Stainless Steel 1.4418 +A vs 1.4418 +QT NACE
Stainless Steel · 1.4418 temper comparison
1.4418 +A and 1.4418 +QT NACE are two conditions of the same stainless steel grade, 1.4418: +A (annealed) versus +QT NACE (+QT). The chemistry is identical, so every difference below comes from the condition. Both yield at about 600 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (annealed versus +QT). 1.4418 +A is harder — 260 HB against 235 HB for 1.4418 +QT NACE — which matters for wear surfaces and threads. 1.4418 +A runs hotter in service (350°C vs 300°C continuous). On the shop floor, 1.4418 +A forms better (fair vs poor).
1.4418 +AChoose it when surface hardness matters, or when the part sees heat.
1.4418 +A vs 1.4418 +QT NACE: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all stainless 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 stainless 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.
Elongation at Break
Reduction in Area
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 166 GPa24.1 Msi · Poisson's Ratio 0.3 · Tensile Strength (Ultimate) 800 MPa116 ksi · Yield Strength (0.2% offset) 600 MPa87 ksi · Compressive Strength 790 MPa115 ksi · Shear Strength 590 MPa85.6 ksi · Fatigue Strength (Endurance Limit) 350 MPa50.8 ksi · Fracture Toughness (K_IC) 120 MPa·√m109 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.7 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,480°C2,696 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 15 W/m·K8.7 BTU/hr·ft·°F · Specific Heat Capacity 430 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.5 µm/m·K5.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -60°C-76 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.2 % IACS · Electrical Resistivity 8×10⁻⁷ Ω·m31.5 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 V
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Machinability 42 / 100 · Castability 60 / 100 · Brazeability / Solderability 40 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 5.5 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 60%
Strength versus weight
Yield strength against density for every stainless steel grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
1.4418 +A vs 1.4418 +QT NACE — frequently asked
What is the difference between 1.4418 +A and 1.4418 +QT NACE?
1.4418 +A and 1.4418 +QT NACE are two conditions of the same stainless steel grade, 1.4418: +A (annealed) versus +QT NACE (+QT). The chemistry is identical, so every difference below comes from the condition. Both yield at about 600 MPa — the mechanical properties are the same, and the difference is in how the stock is processed and what it is certified to (annealed versus +QT).
Which condition does FabDigit quote by default, +A or +QT NACE?
+QT900 is the default 1.4418 condition in the FabDigit quote flow (neither +A nor +QT NACE). 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 1.4418 +A over 1.4418 +QT NACE?
Pick 1.4418 +A when surface hardness matters, or when the part sees heat.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4418 +A and 1.4418 +QT NACE 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.