUJ1 Annealed is the more ductile: elongation 22% versus 1% for SUJ1 QT 58-62HRC, and SUJ1 QT 58-62HRC is harder (720 HV vs 198 HV). SUJ1 Annealed runs hotter in service (150°C vs 120°C continuous) and SUJ1 Annealed conducts heat better (46 W/m·K vs 36 W/m·K). On the shop floor, SUJ1 Annealed machines more easily (fair vs not recommended).
SUJ1 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
SUJ1 QT 58-62HRCChoose it when strength drives the design.
SUJ1 Annealed vs SUJ1 QT 58-62HRC: 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, Vickers
Same in both: Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3 · Hardness, Brinell 190 HB · Hardness, Rockwell B 91 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.81 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °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 470 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 -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 6.5 % IACS · Electrical Resistivity 2.7×10⁻⁷ Ω·m10.6 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 %)
Formability (cold)
Polishability
Same in both: Weldability 12 / 100 · Castability 30 / 100 · Brazeability / Solderability 35 / 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 55 L/kg6.6 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.
SUJ1 Annealed vs SUJ1 QT 58-62HRC — frequently asked
Is SUJ1 QT 58-62HRC stronger than SUJ1 Annealed?
Yes. SUJ1 QT 58-62HRC has a typical yield strength of 1,800 MPa (261 ksi) against 400 MPa (58 ksi) for SUJ1 Annealed — about 4.5 times as much. Tensile strength is 2,200 MPa (319 ksi) vs 660 MPa (95.7 ksi).
Which condition does FabDigit quote by default, Annealed or QT 58-62HRC?
Annealed is the default SUJ1 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, SUJ1 Annealed or SUJ1 QT 58-62HRC?
SUJ1 Annealed. Its machinability rates fair (42/100) against not recommended (8/100) for SUJ1 QT 58-62HRC.
Ready to make it?
Upload a CAD file and FabDigit prices the part in SUJ1 Annealed and SUJ1 QT 58-62HRC 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.