Cobalt-Chrome Alloy Haynes 188-AW vs Haynes 188-CW
Cobalt-Chrome Alloy · Haynes 188 temper comparison
Haynes 188-AW and Haynes 188-CW are two conditions of the same cobalt-chrome alloy grade, Haynes 188: AW (as-welded deposit) versus CW (cold worked). The chemistry is identical, so every difference below comes from the condition. Haynes 188-CW is the stronger of the two: yield strength 1,250 MPa (181 ksi) against 490 MPa (71.1 ksi) for Haynes 188-AW, about 155% more; tensile strength follows at 1,450 MPa (210 ksi) vs 840 MPa (122 ksi). In exchange, Haynes 188-AW is the more ductile: elongation 32% versus 4% for Haynes 188-CW, and Haynes 188-CW is harder (390 HB vs 225 HB). Haynes 188-AW runs hotter in service (1,050°C vs 760°C continuous). On the shop floor, Haynes 188-AW welds better (very good vs good).
Haynes 188-AWChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
Haynes 188-CWChoose it when strength drives the design.
Haynes 188-AW vs Haynes 188-CW: 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.
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 232 GPa33.6 Msi · Shear Modulus 89 GPa12.9 Msi · Bulk Modulus 193 GPa28 Msi · Poisson's Ratio 0.3
Physical
Density and transition temperatures.
Same in both: Density 8.98 g/cm³0.32 lb/in³ · Melting Point (Solidus) 1,302°C2,376 °F · Liquidus Temperature 1,330°C2,426 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 10.8 W/m·K6.2 BTU/hr·ft·°F · Specific Heat Capacity 403 J/kg·K0.1 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 11.9 µm/m·K6.6 µin/in·°F · Min Service Temperature -196°C-321 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 1.7 % IACS · Electrical Resistivity 1.01×10⁻⁶ Ω·m39.8 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 35 / 100 · Brazeability / Solderability 60 / 100 · Polishability 70 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 280 MJ/kg120,378 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.
Haynes 188-AW vs Haynes 188-CW — frequently asked
Is Haynes 188-CW stronger than Haynes 188-AW?
Yes. Haynes 188-CW has a typical yield strength of 1,250 MPa (181 ksi) against 490 MPa (71.1 ksi) for Haynes 188-AW — about 155% more. Tensile strength is 1,450 MPa (210 ksi) vs 840 MPa (122 ksi).
Which condition does FabDigit quote by default, AW or CW?
SA is the default Haynes 188 condition in the FabDigit quote flow (neither AW nor CW). 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, Haynes 188-AW or Haynes 188-CW?
Haynes 188-AW. Its weldability rates very good (75/100) against good (55/100) for Haynes 188-CW.
Ready to make it?
Upload a CAD file and FabDigit prices the part in Haynes 188-AW and Haynes 188-CW 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.