Steel 18MnMoNi5-5-N vs 18MnMoNi5-5-QT
Steel · 18MnMoNi5-5 temper comparison
18MnMoNi5-5-N and 18MnMoNi5-5-QT are two conditions of the same steel grade, 18MnMoNi5-5: N (normalized) versus QT (quenched and tempered). The chemistry is identical, so every difference below comes from the condition. 18MnMoNi5-5-QT is the stronger of the two: yield strength 470 MPa (68.2 ksi) against 430 MPa (62.4 ksi) for 18MnMoNi5-5-N, about 9% more.
18MnMoNi5-5-QTChoose it when strength drives the design.
18MnMoNi5-5-N vs 18MnMoNi5-5-QT: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
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
Physical
Density and transition temperatures.
Same in both: Density 7.85 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,460°C2,660 °F · Liquidus Temperature 1,510°C2,750 °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 µm/m·K6.7 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 Resistivity 2.2×10⁻⁷ Ω·m8.66 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.61 V · Corrosion Resistance 13 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Formability (cold)
Same in both: Machinability 55 / 100 · Machinability Rating (AISI 1212 = 100 %) 58% · Weldability 65 / 100 · Brazeability / Solderability 40 / 100 · Polishability 55 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 30 MJ/kg12,898 BTU/lb · Embodied Carbon (primary production) 2.3 kg CO₂/kg · Embodied Water 60 L/kg7.2 gal/lb · Typical Recycled Content 20%
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.
18MnMoNi5-5-N vs 18MnMoNi5-5-QT — frequently asked
Is 18MnMoNi5-5-QT stronger than 18MnMoNi5-5-N?
Yes. 18MnMoNi5-5-QT has a typical yield strength of 470 MPa (68.2 ksi) against 430 MPa (62.4 ksi) for 18MnMoNi5-5-N — about 9% more. Tensile strength is 620 MPa (89.9 ksi) vs 640 MPa (92.8 ksi).
Which condition does FabDigit quote by default, N or QT?
QT is the default 18MnMoNi5-5 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 18MnMoNi5-5-N over 18MnMoNi5-5-QT?
Pick 18MnMoNi5-5-QT when strength drives the design.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 18MnMoNi5-5-N and 18MnMoNi5-5-QT 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.