Stainless Steel 660 Annealed vs 660 Solution Annealed
Stainless Steel · 660 temper comparison
660 Annealed and 660 Solution Annealed are two conditions of the same stainless steel grade, 660: Annealed versus Solution Annealed. The chemistry is identical, so every difference below comes from the condition. 660 Solution Annealed is the stronger of the two: yield strength 310 MPa (45 ksi) against 280 MPa (40.6 ksi) for 660 Annealed, about 11% more; tensile strength follows at 690 MPa (100 ksi) vs 640 MPa (92.8 ksi). In exchange, 660 Annealed is the more ductile: elongation 45% versus 40% for 660 Solution Annealed, and 660 Solution Annealed is harder (160 HB vs 150 HB).
660 AnnealedChoose it when the part is bent, formed or impact-loaded.
660 Solution AnnealedChoose it when strength drives the design.
660 Annealed vs 660 Solution Annealed: 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 Annealed660 Solution Annealed
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
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 · Shear Strength 450 MPa65.3 ksi · Fatigue Strength (Endurance Limit) 300 MPa43.5 ksi
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.
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 · Max Service Temperature (continuous) 540°C1,004 °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: Galvanic Potential (seawater, vs SCE) -0.1 V · 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: 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 Annealed vs 660 Solution Annealed — frequently asked
Is 660 Solution Annealed stronger than 660 Annealed?
Yes. 660 Solution Annealed has a typical yield strength of 310 MPa (45 ksi) against 280 MPa (40.6 ksi) for 660 Annealed — about 11% more. Tensile strength is 690 MPa (100 ksi) vs 640 MPa (92.8 ksi).
Which condition does FabDigit quote by default, Annealed or Solution Annealed?
Solution Annealed is the default 660 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 welds better, 660 Annealed or 660 Solution Annealed?
660 Annealed. Its weldability rates good (60/100) against good (55/100) for 660 Solution Annealed.
Ready to make it?
Upload a CAD file and FabDigit prices the part in 660 Annealed and 660 Solution Annealed 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.