Steel S5 Annealed vs S5 Hardened & Tempered
Steel · S5 temper comparison
S5 Annealed and S5 Hardened & Tempered are two conditions of the same steel grade, S5: Annealed versus Hardened & Tempered (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. S5 Hardened & Tempered is the stronger of the two: yield strength 1,850 MPa (268 ksi) against 440 MPa (63.8 ksi) for S5 Annealed, about 4.2 times as much; tensile strength follows at 2,150 MPa (312 ksi) vs 725 MPa (105 ksi). In exchange, S5 Annealed is the more ductile: elongation 25% versus 4% for S5 Hardened & Tempered, and S5 Hardened & Tempered is harder (680 HV vs 225 HV). S5 Annealed runs hotter in service (400°C vs 175°C continuous).
S5 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
S5 Hardened & TemperedChoose it when strength drives the design.
S5 Annealed vs S5 Hardened & Tempered: 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.
S5 AnnealedS5 Hardened & Tempered
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)
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 207 GPa30 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Brinell 215 HB · Hardness, Rockwell B 95 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.76 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 24 W/m·K13.9 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.4 µm/m·K6.9 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 4 % IACS · Electrical Resistivity 4.5×10⁻⁷ Ω·m17.7 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 V · Corrosion Resistance 12 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Same in both: Machinability 50 / 100 · Weldability 25 / 100 · Formability (cold) 30 / 100 · Castability 30 / 100 · Brazeability / Solderability 35 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 36 MJ/kg15,477 BTU/lb · Embodied Carbon (primary production) 2.6 kg CO₂/kg · Embodied Water 65 L/kg7.8 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.
S5 Annealed vs S5 Hardened & Tempered — frequently asked
Is S5 Hardened & Tempered stronger than S5 Annealed?
Yes. S5 Hardened & Tempered has a typical yield strength of 1,850 MPa (268 ksi) against 440 MPa (63.8 ksi) for S5 Annealed — about 4.2 times as much. Tensile strength is 2,150 MPa (312 ksi) vs 725 MPa (105 ksi).
Which condition does FabDigit quote by default, Annealed or Hardened & Tempered?
Annealed is the default S5 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.
When should I choose S5 Annealed over S5 Hardened & Tempered?
Pick S5 Annealed when the part is bent, formed or impact-loaded, or when the part sees heat. Pick S5 Hardened & Tempered when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in S5 Annealed and S5 Hardened & Tempered 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.