Stainless Steel Discaloy-CD vs Discaloy ST-SA
Stainless Steel · Discaloy temper comparison
Discaloy-CD and Discaloy ST-SA are two conditions of the same stainless steel grade, Discaloy: CD (cold drawn) versus ST-SA (ST + single age). The chemistry is identical, so every difference below comes from the condition. Discaloy-CD is the stronger of the two: yield strength 950 MPa (138 ksi) against 660 MPa (95.7 ksi) for Discaloy ST-SA, about 44% more; tensile strength follows at 1,150 MPa (167 ksi) vs 940 MPa (136 ksi). In exchange, Discaloy ST-SA is the more ductile: elongation 23% versus 12% for Discaloy-CD, and Discaloy-CD is harder (330 HB vs 270 HB). Discaloy ST-SA runs hotter in service (650°C vs 540°C continuous). On the shop floor, Discaloy ST-SA welds better (fair vs poor).
Discaloy-CDChoose it when strength drives the design.
Discaloy ST-SAChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Discaloy-CD vs Discaloy ST-SA: 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.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 14 W/m·K8.1 BTU/hr·ft·°F · 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.
Electrical Resistivity
Same in both: Electrical Conductivity 1.9 % IACS
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
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-CD vs Discaloy ST-SA — frequently asked
Is Discaloy-CD stronger than Discaloy ST-SA?
Yes. Discaloy-CD has a typical yield strength of 950 MPa (138 ksi) against 660 MPa (95.7 ksi) for Discaloy ST-SA — about 44% more. Tensile strength is 1,150 MPa (167 ksi) vs 940 MPa (136 ksi).
Which condition does FabDigit quote by default, CD or ST-SA?
STA is the default Discaloy condition in the FabDigit quote flow (neither CD nor ST-SA). 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 welds better, Discaloy-CD or Discaloy ST-SA?
Discaloy ST-SA. Its weldability rates fair (42/100) against poor (30/100) for Discaloy-CD.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Discaloy-CD and Discaloy ST-SA 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.