Steel 817M40 Normalized vs 817M40-S
Steel · 817M40 temper comparison
817M40 Normalized and 817M40-S are two conditions of the same steel grade, 817M40: Normalized versus S (condition S). The chemistry is identical, so every difference below comes from the condition. 817M40 Normalized is the stronger of the two: yield strength 860 MPa (125 ksi) against 660 MPa (95.7 ksi) for 817M40-S, about 30% more; tensile strength follows at 1,280 MPa (186 ksi) vs 850 MPa (123 ksi). In exchange, 817M40-S is the more ductile: elongation 18% versus 12% for 817M40 Normalized, and 817M40 Normalized is harder (363 HB vs 250 HB). 817M40-S runs hotter in service (440°C vs 400°C continuous). On the shop floor, 817M40-S machines more easily (fair vs poor) and 817M40-S welds better (fair vs poor).
817M40 NormalizedChoose it when strength drives the design.
817M40-SChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
817M40 Normalized vs 817M40-S: 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
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
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
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,416°C2,581 °F · Liquidus Temperature 1,465°C2,669 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
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) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 250 J/g107 BTU/lb · Min Service Temperature -40°C-40 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7 % IACS · Electrical Resistivity 2.48×10⁻⁷ Ω·m9.76 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · 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 68 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 33 MJ/kg14,187 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.
817M40 Normalized vs 817M40-S — frequently asked
Is 817M40 Normalized stronger than 817M40-S?
Yes. 817M40 Normalized has a typical yield strength of 860 MPa (125 ksi) against 660 MPa (95.7 ksi) for 817M40-S — about 30% more. Tensile strength is 1,280 MPa (186 ksi) vs 850 MPa (123 ksi).
Which condition does FabDigit quote by default, Normalized or S?
T is the default 817M40 condition in the FabDigit quote flow (neither Normalized nor S). 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, 817M40 Normalized or 817M40-S?
817M40-S. Its machinability rates fair (50/100) against poor (32/100) for 817M40 Normalized; for welding the order is 817M40-S first (fair, 35/100) then 817M40 Normalized (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 817M40 Normalized and 817M40-S 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.