Steel 8CrMo16-5 +N vs 8CrMo16-5 +QT+NIT
Steel · 8CrMo16-5 temper comparison
8CrMo16-5 +N and 8CrMo16-5 +QT+NIT are two conditions of the same steel grade, 8CrMo16-5: +N (normalized) versus +QT+NIT (+QT + Nitrided). The chemistry is identical, so every difference below comes from the condition. 8CrMo16-5 +QT+NIT is the stronger of the two: yield strength 590 MPa (85.6 ksi) against 450 MPa (65.3 ksi) for 8CrMo16-5 +N, about 31% more; tensile strength follows at 800 MPa (116 ksi) vs 680 MPa (98.6 ksi). In exchange, 8CrMo16-5 +N is the more ductile: elongation 19% versus 14% for 8CrMo16-5 +QT+NIT, and 8CrMo16-5 +QT+NIT is harder (250 HB vs 215 HB). On the shop floor, 8CrMo16-5 +N machines more easily (good vs not recommended) and 8CrMo16-5 +N welds better (fair vs not recommended).
8CrMo16-5 +NChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
8CrMo16-5 +QT+NITChoose it when strength drives the design.
8CrMo16-5 +N vs 8CrMo16-5 +QT+NIT: 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 210 GPa30.5 Msi · Shear Modulus 81 GPa11.7 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 7.8 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,450°C2,642 °F · Liquidus Temperature 1,500°C2,732 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.5 µm/m·K6.4 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 5.8 % IACS · Electrical Resistivity 3×10⁻⁷ Ω·m11.8 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Polishability
Same in both: Brazeability / Solderability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 26 MJ/kg11,178 BTU/lb · Embodied Carbon (primary production) 2 kg CO₂/kg · Embodied Water 60 L/kg7.2 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.
8CrMo16-5 +N vs 8CrMo16-5 +QT+NIT — frequently asked
Is 8CrMo16-5 +QT+NIT stronger than 8CrMo16-5 +N?
Yes. 8CrMo16-5 +QT+NIT has a typical yield strength of 590 MPa (85.6 ksi) against 450 MPa (65.3 ksi) for 8CrMo16-5 +N — about 31% more. Tensile strength is 800 MPa (116 ksi) vs 680 MPa (98.6 ksi).
Which condition does FabDigit quote by default, +N or +QT+NIT?
+QT is the default 8CrMo16-5 condition in the FabDigit quote flow (neither +N nor +QT+NIT). 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, 8CrMo16-5 +N or 8CrMo16-5 +QT+NIT?
8CrMo16-5 +N. Its machinability rates good (60/100) against not recommended (8/100) for 8CrMo16-5 +QT+NIT; for welding the order is 8CrMo16-5 +N first (fair, 40/100) then 8CrMo16-5 +QT+NIT (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 8CrMo16-5 +N and 8CrMo16-5 +QT+NIT 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.