Stainless Steel 1.4317-QT900 vs 1.4317-SR
Stainless Steel · 1.4317 temper comparison
1.4317-QT900 and 1.4317-SR are two conditions of the same stainless steel grade, 1.4317: QT900 versus SR (stress relieved). The chemistry is identical, so every difference below comes from the condition. 1.4317-QT900 is the stronger of the two: yield strength 730 MPa (106 ksi) against 600 MPa (87 ksi) for 1.4317-SR, about 22% more; tensile strength follows at 930 MPa (135 ksi) vs 810 MPa (117 ksi). In exchange, 1.4317-SR is the more ductile: elongation 18% versus 15% for 1.4317-QT900, and 1.4317-QT900 is harder (300 HB vs 250 HB). On the shop floor, 1.4317-SR welds better (very good vs good).
1.4317-QT900Choose it when strength drives the design.
1.4317-SRChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
1.4317-QT900 vs 1.4317-SR: 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)
Fracture Toughness (K_IC)
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
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 1,480°C2,696 °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 270 J/g116 BTU/lb · Max Service Temperature (continuous) 450°C842 °F · Min Service Temperature -100°C-148 °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).
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 V · Corrosion Resistance 52 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Machinability Rating (AISI 1212 = 100 %)
Weldability
Same in both: Formability (cold) 15 / 100 · Castability 70 / 100 · Brazeability / Solderability 40 / 100 · Polishability 65 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 50 MJ/kg21,496 BTU/lb · Embodied Carbon (primary production) 3.6 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 70%
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.
1.4317-QT900 vs 1.4317-SR — frequently asked
Is 1.4317-QT900 stronger than 1.4317-SR?
Yes. 1.4317-QT900 has a typical yield strength of 730 MPa (106 ksi) against 600 MPa (87 ksi) for 1.4317-SR — about 22% more. Tensile strength is 930 MPa (135 ksi) vs 810 MPa (117 ksi).
Which condition does FabDigit quote by default, QT900 or SR?
QT780 is the default 1.4317 condition in the FabDigit quote flow (neither QT900 nor SR). 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, 1.4317-QT900 or 1.4317-SR?
1.4317-SR. Its machinability rates fair (42/100) against poor (33/100) for 1.4317-QT900; for welding the order is 1.4317-SR first (very good, 70/100) then 1.4317-QT900 (good, 60/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 1.4317-QT900 and 1.4317-SR 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.