Stainless Steel 1.4029 +A vs 1.4029 +QT (hardened, low temper)
Stainless Steel · 1.4029 temper comparison
1.4029 +A and 1.4029 +QT (hardened, low temper) are two conditions of the same stainless steel grade, 1.4029: +A (annealed) versus +QT (hardened, low temper) (hardened & low-temperature tempered). The chemistry is identical, so every difference below comes from the condition. 1.4029 +QT (hardened, low temper) is the stronger of the two: yield strength 1,350 MPa (196 ksi) against 450 MPa (65.3 ksi) for 1.4029 +A, about 3.0 times as much; tensile strength follows at 1,600 MPa (232 ksi) vs 740 MPa (107 ksi). In exchange, 1.4029 +A is the more ductile: elongation 15% versus 3% for 1.4029 +QT (hardened, low temper), and 1.4029 +QT (hardened, low temper) is harder (520 HV vs 225 HV). 1.4029 +A runs hotter in service (400°C vs 200°C continuous). On the shop floor, 1.4029 +A machines more easily (good vs poor).
1.4029 +AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
1.4029 +QT (hardened, low temper)Choose it when strength drives the design.
1.4029 +A vs 1.4029 +QT (hardened, low temper): 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.
1.4029 +A1.4029 +QT (hardened, low temper)
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Fatigue Strength (Endurance Limit)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 215 GPa31.2 Msi · Shear Modulus 82 GPa11.9 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Reduction in Area 40% · Compressive Strength 460 MPa66.7 ksi · Shear Strength 450 MPa65.3 ksi · Hardness, Brinell 215 HB · Hardness, Rockwell B 96 HRB
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 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 -20°C-4 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 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 %)
Same in both: Weldability 12 / 100 · Formability (cold) 25 / 100 · Brazeability / Solderability 40 / 100 · Polishability 35 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 40 MJ/kg17,197 BTU/lb · Embodied Carbon (primary production) 3.4 kg CO₂/kg · Embodied Water 120 L/kg14.4 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.
1.4029 +A vs 1.4029 +QT (hardened, low temper) — frequently asked
Is 1.4029 +QT (hardened, low temper) stronger than 1.4029 +A?
Yes. 1.4029 +QT (hardened, low temper) has a typical yield strength of 1,350 MPa (196 ksi) against 450 MPa (65.3 ksi) for 1.4029 +A — about 3.0 times as much. Tensile strength is 1,600 MPa (232 ksi) vs 740 MPa (107 ksi).
Which condition does FabDigit quote by default, +A or +QT (hardened, low temper)?
+A is the default 1.4029 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, 1.4029 +A or 1.4029 +QT (hardened, low temper)?
1.4029 +A. Its machinability rates good (65/100) against poor (15/100) for 1.4029 +QT (hardened, low temper).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4029 +A and 1.4029 +QT (hardened, low temper) 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.