Steel 718H Annealed vs 718H Prehard
Steel · 718H temper comparison
718H Annealed and 718H Prehard are two conditions of the same steel grade, 718H: Annealed versus Prehard (pre-hardened). The chemistry is identical, so every difference below comes from the condition. 718H Prehard is the stronger of the two: yield strength 900 MPa (131 ksi) against 480 MPa (69.6 ksi) for 718H Annealed, about 88% more; tensile strength follows at 1,080 MPa (157 ksi) vs 760 MPa (110 ksi). In exchange, 718H Annealed is the more ductile: elongation 20% versus 13% for 718H Prehard, and 718H Prehard is harder (300 HB vs 220 HB). On the shop floor, 718H Annealed machines more easily (good vs fair) and 718H Annealed welds better (good vs fair).
718H AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
718H PrehardChoose it when strength drives the design.
718H Annealed vs 718H Prehard: 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
Charpy V-Notch Impact (RT)
Hardness, Brinell
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 · Reduction in Area 45% · Shear Strength 650 MPa94.3 ksi · Fatigue Strength (Endurance Limit) 500 MPa72.5 ksi · Fracture Toughness (K_IC) 70 MPa·√m63.7 ksi·√in · Hardness, Rockwell C 32 HRC · Hardness, Vickers 320 HV
Physical
Density and transition temperatures.
Same in both: Density 7.8 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.
Same in both: Thermal Conductivity 33 W/m·K19.1 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.5 µm/m·K6.9 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Max Service Temperature (continuous) 450°C842 °F · Min Service Temperature -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 15 / 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 40 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 35%
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.
718H Annealed vs 718H Prehard — frequently asked
Is 718H Prehard stronger than 718H Annealed?
Yes. 718H Prehard has a typical yield strength of 900 MPa (131 ksi) against 480 MPa (69.6 ksi) for 718H Annealed — about 88% more. Tensile strength is 1,080 MPa (157 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, Annealed or Prehard?
Prehard is the default 718H 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, 718H Annealed or 718H Prehard?
718H Annealed. Its machinability rates good (62/100) against fair (48/100) for 718H Prehard; for welding the order is 718H Annealed first (good, 55/100) then 718H Prehard (fair, 40/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 718H Annealed and 718H Prehard 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.