Stainless Steel S31100 Annealed vs S31100 CW-HS
Stainless Steel · S31100 temper comparison
S31100 Annealed and S31100 CW-HS are two conditions of the same stainless steel grade, S31100: Annealed versus CW-HS (cold Worked, high strength). The chemistry is identical, so every difference below comes from the condition. S31100 CW-HS is the stronger of the two: yield strength 830 MPa (120 ksi) against 500 MPa (72.5 ksi) for S31100 Annealed, about 66% more; tensile strength follows at 1,000 MPa (145 ksi) vs 760 MPa (110 ksi). In exchange, S31100 Annealed is the more ductile: elongation 30% versus 13% for S31100 CW-HS, and S31100 CW-HS is harder (320 HB vs 240 HB). S31100 Annealed runs hotter in service (300°C vs 250°C continuous). On the shop floor, S31100 Annealed welds better (good vs fair).
S31100 AnnealedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
S31100 CW-HSChoose it when strength drives the design.
S31100 Annealed vs S31100 CW-HS: 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)
Fracture Toughness (K_IC)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell C
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 200 GPa29 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 160 GPa23.2 Msi · Poisson's Ratio 0.3 · Hardness, Rockwell B 99 HRB
Physical
Density and transition temperatures.
Same in both: Density 7.75 g/cm³0.28 lb/in³ · Melting Point (Solidus) 1,400°C2,552 °F · Liquidus Temperature 1,450°C2,642 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 15.5 W/m·K9 BTU/hr·ft·°F · Specific Heat Capacity 480 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 13 µm/m·K7.2 µin/in·°F · Min Service Temperature -50°C-58 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 2.2 % IACS · Electrical Resistivity 8×10⁻⁷ Ω·m31.5 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.15 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: Castability 50 / 100 · Brazeability / Solderability 40 / 100 · Polishability 72 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 53 MJ/kg22,786 BTU/lb · Embodied Carbon (primary production) 4.6 kg CO₂/kg · Embodied Water 180 L/kg21.6 gal/lb · Typical Recycled Content 65%
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.
S31100 Annealed vs S31100 CW-HS — frequently asked
Is S31100 CW-HS stronger than S31100 Annealed?
Yes. S31100 CW-HS has a typical yield strength of 830 MPa (120 ksi) against 500 MPa (72.5 ksi) for S31100 Annealed — about 66% more. Tensile strength is 1,000 MPa (145 ksi) vs 760 MPa (110 ksi).
Which condition does FabDigit quote by default, Annealed or CW-HS?
Annealed is the default S31100 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, S31100 Annealed or S31100 CW-HS?
S31100 Annealed, by a small margin. Both rate poor for machinability — 33/100 against 28/100 for S31100 CW-HS; for welding the order is S31100 Annealed first (good, 62/100) then S31100 CW-HS (fair, 50/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in S31100 Annealed and S31100 CW-HS 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.