Stainless Steel 1.4150-QT1100 vs 1.4150-QT900
Stainless Steel · 1.4150 temper comparison
1.4150-QT1100 and 1.4150-QT900 are two conditions of the same stainless steel grade, 1.4150: QT1100 versus QT900. The chemistry is identical, so every difference below comes from the condition. 1.4150-QT1100 is the stronger of the two: yield strength 950 MPa (138 ksi) against 780 MPa (113 ksi) for 1.4150-QT900, about 22% more; tensile strength follows at 1,200 MPa (174 ksi) vs 1,000 MPa (145 ksi). In exchange, 1.4150-QT900 is the more ductile: elongation 15% versus 12% for 1.4150-QT1100, and 1.4150-QT1100 is harder (360 HB vs 300 HB).
1.4150-QT1100Choose it when strength drives the design.
1.4150-QT900Choose it when the part is bent, formed or impact-loaded.
1.4150-QT1100 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
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 215 GPa31.2 Msi · Shear Modulus 83 GPa12 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.29 · 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 %)
Same in both: Weldability 20 / 100 · Formability (cold) 15 / 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-QT1100 vs 1.4150-QT900 — frequently asked
Is 1.4150-QT1100 stronger than 1.4150-QT900?
Yes. 1.4150-QT1100 has a typical yield strength of 950 MPa (138 ksi) against 780 MPa (113 ksi) for 1.4150-QT900 — about 22% more. Tensile strength is 1,200 MPa (174 ksi) vs 1,000 MPa (145 ksi).
Which condition does FabDigit quote by default, QT1100 or QT900?
QT1100 is the default 1.4150 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, 1.4150-QT1100 or 1.4150-QT900?
1.4150-QT900. Its machinability rates fair (35/100) against poor (30/100) for 1.4150-QT1100.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4150-QT1100 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.