Special Metals UDIMET® alloy 188 Cobalt-base Alloy

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Special Metals UDIMET® alloy 188 Cobalt-base Alloy
Categories:	Metal; Nonferrous Metal; Cobalt Alloy
Material Notes:	UDIMET® alloy 188 (UNS R30188) is a cobalt-base alloy with excellent high-temperature strength and good oxidation resistance to 2000°F (1093°C). The high chromium level coupled with small additions of lanthanum produce an extremely tenacious and protective scale. The alloy also has good sulfidation resistance and excellent metallurgical stability as displayed by its good ductility after prolonged exposure to elevated temperatures. Good fabricability and weldability combine to make the alloy useful in gas turbine applications such as combustors, flame holders, liners and transition ducts. Information Provided by Special Metals Corporation
Key Words:	UNS R30188; AMS 5608; AMS 5772
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Physical Properties	Original Value	Comments

Density	9.14 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength at Break	963 MPa
	125 MPa @Temperature 1100 °C
	700 MPa @Temperature 650 °C
	850 MPa @Temperature 200 °C
Tensile Strength, Yield	446 MPa
	50.0 MPa @Strain 0.2 %, Temperature 1100 °C
	350 MPa @Strain 0.2 %, Temperature 650 °C
	425 MPa @Strain 0.2 %, Temperature 200 °C
Elongation at Break	55 %
	40 % @Temperature 1100 °C
	60 % @Temperature 200 °C
	60 % @Temperature 650 °C
Rupture Strength	9.00 MPa @Temperature 1093 °C, Time 3.60e+6 sec	Sheet
	15.0 MPa @Temperature 1038 °C, Time 3.60e+6 sec	Sheet
	25.0 MPa @Temperature 982 °C, Time 3.60e+6 sec	Sheet
	41.0 MPa @Temperature 927 °C, Time 3.60e+6 sec	Sheet
	69.0 MPa @Temperature 871 °C, Time 3.60e+6 sec	Sheet
	110 MPa @Temperature 816 °C, Time 3.60e+6 sec	Sheet
	165 MPa @Temperature 760 °C, Time 3.60e+6 sec	Sheet
	240 MPa @Temperature 704 °C, Time 3.60e+6 sec	Sheet

Electrical Properties	Original Value	Comments
Electrical Resistivity	613 ohm-cir-mil/ft
Magnetic Permeability	1.0007	at 200 Oersted

Thermal Properties	Original Value	Comments
CTE, linear	11.9 µm/m-°C @Temperature 93.0 °C
Specific Heat Capacity	0.405 J/g-°C @Temperature 21.0 °C
Thermal Conductivity	12.1 W/m-K
Melting Point	1300 - 1330 °C
Solidus	1300 °C
Liquidus	1330 °C

Component Elements Properties	Original Value	Comments
Boron, B	<= 0.015 %
Carbon, C	0.050 - 0.15 %
Chromium, Cr	20 - 24 %
Cobalt, Co	30.965 - 46.73 %	Balance
Iron, Fe	<= 3.0 %
Lanthanum, La	0.020 - 0.12 %
Manganese, Mn	<= 0.15 %
Nickel, Ni	20 - 24 %
Silicon, Si	0.20 - 0.50 %
Tungsten, W	13 - 16 %

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NINDA16 / 98907

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