Steel SUJ1 Annealed vs SUJ1-IH
Steel · SUJ1 temper comparison
SUJ1 Annealed and SUJ1-IH are two conditions of the same steel grade, SUJ1: Annealed versus IH (induction hardened). The chemistry is identical, so every difference below comes from the condition. SUJ1-IH is the stronger of the two: yield strength 950 MPa (138 ksi) against 400 MPa (58 ksi) for SUJ1 Annealed, about 138% more; tensile strength follows at 1,100 MPa (160 ksi) vs 660 MPa (95.7 ksi). In exchange, SUJ1 Annealed is the more ductile: elongation 22% versus 6% for SUJ1-IH, and SUJ1-IH is harder (650 HB vs 190 HB). SUJ1 Annealed runs hotter in service (150°C vs 120°C continuous) and SUJ1 Annealed conducts electricity better (6.5 % IACS vs 5.6 % IACS). 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-IHChoose it when strength drives the design.
SUJ1 Annealed vs SUJ1-IH: 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, Brinell
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 0.3 · 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.
Electrical Conductivity
Electrical Resistivity
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 %)
Weldability
Formability (cold)
Same in both: Castability 30 / 100 · Brazeability / Solderability 35 / 100 · Polishability 80 / 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-IH — frequently asked
Is SUJ1-IH stronger than SUJ1 Annealed?
Yes. SUJ1-IH has a typical yield strength of 950 MPa (138 ksi) against 400 MPa (58 ksi) for SUJ1 Annealed — about 138% more. Tensile strength is 1,100 MPa (160 ksi) vs 660 MPa (95.7 ksi).
Which condition does FabDigit quote by default, Annealed or IH?
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-IH?
SUJ1 Annealed. Its machinability rates fair (42/100) against not recommended (8/100) for SUJ1-IH; for welding the order is SUJ1 Annealed first (not recommended, 12/100) then SUJ1-IH (not recommended, 4/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in SUJ1 Annealed and SUJ1-IH 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.