Steel 8740-HR vs 8740 Normalized
Steel · 8740 temper comparison
8740-HR and 8740 Normalized are two conditions of the same steel grade, 8740: HR (hot rolled) versus Normalized. The chemistry is identical, so every difference below comes from the condition. 8740 Normalized is the stronger of the two: yield strength 605 MPa (87.7 ksi) against 440 MPa (63.8 ksi) for 8740-HR, about 38% more; tensile strength follows at 930 MPa (135 ksi) vs 725 MPa (105 ksi). In exchange, 8740-HR is the more ductile: elongation 20% versus 16% for 8740 Normalized, and 8740 Normalized is harder (269 HB vs 210 HB).
8740-HRChoose it when the part is bent, formed or impact-loaded.
8740 NormalizedChoose it when strength drives the design.
8740-HR vs 8740 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
Fatigue Strength (Endurance Limit)
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 · Compressive Strength 440 MPa63.8 ksi · Shear Strength 450 MPa65.3 ksi · Fracture Toughness (K_IC) 110 MPa·√m100 ksi·√in · Hardness, Rockwell B 94 HRB · Hardness, Vickers 220 HV
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.
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 · Thermal Expansion (CTE, 20–100 °C) 12.6 µm/m·K7 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 400°C752 °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) -0.6 V · Corrosion Resistance 13 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Same in both: Weldability 42 / 100 · Formability (cold) 40 / 100 · Brazeability / Solderability 60 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 29 MJ/kg12,468 BTU/lb · Embodied Carbon (primary production) 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.
8740-HR vs 8740 Normalized — frequently asked
Is 8740 Normalized stronger than 8740-HR?
Yes. 8740 Normalized has a typical yield strength of 605 MPa (87.7 ksi) against 440 MPa (63.8 ksi) for 8740-HR — about 38% more. Tensile strength is 930 MPa (135 ksi) vs 725 MPa (105 ksi).
Which condition does FabDigit quote by default, HR or Normalized?
HR is the default 8740 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.
Which is easier to machine, 8740-HR or 8740 Normalized?
8740-HR. Its machinability rates good (55/100) against fair (48/100) for 8740 Normalized.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 8740-HR and 8740 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.