Steel 28NiCrMoV8-5 +N vs 28NiCrMoV8-5 +QT+Nitr
Steel · 28NiCrMoV8-5 temper comparison
28NiCrMoV8-5 +N and 28NiCrMoV8-5 +QT+Nitr are two conditions of the same steel grade, 28NiCrMoV8-5: +N (normalized) versus +QT+Nitr (+QT + gas nitrided). The chemistry is identical, so every difference below comes from the condition. 28NiCrMoV8-5 +QT+Nitr is the stronger of the two: yield strength 720 MPa (104 ksi) against 560 MPa (81.2 ksi) for 28NiCrMoV8-5 +N, about 29% more. 28NiCrMoV8-5 +QT+Nitr is harder — 60 HRC against 25 HRC for 28NiCrMoV8-5 +N — which matters for wear surfaces and threads. 28NiCrMoV8-5 +QT+Nitr runs hotter in service (450°C vs 350°C continuous). On the shop floor, 28NiCrMoV8-5 +N machines more easily (fair vs not recommended), 28NiCrMoV8-5 +N welds better (poor vs not recommended), and 28NiCrMoV8-5 +N forms better (poor vs not recommended).
28NiCrMoV8-5 +NChoose it when the part is machined in volume, or when it will be welded.
28NiCrMoV8-5 +QT+NitrChoose it when strength drives the design, or when surface hardness matters.
28NiCrMoV8-5 +N vs 28NiCrMoV8-5 +QT+Nitr: 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.
28NiCrMoV8-5 +N28NiCrMoV8-5 +QT+Nitr
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
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 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Elongation at Break 15%
Physical
Density and transition temperatures.
Same in both: Density 7.83 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.
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) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 7.5 % IACS · Electrical Resistivity 2.3×10⁻⁷ Ω·m9.06 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.6 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: Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 34 MJ/kg14,617 BTU/lb · Embodied Carbon (primary production) 2.4 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 25%
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.
28NiCrMoV8-5 +N vs 28NiCrMoV8-5 +QT+Nitr — frequently asked
Is 28NiCrMoV8-5 +QT+Nitr stronger than 28NiCrMoV8-5 +N?
Yes. 28NiCrMoV8-5 +QT+Nitr has a typical yield strength of 720 MPa (104 ksi) against 560 MPa (81.2 ksi) for 28NiCrMoV8-5 +N — about 29% more. Tensile strength is 880 MPa (128 ksi) vs 850 MPa (123 ksi).
Which condition does FabDigit quote by default, +N or +QT+Nitr?
+QT800 is the default 28NiCrMoV8-5 condition in the FabDigit quote flow (neither +N nor +QT+Nitr). 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, 28NiCrMoV8-5 +N or 28NiCrMoV8-5 +QT+Nitr?
28NiCrMoV8-5 +N. Its machinability rates fair (48/100) against not recommended (12/100) for 28NiCrMoV8-5 +QT+Nitr; for welding the order is 28NiCrMoV8-5 +N first (poor, 32/100) then 28NiCrMoV8-5 +QT+Nitr (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 28NiCrMoV8-5 +N and 28NiCrMoV8-5 +QT+Nitr 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.