Stainless Steel 1.4123 +A vs 1.4123 +QT58
Stainless Steel · 1.4123 temper comparison
1.4123 +A and 1.4123 +QT58 are two conditions of the same stainless steel grade, 1.4123: +A (annealed) versus +QT58 (+QT 58–60 HRC). The chemistry is identical, so every difference below comes from the condition. 1.4123 +QT58 is the stronger of the two: yield strength 1,850 MPa (268 ksi) against 600 MPa (87 ksi) for 1.4123 +A, about 3.1 times as much; tensile strength follows at 2,200 MPa (319 ksi) vs 880 MPa (128 ksi). In exchange, 1.4123 +A is the more ductile: elongation 14% versus 3% for 1.4123 +QT58, and 1.4123 +QT58 is harder (59 HRC vs 25 HRC). 1.4123 +A runs hotter in service (400°C vs 200°C continuous). On the shop floor, 1.4123 +A machines more easily (fair vs not recommended) and 1.4123 +A welds better (poor vs not recommended).
1.4123 +AChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
1.4123 +QT58Choose it when strength drives the design.
1.4123 +A vs 1.4123 +QT58: 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)
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 205 GPa29.7 Msi · Shear Modulus 80 GPa11.6 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.29 · Hardness, Brinell 255 HB
Physical
Density and transition temperatures.
Same in both: Density 7.68 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,470°C2,678 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 20 W/m·K11.6 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 270 J/g116 BTU/lb · Min Service Temperature -100°C-148 °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)
Polishability
Same in both: Castability 30 / 100 · Brazeability / Solderability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 60 MJ/kg25,795 BTU/lb · Embodied Carbon (primary production) 4.8 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 25%
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.
1.4123 +A vs 1.4123 +QT58 — frequently asked
Is 1.4123 +QT58 stronger than 1.4123 +A?
Yes. 1.4123 +QT58 has a typical yield strength of 1,850 MPa (268 ksi) against 600 MPa (87 ksi) for 1.4123 +A — about 3.1 times as much. Tensile strength is 2,200 MPa (319 ksi) vs 880 MPa (128 ksi).
Which condition does FabDigit quote by default, +A or +QT58?
+A is the default 1.4123 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, 1.4123 +A or 1.4123 +QT58?
1.4123 +A. Its machinability rates fair (35/100) against not recommended (8/100) for 1.4123 +QT58; for welding the order is 1.4123 +A first (poor, 20/100) then 1.4123 +QT58 (not recommended, 10/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4123 +A and 1.4123 +QT58 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.