Stainless Steel Discaloy-HR vs Discaloy-STA
Stainless Steel · Discaloy temper comparison
Discaloy-HR and Discaloy-STA are two conditions of the same stainless steel grade, Discaloy: HR (hot rolled) versus STA (solution treated and aged). The chemistry is identical, so every difference below comes from the condition. Discaloy-STA is the stronger of the two: yield strength 730 MPa (106 ksi) against 450 MPa (65.3 ksi) for Discaloy-HR, about 62% more; tensile strength follows at 1,000 MPa (145 ksi) vs 800 MPa (116 ksi). In exchange, Discaloy-HR is the more ductile: elongation 30% versus 20% for Discaloy-STA, and Discaloy-STA is harder (290 HB vs 230 HB). On the shop floor, Discaloy-HR machines more easily (30 vs 18 out of 100) and Discaloy-HR welds better (good vs fair).
Discaloy-HRChoose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
Discaloy-STAChoose it when strength drives the design.
Discaloy-HR vs Discaloy-STA: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 196 GPa28.4 Msi · Shear Modulus 76 GPa11 Msi · Bulk Modulus 165 GPa23.9 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 7.97 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,380°C2,516 °F · Liquidus Temperature 1,430°C2,606 °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) 15.5 µm/m·K8.6 µin/in·°F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.9 % IACS · Electrical Resistivity 9.1×10⁻⁷ Ω·m35.8 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Corrosion Resistance 62 / 100
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: Castability 35 / 100 · Brazeability / Solderability 45 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 80 MJ/kg34,394 BTU/lb · Embodied Carbon (primary production) 5.5 kg CO₂/kg · Embodied Water 190 L/kg22.8 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.
Discaloy-HR vs Discaloy-STA — frequently asked
Is Discaloy-STA stronger than Discaloy-HR?
Yes. Discaloy-STA has a typical yield strength of 730 MPa (106 ksi) against 450 MPa (65.3 ksi) for Discaloy-HR — about 62% more. Tensile strength is 1,000 MPa (145 ksi) vs 800 MPa (116 ksi).
Which condition does FabDigit quote by default, HR or STA?
STA is the default Discaloy 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, Discaloy-HR or Discaloy-STA?
Discaloy-HR, by a small margin. Both rate poor for machinability — 30/100 against 18/100 for Discaloy-STA; for welding the order is Discaloy-HR first (good, 55/100) then Discaloy-STA (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in Discaloy-HR and Discaloy-STA 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.