Stainless Steel 660 Age Hardened vs 660 Cold Drawn
Stainless Steel · 660 temper comparison
660 Age Hardened and 660 Cold Drawn are two conditions of the same stainless steel grade, 660: Age Hardened (solution 980 °C + age 720 °C/16 h) versus Cold Drawn. The chemistry is identical, so every difference below comes from the condition. 660 Age Hardened is the stronger of the two: tensile strength 1,000 MPa (145 ksi) against 900 MPa (131 ksi) for 660 Cold Drawn, about 11% more. 660 Age Hardened is the more ductile: elongation 20% versus 18% for 660 Cold Drawn, and 660 Age Hardened is harder (300 HB vs 240 HB). 660 Age Hardened runs hotter in service (700°C vs 480°C continuous).
660 Age HardenedChoose it when strength drives the design, or when the part is bent, formed or impact-loaded.
660 Age Hardened vs 660 Cold Drawn: 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.
660 Age Hardened660 Cold Drawn
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 B
Same in both: Elastic (Young's) Modulus 201 GPa29.2 Msi · Shear Modulus 77 GPa11.2 Msi · Bulk Modulus 176 GPa25.5 Msi · Poisson's Ratio 0.31
Physical
Density and transition temperatures.
Same in both: Density 7.94 g/cm³0.29 lb/in³ · Melting Point (Solidus) 1,370°C2,498 °F · Liquidus Temperature 1,400°C2,552 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 13.4 W/m·K7.7 BTU/hr·ft·°F · Specific Heat Capacity 460 J/kg·K0.11 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 16.6 µm/m·K9.2 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).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.1 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 50 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 95 MJ/kg40,843 BTU/lb · Embodied Carbon (primary production) 6.8 kg CO₂/kg · Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 30%
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.
660 Age Hardened vs 660 Cold Drawn — frequently asked
Is 660 Age Hardened stronger than 660 Cold Drawn?
Yes. 660 Age Hardened has a typical tensile strength of 1,000 MPa (145 ksi) against 900 MPa (131 ksi) for 660 Cold Drawn — about 11% more.
Which condition does FabDigit quote by default, Age Hardened or Cold Drawn?
Solution Annealed is the default 660 condition in the FabDigit quote flow (neither Age Hardened nor Cold Drawn). 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, 660 Age Hardened or 660 Cold Drawn?
660 Cold Drawn, by a small margin. Both rate poor for machinability — 25/100 against 20/100 for 660 Age Hardened; for welding the order is 660 Cold Drawn first (fair, 45/100) then 660 Age Hardened (fair, 40/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in 660 Age Hardened and 660 Cold Drawn 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.