Steel 8740 Annealed vs 8740-CD
Steel · 8740 temper comparison
8740 Annealed and 8740-CD are two conditions of the same steel grade, 8740: Annealed versus CD (cold drawn). The chemistry is identical, so every difference below comes from the condition. 8740-CD is the stronger of the two: yield strength 635 MPa (92.1 ksi) against 415 MPa (60.2 ksi) for 8740 Annealed, about 53% more; tensile strength follows at 745 MPa (108 ksi) vs 696 MPa (101 ksi). In exchange, 8740 Annealed is the more ductile: elongation 22% versus 15% for 8740-CD, and 8740-CD is harder (217 HB vs 201 HB).
8740 AnnealedChoose it when the part is bent, formed or impact-loaded.
8740-CDChoose it when strength drives the design.
8740 Annealed vs 8740-CD: 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, 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 · Compressive Strength 440 MPa63.8 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) 1,425°C2,597 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Expansion (CTE, 20–100 °C)
Min Service Temperature
Same in both: Thermal Conductivity 44 W/m·K25.4 BTU/hr·ft·°F · Specific Heat Capacity 475 J/kg·K0.11 BTU/lb·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V
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 60 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Same in both: 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.
8740 Annealed vs 8740-CD — frequently asked
Is 8740-CD stronger than 8740 Annealed?
Yes. 8740-CD has a typical yield strength of 635 MPa (92.1 ksi) against 415 MPa (60.2 ksi) for 8740 Annealed — about 53% more. Tensile strength is 745 MPa (108 ksi) vs 696 MPa (101 ksi).
Which condition does FabDigit quote by default, Annealed or CD?
HR is the default 8740 condition in the FabDigit quote flow (neither Annealed nor CD). 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, 8740 Annealed or 8740-CD?
8740 Annealed. Its machinability rates good (58/100) against fair (52/100) for 8740-CD.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 8740 Annealed and 8740-CD 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.