Stainless Steel 1.4405-AC vs 1.4405 QT760-DT
Stainless Steel · 1.4405 temper comparison
1.4405-AC and 1.4405 QT760-DT are two conditions of the same stainless steel grade, 1.4405: AC (spheroidize annealed) versus QT760-DT (+QT760 double tempered). The chemistry is identical, so every difference below comes from the condition. 1.4405-AC is the stronger of the two: yield strength 750 MPa (109 ksi) against 600 MPa (87 ksi) for 1.4405 QT760-DT, about 25% more; tensile strength follows at 1,000 MPa (145 ksi) vs 820 MPa (119 ksi). In exchange, 1.4405 QT760-DT is the more ductile: elongation 20% versus 6% for 1.4405-AC, and 1.4405-AC is harder (370 HB vs 270 HB). 1.4405 QT760-DT runs hotter in service (400°C vs 250°C continuous). On the shop floor, 1.4405 QT760-DT machines more easily (fair vs poor) and 1.4405 QT760-DT welds better (good vs fair).
1.4405-ACChoose it when strength drives the design.
1.4405 QT760-DTChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
1.4405-AC vs 1.4405 QT760-DT: 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 C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 160 GPa23.2 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) 1,400°C2,552 °F · Liquidus Temperature 1,455°C2,651 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Min Service Temperature
Same in both: 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 270 J/g116 BTU/lb
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 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: Castability 65 / 100 · Brazeability / Solderability 30 / 100 · Polishability 60 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 53 MJ/kg22,786 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 110 L/kg13.2 gal/lb · Typical Recycled Content 70%
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.
1.4405-AC vs 1.4405 QT760-DT — frequently asked
Is 1.4405-AC stronger than 1.4405 QT760-DT?
Yes. 1.4405-AC has a typical yield strength of 750 MPa (109 ksi) against 600 MPa (87 ksi) for 1.4405 QT760-DT — about 25% more. Tensile strength is 1,000 MPa (145 ksi) vs 820 MPa (119 ksi).
Which condition does FabDigit quote by default, AC or QT760-DT?
QT760 is the default 1.4405 condition in the FabDigit quote flow (neither AC nor QT760-DT). 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, 1.4405-AC or 1.4405 QT760-DT?
1.4405 QT760-DT. Its machinability rates fair (37/100) against poor (20/100) for 1.4405-AC; for welding the order is 1.4405 QT760-DT first (good, 62/100) then 1.4405-AC (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4405-AC and 1.4405 QT760-DT 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.