Stainless Steel 1.4150-A vs 1.4150-QT900
Stainless Steel · 1.4150 temper comparison
1.4150-A and 1.4150-QT900 are two conditions of the same stainless steel grade, 1.4150: A (solution annealed) versus QT900. The chemistry is identical, so every difference below comes from the condition. 1.4150-QT900 is the stronger of the two: yield strength 780 MPa (113 ksi) against 550 MPa (79.8 ksi) for 1.4150-A, about 42% more; tensile strength follows at 1,000 MPa (145 ksi) vs 850 MPa (123 ksi). In exchange, 1.4150-A is the more ductile: elongation 18% versus 15% for 1.4150-QT900, and 1.4150-QT900 is harder (300 HB vs 260 HB). 1.4150-QT900 runs hotter in service (700°C vs 500°C continuous). On the shop floor, 1.4150-A machines more easily (45 vs 35 out of 100).
1.4150-AChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
1.4150-QT900Choose it when strength drives the design, or when the part sees heat.
1.4150-A vs 1.4150-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
Fatigue Strength (Endurance Limit)
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 165 GPa23.9 Msi · Poisson's Ratio 0.29 · Reduction in Area 45% · Compressive Strength 1,250 MPa181 ksi · Shear Strength 720 MPa104 ksi · Fracture Toughness (K_IC) 30 MPa·√m27.3 ksi·√in
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 1,460°C2,660 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 22 W/m·K12.7 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 2.3 % IACS · Electrical Resistivity 7.5×10⁻⁷ Ω·m29.5 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 %)
Formability (cold)
Same in both: Weldability 20 / 100 · Brazeability / Solderability 45 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 53 MJ/kg22,786 BTU/lb · Embodied Carbon (primary production) 5.2 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 35%
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.
1.4150-A vs 1.4150-QT900 — frequently asked
Is 1.4150-QT900 stronger than 1.4150-A?
Yes. 1.4150-QT900 has a typical yield strength of 780 MPa (113 ksi) against 550 MPa (79.8 ksi) for 1.4150-A — about 42% more. Tensile strength is 1,000 MPa (145 ksi) vs 850 MPa (123 ksi).
Which condition does FabDigit quote by default, A or QT900?
QT1100 is the default 1.4150 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, 1.4150-A or 1.4150-QT900?
1.4150-A, by a small margin. Both rate fair for machinability — 45/100 against 35/100 for 1.4150-QT900.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4150-A and 1.4150-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.