Stainless Steel S42035-HR vs S42035-QT315
Stainless Steel · S42035 temper comparison
S42035-HR and S42035-QT315 are two conditions of the same stainless steel grade, S42035: HR (hot rolled) versus QT315 (hardened, tempered 315 °C). The chemistry is identical, so every difference below comes from the condition. S42035-QT315 is the stronger of the two: yield strength 1,330 MPa (193 ksi) against 600 MPa (87 ksi) for S42035-HR, about 122% more; tensile strength follows at 1,570 MPa (228 ksi) vs 900 MPa (131 ksi). In exchange, S42035-HR is the more ductile: elongation 14% versus 10% for S42035-QT315, and S42035-HR is harder (280 HB vs 215 HB). S42035-HR runs hotter in service (500°C vs 290°C continuous). On the shop floor, S42035-HR machines more easily (33 vs 20 out of 100) and S42035-QT315 welds better (30 vs 18 out of 100).
S42035-HRChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
S42035-QT315Choose it when strength drives the design, or when it will be welded.
S42035-HR vs S42035-QT315: 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.
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) 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.
Electrical Conductivity
Electrical Resistivity
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)
Same in both: Brazeability / Solderability 45 / 100 · Polishability 70 / 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-HR vs S42035-QT315 — frequently asked
Is S42035-QT315 stronger than S42035-HR?
Yes. S42035-QT315 has a typical yield strength of 1,330 MPa (193 ksi) against 600 MPa (87 ksi) for S42035-HR — about 122% more. Tensile strength is 1,570 MPa (228 ksi) vs 900 MPa (131 ksi).
Which condition does FabDigit quote by default, HR or QT315?
A is the default S42035 condition in the FabDigit quote flow (neither HR nor QT315). 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-HR or S42035-QT315?
S42035-HR, by a small margin. Both rate poor for machinability — 33/100 against 20/100 for S42035-QT315; for welding the order is S42035-QT315 first (poor, 30/100) then S42035-HR (poor, 18/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in S42035-HR and S42035-QT315 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.