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Special Metals UDIMET® alloy 188 Cobalt-base Alloy

Category Metal , Nonferrous Metal , Cobalt Alloy
Manufacturer Special Metals (includes the former Inco Alloys International Inc.)
Trade Name UDIMET®
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Special Metals UDIMET® alloy 188 Cobalt-base Alloy.pdf
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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
Physical Properties Metric English Comments
Density 9.14 g/cc
0.330 lb/in³
Mechanical Properties Metric English Comments
Tensile Strength at Break 963 MPa
140000 psi
125 MPa

@Temperature 1100 °C
 18100 psi

@Temperature 2010 °F
700 MPa

@Temperature 650 °C
 102000 psi

@Temperature 1200 °F
850 MPa

@Temperature 200 °C
 123000 psi

@Temperature 392 °F
Tensile Strength, Yield 446 MPa
64700 psi
50.0 MPa

@Strain 0.200 %,
Temperature 1100 °C
 7250 psi

@Strain 0.200 %,
Temperature 2010 °F
350 MPa

@Strain 0.200 %,
Temperature 650 °C
 50800 psi

@Strain 0.200 %,
Temperature 1200 °F
425 MPa

@Strain 0.200 %,
Temperature 200 °C
 61600 psi

@Strain 0.200 %,
Temperature 392 °F
Elongation at Break 55 %
55 %
40 %

@Temperature 1100 °C
 40 %

@Temperature 2010 °F
60 %

@Temperature 200 °C
 60 %

@Temperature 392 °F
60 %

@Temperature 650 °C
 60 %

@Temperature 1200 °F
Rupture Strength 9.00 MPa

@Temperature 1093 °C,
Time 3.60e+6 sec
 1310 psi

@Temperature 1999 °F,
Time 1000 hour
 Sheet
15.0 MPa

@Temperature 1038 °C,
Time 3.60e+6 sec
 2180 psi

@Temperature 1900 °F,
Time 1000 hour
 Sheet
25.0 MPa

@Temperature 982 °C,
Time 3.60e+6 sec
 3630 psi

@Temperature 1800 °F,
Time 1000 hour
 Sheet
41.0 MPa

@Temperature 927 °C,
Time 3.60e+6 sec
 5950 psi

@Temperature 1700 °F,
Time 1000 hour
 Sheet
69.0 MPa

@Temperature 871 °C,
Time 3.60e+6 sec
 10000 psi

@Temperature 1600 °F,
Time 1000 hour
 Sheet
110 MPa

@Temperature 816 °C,
Time 3.60e+6 sec
 16000 psi

@Temperature 1500 °F,
Time 1000 hour
 Sheet
165 MPa

@Temperature 760 °C,
Time 3.60e+6 sec
 23900 psi

@Temperature 1400 °F,
Time 1000 hour
 Sheet
240 MPa

@Temperature 704 °C,
Time 3.60e+6 sec
 34800 psi

@Temperature 1300 °F,
Time 1000 hour
 Sheet
Thermal Properties Metric English Comments
CTE, linear 11.9 µm/m-°C

@Temperature 93.0 °C
 6.61 µin/in-°F

@Temperature 199 °F
Specific Heat Capacity 0.405 J/g-°C

@Temperature 21.0 °C
 0.0968 BTU/lb-°F

@Temperature 69.8 °F
Thermal Conductivity 12.1 W/m-K
84.0 BTU-in/hr-ft²-°F
Melting Point 1300 - 1330 °C
2370 - 2430 °F
Solidus 1300 °C
2370 °F
Liquidus 1330 °C
2430 °F
Component Elements Properties Metric English Comments
Boron, B <= 0.015 %
<= 0.015 %
Carbon, C 0.050 - 0.15 %
0.050 - 0.15 %
Chromium, Cr 20 - 24 %
20 - 24 %
Cobalt, Co 30.965 - 46.73 %
30.965 - 46.73 %
Balance
Iron, Fe <= 3.0 %
<= 3.0 %
Lanthanum, La 0.020 - 0.12 %
0.020 - 0.12 %
Manganese, Mn <= 0.15 %
<= 0.15 %
Nickel, Ni 20 - 24 %
20 - 24 %
Silicon, Si 0.20 - 0.50 %
0.20 - 0.50 %
Tungsten, W 13 - 16 %
13 - 16 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.000102 ohm-cm
0.000102 ohm-cm
Magnetic Permeability 1.0007
1.0007
at 200 oersted
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