Steel E4340 Annealed vs E4340-CR
Steel · E4340 temper comparison
E4340 Annealed and E4340-CR are two conditions of the same steel grade, E4340: Annealed versus CR (cold rolled). The chemistry is identical, so every difference below comes from the condition. E4340-CR is the stronger of the two: yield strength 600 MPa (87 ksi) against 470 MPa (68.2 ksi) for E4340 Annealed, about 28% more; tensile strength follows at 800 MPa (116 ksi) vs 745 MPa (108 ksi). In exchange, E4340 Annealed is the more ductile: elongation 22% versus 15% for E4340-CR, and E4340-CR is harder (235 HB vs 217 HB).
E4340 AnnealedChoose it when the part is bent, formed or impact-loaded.
E4340-CRChoose it when strength drives the design.
E4340 Annealed vs E4340-CR: 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)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
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
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,427°C2,601 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Same in both: Specific Heat Capacity 475 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) 400°C752 °F · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7 % IACS · Electrical Resistivity 2.48×10⁻⁷ Ω·m9.76 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 15 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Weldability 35 / 100 · Castability 30 / 100 · Brazeability / Solderability 50 / 100 · Polishability 70 / 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 40%
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.
E4340 Annealed vs E4340-CR — frequently asked
Is E4340-CR stronger than E4340 Annealed?
Yes. E4340-CR has a typical yield strength of 600 MPa (87 ksi) against 470 MPa (68.2 ksi) for E4340 Annealed — about 28% more. Tensile strength is 800 MPa (116 ksi) vs 745 MPa (108 ksi).
Which condition does FabDigit quote by default, Annealed or CR?
HR is the default E4340 condition in the FabDigit quote flow (neither Annealed nor CR). 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, E4340 Annealed or E4340-CR?
E4340 Annealed. Its machinability rates good (55/100) against fair (50/100) for E4340-CR.
Ready to make it?
Upload a CAD file and FabDigit prices the part in E4340 Annealed and E4340-CR 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.