Steel 4J36 Annealed vs 4J36 HotRolled
Steel · 4J36 temper comparison
4J36 Annealed and 4J36 HotRolled are two conditions of the same steel grade, 4J36: Annealed versus HotRolled (hot rolled / hot forged, as-worked). The chemistry is identical, so every difference below comes from the condition. 4J36 HotRolled is the stronger of the two: yield strength 300 MPa (43.5 ksi) against 280 MPa (40.6 ksi) for 4J36 Annealed, about 7% more. In exchange, 4J36 Annealed is the more ductile: elongation 40% versus 35% for 4J36 HotRolled, and 4J36 HotRolled is harder (150 HB vs 135 HB).
4J36 AnnealedChoose it when the part is bent, formed or impact-loaded.
4J36 HotRolledChoose it when strength drives the design.
4J36 Annealed vs 4J36 HotRolled: 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)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 141 GPa20.5 Msi · Shear Modulus 55 GPa8 Msi · Bulk Modulus 110 GPa16 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 8.1 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,427°C2,601 °F · Liquidus Temperature 1,450°C2,642 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Same in both: Thermal Conductivity 10.5 W/m·K6.1 BTU/hr·ft·°F · Specific Heat Capacity 515 J/kg·K0.12 BTU/lb·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Max Service Temperature (continuous) 200°C392 °F · Min Service Temperature -253°C-423 °F
Electrical
Conductivity and insulation.
Electrical Resistivity
Same in both: Electrical Conductivity 2.2 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.4 V · Corrosion Resistance 25 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Machinability 30 / 100 · Weldability 75 / 100 · Castability 40 / 100 · Brazeability / Solderability 70 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 75 MJ/kg32,244 BTU/lb · Embodied Carbon (primary production) 5.5 kg CO₂/kg · Embodied Water 180 L/kg21.6 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.
4J36 Annealed vs 4J36 HotRolled — frequently asked
Is 4J36 HotRolled stronger than 4J36 Annealed?
Yes. 4J36 HotRolled has a typical yield strength of 300 MPa (43.5 ksi) against 280 MPa (40.6 ksi) for 4J36 Annealed — about 7% more. Tensile strength is 500 MPa (72.5 ksi) vs 490 MPa (71.1 ksi).
Which condition does FabDigit quote by default, Annealed or HotRolled?
Annealed is the default 4J36 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.
When should I choose 4J36 Annealed over 4J36 HotRolled?
Pick 4J36 Annealed when the part is bent, formed or impact-loaded. Pick 4J36 HotRolled when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4J36 Annealed and 4J36 HotRolled 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.