Stainless Steel S42035-QT205 vs S42035-QT595
Stainless Steel · S42035 temper comparison
S42035-QT205 and S42035-QT595 are two conditions of the same stainless steel grade, S42035: QT205 (hardened ~1010 °C, oil/air quenched, tempered 205 °C) versus QT595 (hardened, tempered 595 °C). The chemistry is identical, so every difference below comes from the condition. S42035-QT205 is the stronger of the two: yield strength 1,450 MPa (210 ksi) against 830 MPa (120 ksi) for S42035-QT595, about 75% more; tensile strength follows at 1,720 MPa (249 ksi) vs 1,030 MPa (149 ksi). In exchange, S42035-QT595 is the more ductile: elongation 16% versus 8% for S42035-QT205, and S42035-QT595 is harder (311 HB vs 215 HB). S42035-QT595 runs hotter in service (500°C vs 200°C continuous). On the shop floor, S42035-QT595 machines more easily (33 vs 18 out of 100).
S42035-QT205Choose it when strength drives the design.
S42035-QT595Choose it when the part is bent, formed or impact-loaded, or when the part sees heat.
S42035-QT205 vs S42035-QT595: 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, Brinell
Hardness, Vickers
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 · Hardness, Rockwell B 96 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.7 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,454°C2,649 °F · Liquidus Temperature 1,510°C2,750 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 24.9 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) 10.3 µm/m·K5.7 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -30°C-22 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 3.1 % IACS · Electrical Resistivity 5.5×10⁻⁷ Ω·m21.7 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 %)
Weldability
Formability (cold)
Polishability
Same in both: Brazeability / Solderability 45 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 48 MJ/kg20,636 BTU/lb · Embodied Carbon (primary production) 3.4 kg CO₂/kg · Embodied Water 120 L/kg14.4 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.
S42035-QT205 vs S42035-QT595 — frequently asked
Is S42035-QT205 stronger than S42035-QT595?
Yes. S42035-QT205 has a typical yield strength of 1,450 MPa (210 ksi) against 830 MPa (120 ksi) for S42035-QT595 — about 75% more. Tensile strength is 1,720 MPa (249 ksi) vs 1,030 MPa (149 ksi).
Which condition does FabDigit quote by default, QT205 or QT595?
A is the default S42035 condition in the FabDigit quote flow (neither QT205 nor QT595). 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, S42035-QT205 or S42035-QT595?
S42035-QT595, by a small margin. Both rate poor for machinability — 33/100 against 18/100 for S42035-QT205; for welding the order is S42035-QT595 first (poor, 20/100) then S42035-QT205 (not recommended, 12/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in S42035-QT205 and S42035-QT595 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.