Stainless Steel ER410-QT vs ER410-SR650
Stainless Steel · ER410 temper comparison
ER410-QT and ER410-SR650 are two conditions of the same stainless steel grade, ER410: QT (quenched and tempered) versus SR650 (SR 650 °C). The chemistry is identical, so every difference below comes from the condition. ER410-QT is the stronger of the two: yield strength 650 MPa (94.3 ksi) against 540 MPa (78.3 ksi) for ER410-SR650, about 20% more; tensile strength follows at 830 MPa (120 ksi) vs 700 MPa (102 ksi). ER410-SR650 is harder — 30 HRC against 28 HRC for ER410-QT — which matters for wear surfaces and threads.
ER410-QTChoose it when strength drives the design.
ER410-SR650Choose it when surface hardness matters.
ER410-QT vs ER410-SR650: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Rockwell C
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 78 GPa11.3 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.28 · Reduction in Area 50% · Hardness, Vickers 300 HV
Physical
Density and transition temperatures.
Same in both: Density 7.7 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,480°C2,696 °F · Liquidus Temperature 1,530°C2,786 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Max Service Temperature (continuous)
Same in both: Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 9.9 µm/m·K5.5 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 3 % IACS · Electrical Resistivity 5.7×10⁻⁷ Ω·m22.4 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 45 / 100 · Formability (cold) 28 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 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 150 L/kg18 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.
ER410-QT vs ER410-SR650 — frequently asked
Is ER410-QT stronger than ER410-SR650?
Yes. ER410-QT has a typical yield strength of 650 MPa (94.3 ksi) against 540 MPa (78.3 ksi) for ER410-SR650 — about 20% more. Tensile strength is 830 MPa (120 ksi) vs 700 MPa (102 ksi).
Which condition does FabDigit quote by default, QT or SR650?
AW is the default ER410 condition in the FabDigit quote flow (neither QT nor SR650). 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.
When should I choose ER410-QT over ER410-SR650?
Pick ER410-QT when strength drives the design. Pick ER410-SR650 when surface hardness matters.
Ready to make it?
Upload a CAD file and FabDigit prices the part in ER410-QT and ER410-SR650 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.