Stainless Steel 1.4057 +A vs 1.4057 +QT900
Stainless Steel · 1.4057 temper comparison
1.4057 +A and 1.4057 +QT900 are two conditions of the same stainless steel grade, 1.4057: +A (annealed) versus +QT900 (quenched and tempered, Rm 900–1050 MPa). The chemistry is identical, so every difference below comes from the condition. 1.4057 +QT900 is the stronger of the two: yield strength 780 MPa (113 ksi) against 600 MPa (87 ksi) for 1.4057 +A, about 30% more; tensile strength follows at 970 MPa (141 ksi) vs 800 MPa (116 ksi). In exchange, 1.4057 +A is the more ductile: elongation 20% versus 15% for 1.4057 +QT900, and 1.4057 +QT900 is harder (300 HB vs 255 HB).
1.4057 +AChoose it when the part is bent, formed or impact-loaded.
1.4057 +QT900Choose it when strength drives the design.
1.4057 +A vs 1.4057 +QT900: 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
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 215 GPa31.2 Msi · Shear Modulus 83 GPa12 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3 · Compressive Strength 690 MPa100 ksi
Physical
Density and transition temperatures.
Same in both: Density 7.7 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,425°C2,597 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Same in both: Thermal Conductivity 25 W/m·K14.4 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 · Max Service Temperature (continuous) 500°C932 °F · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.5 % IACS · Electrical Resistivity 7×10⁻⁷ Ω·m27.6 µΩ·in
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: Brazeability / Solderability 40 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 55 MJ/kg23,646 BTU/lb · Embodied Carbon (primary production) 3.8 kg CO₂/kg · Embodied Water 130 L/kg15.6 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.
1.4057 +A vs 1.4057 +QT900 — frequently asked
Is 1.4057 +QT900 stronger than 1.4057 +A?
Yes. 1.4057 +QT900 has a typical yield strength of 780 MPa (113 ksi) against 600 MPa (87 ksi) for 1.4057 +A — about 30% more. Tensile strength is 970 MPa (141 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, +A or +QT900?
+QT800 is the default 1.4057 condition in the FabDigit quote flow (neither +A nor +QT900). 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, 1.4057 +A or 1.4057 +QT900?
1.4057 +A. Its machinability rates fair (42/100) against poor (33/100) for 1.4057 +QT900; for welding the order is 1.4057 +A first (fair, 35/100) then 1.4057 +QT900 (poor, 28/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4057 +A and 1.4057 +QT900 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.