Stainless Steel 1.4313 +A vs 1.4313 +QT780
Stainless Steel · 1.4313 temper comparison
1.4313 +A and 1.4313 +QT780 are two conditions of the same stainless steel grade, 1.4313: +A (annealed) versus +QT780 (quenched and tempered, Rm 780–980 MPa). The chemistry is identical, so every difference below comes from the condition. 1.4313 +QT780 is the stronger of the two: yield strength 700 MPa (102 ksi) against 550 MPa (79.8 ksi) for 1.4313 +A, about 27% more; tensile strength follows at 870 MPa (126 ksi) vs 750 MPa (109 ksi). 1.4313 +QT780 is harder — 265 HB against 250 HB for 1.4313 +A — which matters for wear surfaces and threads. On the shop floor, 1.4313 +A machines more easily (45 vs 35 out of 100) and 1.4313 +A forms better (45 vs 35 out of 100).
1.4313 +AChoose it when the part is machined in volume.
1.4313 +QT780Choose it when strength drives the design, or when surface hardness matters.
1.4313 +A vs 1.4313 +QT780: 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)
Reduction in Area
Fatigue Strength (Endurance Limit)
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 · Elongation at Break 18% · Compressive Strength 710 MPa103 ksi · Shear Strength 520 MPa75.4 ksi · Fracture Toughness (K_IC) 150 MPa·√m137 ksi·√in
Physical
Density and transition temperatures.
Same in both: Density 7.7 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,440°C2,624 °F · Liquidus Temperature 1,500°C2,732 °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 440 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) 400°C752 °F · Min Service Temperature -80°C-112 °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) -0.28 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 70 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 53 MJ/kg22,786 BTU/lb · Embodied Carbon (primary production) 4.8 kg CO₂/kg · Embodied Water 220 L/kg26.4 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.
1.4313 +A vs 1.4313 +QT780 — frequently asked
Is 1.4313 +QT780 stronger than 1.4313 +A?
Yes. 1.4313 +QT780 has a typical yield strength of 700 MPa (102 ksi) against 550 MPa (79.8 ksi) for 1.4313 +A — about 27% more. Tensile strength is 870 MPa (126 ksi) vs 750 MPa (109 ksi).
Which condition does FabDigit quote by default, +A or +QT780?
+QT780 is the default 1.4313 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, 1.4313 +A or 1.4313 +QT780?
1.4313 +A, by a small margin. Both rate fair for machinability — 45/100 against 35/100 for 1.4313 +QT780.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4313 +A and 1.4313 +QT780 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.