Steel 4350 Annealed vs 4350-CR
Steel · 4350 temper comparison
4350 Annealed and 4350-CR are two conditions of the same steel grade, 4350: Annealed versus CR (cold rolled). The chemistry is identical, so every difference below comes from the condition. 4350-CR is the stronger of the two: yield strength 930 MPa (135 ksi) against 520 MPa (75.4 ksi) for 4350 Annealed, about 79% more; tensile strength follows at 1,080 MPa (157 ksi) vs 800 MPa (116 ksi). In exchange, 4350 Annealed is the more ductile: elongation 18% versus 8% for 4350-CR, and 4350-CR is harder (320 HB vs 235 HB). 4350 Annealed runs hotter in service (400°C vs 350°C continuous).
4350 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
4350-CRChoose it when strength drives the design.
4350 Annealed vs 4350-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
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
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) 1,420°C2,588 °F · Liquidus Temperature 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 42 W/m·K24.3 BTU/hr·ft·°F · 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 270 J/g116 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 2.5×10⁻⁷ Ω·m9.84 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: 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 45 / 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) 2.2 kg CO₂/kg · Embodied Water 45 L/kg5.4 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.
4350 Annealed vs 4350-CR — frequently asked
Is 4350-CR stronger than 4350 Annealed?
Yes. 4350-CR has a typical yield strength of 930 MPa (135 ksi) against 520 MPa (75.4 ksi) for 4350 Annealed — about 79% more. Tensile strength is 1,080 MPa (157 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, Annealed or CR?
HR is the default 4350 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.
When should I choose 4350 Annealed over 4350-CR?
Pick 4350 Annealed when the part is bent, formed or impact-loaded, or when the part sees heat. Pick 4350-CR when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 4350 Annealed and 4350-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.