Stainless Steel 1.4024 +A vs 1.4024 +QT650
Stainless Steel · 1.4024 temper comparison
1.4024 +A and 1.4024 +QT650 are two conditions of the same stainless steel grade, 1.4024: +A (annealed) versus +QT650 (quenched and tempered to 650 MPa minimum tensile class). The chemistry is identical, so every difference below comes from the condition. 1.4024 +QT650 is the stronger of the two: yield strength 500 MPa (72.5 ksi) against 300 MPa (43.5 ksi) for 1.4024 +A, about 67% more; tensile strength follows at 720 MPa (104 ksi) vs 530 MPa (76.9 ksi). In exchange, 1.4024 +A is the more ductile: elongation 25% versus 17% for 1.4024 +QT650, and 1.4024 +QT650 is harder (220 HB vs 175 HB). 1.4024 +A runs hotter in service (550°C vs 480°C continuous). On the shop floor, 1.4024 +A welds better (fair vs poor).
1.4024 +AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
1.4024 +QT650Choose it when strength drives the design.
1.4024 +A vs 1.4024 +QT650: 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.
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 B
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 215 GPa31.2 Msi · Shear Modulus 83 GPa12 Msi · Bulk Modulus 166 GPa24.1 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 7.7 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,450°C2,642 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 30 W/m·K17.3 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 10.5 µm/m·K5.8 µin/in·°F · Latent Heat of Fusion 260 J/g112 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.9 % IACS · Electrical Resistivity 6×10⁻⁷ Ω·m23.6 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
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Same in both: Brazeability / Solderability 45 / 100 · Polishability 72 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 42 MJ/kg18,057 BTU/lb · Embodied Carbon (primary production) 3 kg CO₂/kg · Embodied Water 100 L/kg12 gal/lb · Typical Recycled Content 65%
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.
1.4024 +A vs 1.4024 +QT650 — frequently asked
Is 1.4024 +QT650 stronger than 1.4024 +A?
Yes. 1.4024 +QT650 has a typical yield strength of 500 MPa (72.5 ksi) against 300 MPa (43.5 ksi) for 1.4024 +A — about 67% more. Tensile strength is 720 MPa (104 ksi) vs 530 MPa (76.9 ksi).
Which condition does FabDigit quote by default, +A or +QT650?
+A is the default 1.4024 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.
Which is easier to machine, 1.4024 +A or 1.4024 +QT650?
1.4024 +A. Its machinability rates good (55/100) against fair (46/100) for 1.4024 +QT650; for welding the order is 1.4024 +A first (fair, 40/100) then 1.4024 +QT650 (poor, 30/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4024 +A and 1.4024 +QT650 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.