Haynes 188 alloy, hot rolled and 1175C solution annealed plate, tested at 760C (1400F)

Subcategory: Cobalt Base; Metal; Superalloy

Key Words: UNS R30188, AMS 5608, AMS 5772, AMS 5801

Component   Wt. %
BMax 0.015 
C0.05 - 0.15 
Cr21 - 23 
Component   Wt. %
FeMax 3 
La0.02 - 0.12 
MnMax 1.25 
Component   Wt. %
Ni20 - 24 
Si0.2 - 0.5 
W13 - 15 

Material Notes:
Cobalt composition to balance. Excellent high temperature strength and very good resistance to oxidizing environments up to 1095C for prolonged exposure, and excellent resistance to sulfate deposit hot corrosion. Readily fabricated and formed, excellent resistance to molten chloride salts, and good resistance to gaseous sulfidation. Applications include a variety of fabricated component applications in the aerospace industry, commercial gas turbine engines for combustion cans, transition ducts and afterburner components.

Data provided by the manufacturer, Haynes International, Inc.

Physical PropertiesMetricEnglishComments
Density8.98 g/cc0.324 lb/in at RT.

Mechanical Properties
Tensile Strength, Ultimate650 MPa94300 psi 
Tensile Strength, Yield270 MPa39200 psi at 0.2% offset
Elongation at Break70 %70 % in 51 mm
Modulus of Elasticity232 GPa33600 ksi RT
Modulus of Elasticity at Elevated Temperature153 GPa22200 ksi 1000C (1830F)
Modulus of Elasticity at Elevated Temperature161 GPa23400 ksi 900C (1650F)
Modulus of Elasticity at Elevated Temperature169 GPa24500 ksi 800C (1470F)
Modulus of Elasticity at Elevated Temperature176 GPa25500 ksi 700C (1290F)
Modulus of Elasticity at Elevated Temperature184 GPa26700 ksi 600C (1110F)
Modulus of Elasticity at Elevated Temperature193 GPa28000 ksi 500C (930F)
Modulus of Elasticity at Elevated Temperature201 GPa29200 ksi 400C (750F)
Modulus of Elasticity at Elevated Temperature209 GPa30300 ksi 300C (570F)
Modulus of Elasticity at Elevated Temperature217 GPa31500 ksi 200C (390F)
Modulus of Elasticity at Elevated Temperature225 GPa32600 ksi 100C (212F)
Charpy Impact194 J143 ft-lb at 20C, 158 J at -185C, 162 J at -100C, 159 J at 540C, 145 J at 705C, 194 J solution annealed, 31 J after 8000 hours at 650C, 4 J after 8000 hours at 760C, 12 J after 8000 hours at 870C

Electrical Properties
Electrical Resistivity0.000101 ohm-cm0.000101 ohm-cm RT
Electrical Resistivity at Elevated Temperature0.000103 ohm-cm0.000103 ohm-cm 100C (212F)
Electrical Resistivity at Elevated Temperature0.000105 ohm-cm0.000105 ohm-cm 200C (390F)
Electrical Resistivity at Elevated Temperature0.0001077 ohm-cm0.0001077 ohm-cm 300C (570F)
Electrical Resistivity at Elevated Temperature0.0001105 ohm-cm0.0001105 ohm-cm 400C (750F)
Electrical Resistivity at Elevated Temperature0.0001127 ohm-cm0.0001127 ohm-cm 500C (930F)
Electrical Resistivity at Elevated Temperature0.0001148 ohm-cm0.0001148 ohm-cm 600C (1110F)
Electrical Resistivity at Elevated Temperature0.0001164 ohm-cm0.0001164 ohm-cm 700C (1290F)
Electrical Resistivity at Elevated Temperature0.0001175 ohm-cm0.0001175 ohm-cm 800C (1470F)
Electrical Resistivity at Elevated Temperature0.0001183 ohm-cm0.0001183 ohm-cm 900C (1650F)
Electrical Resistivity at Elevated Temperature0.0001191 ohm-cm0.0001191 ohm-cm 1000C (1830F)

Thermal Properties
CTE, linear 20C11.9 m/m-C6.61 in/in-F 25-100C (77-212F)
CTE, linear 250C12.6 m/m-C7 in/in-F 25-200C (77-390F)
CTE, linear 500C13.2 m/m-C7.33 in/in-F 25-300C
CTE, linear 500C13.8 m/m-C7.67 in/in-F 25-400C
CTE, linear 500C14.5 m/m-C8.06 in/in-F 25-500C
CTE, linear 1000C15.2 m/m-C8.44 in/in-F 25-600C
CTE, linear 1000C15.8 m/m-C8.78 in/in-F 25-700C
CTE, linear 1000C16.5 m/m-C9.17 in/in-F 25-800C
CTE, linear 1000C17.1 m/m-C9.5 in/in-F 25-800C (77-1470F)
CTE, linear 1000C17.9 m/m-C9.94 in/in-F 25-1000C
Specific Heat Capacity0.403 J/g-C0.0963 BTU/lb-F RT
Specific Heat Capacity at Elevated Temperature0.423 J/g-C0.101 BTU/lb-F 100C (212F)
Specific Heat Capacity at Elevated Temperature0.444 J/g-C0.106 BTU/lb-F 200C (390F)
Specific Heat Capacity at Elevated Temperature0.465 J/g-C0.111 BTU/lb-F 300C (570F)
Specific Heat Capacity at Elevated Temperature0.486 J/g-C0.116 BTU/lb-F 400C (750F)
Specific Heat Capacity at Elevated Temperature0.502 J/g-C0.12 BTU/lb-F 500C (930F)
Specific Heat Capacity at Elevated Temperature0.523 J/g-C0.125 BTU/lb-F 600C (1110F)
Specific Heat Capacity at Elevated Temperature0.54 J/g-C0.129 BTU/lb-F 700C (1290F)
Specific Heat Capacity at Elevated Temperature0.557 J/g-C0.133 BTU/lb-F 800C (1470F)
Specific Heat Capacity at Elevated Temperature0.573 J/g-C0.137 BTU/lb-F 900C (1650F)
Specific Heat Capacity at Elevated Temperature0.59 J/g-C0.141 BTU/lb-F 1000C (1830F)
Thermal Conductivity10.4 W/m-K72.2 BTU-in/hr-ft-F RT
Thermal Conductivity at Elevated Temperature12.2 W/m-K84.7 BTU-in/hr-ft-F 100C (212F)
Thermal Conductivity at Elevated Temperature14.3 W/m-K99.2 BTU-in/hr-ft-F 200C (390F)
Thermal Conductivity at Elevated Temperature15.9 W/m-K110 BTU-in/hr-ft-F 300C (570F)
Thermal Conductivity at Elevated Temperature17.5 W/m-K121 BTU-in/hr-ft-F 400C (750F)
Thermal Conductivity at Elevated Temperature19.3 W/m-K134 BTU-in/hr-ft-F 500C (930F)
Thermal Conductivity at Elevated Temperature21.1 W/m-K146 BTU-in/hr-ft-F 600C (1110F)
Thermal Conductivity at Elevated Temperature23 W/m-K160 BTU-in/hr-ft-F 700C (1290F)
Thermal Conductivity at Elevated Temperature24.8 W/m-K172 BTU-in/hr-ft-F 800C (1470F)
Thermal Conductivity at Elevated Temperature25.5 W/m-K177 BTU-in/hr-ft-F 900C (1650F)
Thermal Conductivity at Elevated Temperature27.6 W/m-K192 BTU-in/hr-ft-F 1000C (1830F)
Melting Point1315 - 1410 C2400 - 2570 F 
Solidus1315 C2400 F 
Liquidus1410 C2570 F 
Maximum Service Temperature, Air1095 C2000 F 

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