Steel 4140 Annealed vs 4140 Normalized
Steel · 4140 temper comparison
4140 Annealed and 4140 Normalized are two conditions of the same steel grade, 4140: Annealed versus Normalized. The chemistry is identical, so every difference below comes from the condition. 4140 Normalized is the stronger of the two: yield strength 655 MPa (95 ksi) against 415 MPa (60.2 ksi) for 4140 Annealed, about 58% more; tensile strength follows at 1,020 MPa (148 ksi) vs 655 MPa (95 ksi). In exchange, 4140 Annealed is the more ductile: elongation 25.7% versus 17.7% for 4140 Normalized, and 4140 Normalized is harder (302 HB vs 197 HB). On the shop floor, 4140 Annealed machines more easily (good vs fair).
4140 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
4140 NormalizedChoose it when strength drives the design.
4140 Annealed vs 4140 Normalized: 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 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Compressive Strength 480 MPa69.6 ksi · Fracture Toughness (K_IC) 110 MPa·√m100 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,416°C2,581 °F · Liquidus Temperature 1,483°C2,701 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 42.6 W/m·K24.6 BTU/hr·ft·°F · Specific Heat Capacity 473 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 425°C797 °F · 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) -0.61 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)
Same in both: Brazeability / Solderability 55 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 32 MJ/kg13,758 BTU/lb · Embodied Carbon (primary production) 2.2 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.
4140 Annealed vs 4140 Normalized — frequently asked
Is 4140 Normalized stronger than 4140 Annealed?
Yes. 4140 Normalized has a typical yield strength of 655 MPa (95 ksi) against 415 MPa (60.2 ksi) for 4140 Annealed — about 58% more. Tensile strength is 1,020 MPa (148 ksi) vs 655 MPa (95 ksi).
Which condition does FabDigit quote by default, Annealed or Normalized?
HR is the default 4140 condition in the FabDigit quote flow (neither Annealed nor Normalized). 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, 4140 Annealed or 4140 Normalized?
4140 Annealed. Its machinability rates good (63/100) against fair (50/100) for 4140 Normalized; for welding the order is 4140 Annealed first (fair, 45/100) then 4140 Normalized (fair, 38/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4140 Annealed and 4140 Normalized 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.