Steel 826M40 Annealed vs 826M40 Nitrided
Steel · 826M40 temper comparison
826M40 Annealed and 826M40 Nitrided are two conditions of the same steel grade, 826M40: Annealed versus Nitrided. The chemistry is identical, so every difference below comes from the condition. 826M40 Nitrided is the stronger of the two: yield strength 810 MPa (117 ksi) against 480 MPa (69.6 ksi) for 826M40 Annealed, about 69% more; tensile strength follows at 1,000 MPa (145 ksi) vs 750 MPa (109 ksi). In exchange, 826M40 Annealed is the more ductile: elongation 22% versus 12% for 826M40 Nitrided, and 826M40 Nitrided is harder (277 HB vs 225 HB). On the shop floor, 826M40 Annealed machines more easily (good vs not recommended) and 826M40 Annealed welds better (poor vs not recommended).
826M40 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
826M40 NitridedChoose it when strength drives the design.
826M40 Annealed vs 826M40 Nitrided: 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.
826M40 Annealed826M40 Nitrided
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 208 GPa30.2 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) 1,420°C2,588 °F · Liquidus Temperature 1,490°C2,714 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 42 W/m·K24.3 BTU/hr·ft·°F · Specific Heat Capacity 470 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 -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.2 % IACS · Electrical Resistivity 2.4×10⁻⁷ Ω·m9.45 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 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: Castability 40 / 100 · Brazeability / Solderability 50 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 33 MJ/kg14,187 BTU/lb · Embodied Carbon (primary production) 2.5 kg CO₂/kg · Embodied Water 75 L/kg9 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.
826M40 Annealed vs 826M40 Nitrided — frequently asked
Is 826M40 Nitrided stronger than 826M40 Annealed?
Yes. 826M40 Nitrided has a typical yield strength of 810 MPa (117 ksi) against 480 MPa (69.6 ksi) for 826M40 Annealed — about 69% more. Tensile strength is 1,000 MPa (145 ksi) vs 750 MPa (109 ksi).
Which condition does FabDigit quote by default, Annealed or Nitrided?
T is the default 826M40 condition in the FabDigit quote flow (neither Annealed nor Nitrided). 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, 826M40 Annealed or 826M40 Nitrided?
826M40 Annealed. Its machinability rates good (55/100) against not recommended (10/100) for 826M40 Nitrided; for welding the order is 826M40 Annealed first (poor, 25/100) then 826M40 Nitrided (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 826M40 Annealed and 826M40 Nitrided 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.