Cobalt-Chrome Alloy L605 Cold Worked vs L605 Stress Relieved
Cobalt-Chrome Alloy · L605 temper comparison
L605 Cold Worked and L605 Stress Relieved are two conditions of the same cobalt-chrome alloy grade, L605: Cold Worked versus Stress Relieved. The chemistry is identical, so every difference below comes from the condition. L605 Cold Worked is the stronger of the two: yield strength 1,250 MPa (181 ksi) against 570 MPa (82.7 ksi) for L605 Stress Relieved, about 119% more; tensile strength follows at 1,520 MPa (220 ksi) vs 1,030 MPa (149 ksi). In exchange, L605 Stress Relieved is the more ductile: elongation 32% versus 10% for L605 Cold Worked, and L605 Stress Relieved is harder (275 HB vs 240 HB). L605 Stress Relieved runs hotter in service (950°C vs 540°C continuous).
L605 Cold WorkedChoose it when strength drives the design.
L605 Stress RelievedChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
L605 Cold Worked vs L605 Stress Relieved: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all cobalt-chrome alloy 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 cobalt-chrome alloy 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.
L605 Cold WorkedL605 Stress Relieved
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
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 225 GPa32.6 Msi · Shear Modulus 87 GPa12.6 Msi · Bulk Modulus 178 GPa25.8 Msi · Poisson's Ratio 0.29
Physical
Density and transition temperatures.
Same in both: Density 9.13 g/cm³0.33 lb/in³ · Melting Point (Solidus) 1,329°C2,424 °F · Liquidus Temperature 1,410°C2,570 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 9.4 W/m·K5.4 BTU/hr·ft·°F · Specific Heat Capacity 385 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 12.3 µm/m·K6.8 µin/in·°F · Latent Heat of Fusion 270 J/g116 BTU/lb · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.9 % IACS · Electrical Resistivity 8.9×10⁻⁷ Ω·m35 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: Galvanic Potential (seawater, vs SCE) -0.25 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 55 / 100 · Brazeability / Solderability 70 / 100 · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 250 MJ/kg107,481 BTU/lb · Embodied Carbon (primary production) 19 kg CO₂/kg · Embodied Water 500 L/kg59.9 gal/lb · Typical Recycled Content 30%
Strength versus weight
Yield strength against density for every cobalt-chrome alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
L605 Cold Worked vs L605 Stress Relieved — frequently asked
Is L605 Cold Worked stronger than L605 Stress Relieved?
Yes. L605 Cold Worked has a typical yield strength of 1,250 MPa (181 ksi) against 570 MPa (82.7 ksi) for L605 Stress Relieved — about 119% more. Tensile strength is 1,520 MPa (220 ksi) vs 1,030 MPa (149 ksi).
Which condition does FabDigit quote by default, Cold Worked or Stress Relieved?
Solution Annealed is the default L605 condition in the FabDigit quote flow (neither Cold Worked nor Stress Relieved). 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, L605 Cold Worked or L605 Stress Relieved?
L605 Stress Relieved. Its weldability rates good (65/100) against good (60/100) for L605 Cold Worked.
Ready to make it?
Upload a CAD file and FabDigit prices the part in L605 Cold Worked and L605 Stress Relieved 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.