HAYNES® 188 alloy

HAYNES® 188 alloy is a cobalt-nickel-chromium-tungsten alloy that possesses excellent strength and corrosion resistance at elevated temperatures.

 

Chemical composition

Composition

UNS R30188
%

Carbon 0.05 - 0.15
Manganese 1.25 max
Silicon 0.20 - 0.50
Chromium 20.00 -24.00
Tungsten 13.00 - 16.00
Iron 3.00 max
Cobalt Balance
Lanthanum 0.03 - 0.15
Nickel 20.00 - 24.00

 

Physical properties

  Metric English
Density 8.98 g/cm³ 0.324 lbs/in³
Modulus of Elasticity 232 GPa 33.7 Mpsi
Electrical Resistivity 101.0 µohm*m 39.6 µohm*in
Thermal Conductivity 10.4 W/m*°K 72 BTU*in/hr*ft²*°F
Coefficient of thermal expansion 12.1 µm/(m*°C) 6.7 µin/(in*°F)

*Values calculated at 22 °C [72 °F]

 

Mechanical properties

Cold worked
%

Yield strength

Ultimate tensile strength

Elongation
%

0 938 MPa [136 ksi] 1324 MPa [192 ksi] 34
20 1110 MPa [161 ksi] 1544 MPa [224 ksi] 5.6
37 1641 MPa [238 ksi] 2013 MPa [292 ksi] 4.1

50

1813 MPa [263 ksi] 2165 MPa [314 ksi] 3.3

* Values are typical and may not represent all diameters. Test method will affect results.
All data represent results from a 25.4 cm [10 in] test gauge length.

 

HAYNES® 188 alloy

HAYNES® 188 alloy is a cobalt-nickel-chromium-tungsten alloy that possesses excellent strength and corrosion resistance at elevated temperatures.

 

Chemical composition

Composition

UNS R30188
%

Carbon 0.05 - 0.15
Manganese 1.25 max
Silicon 0.20 - 0.50
Chromium 20.00 -24.00
Tungsten 13.00 - 16.00
Iron 3.00 max
Cobalt Balance
Lanthanum 0.03 - 0.15
Nickel 20.00 - 24.00

 

Physical properties

  Metric English
Density 8.98 g/cm³ 0.324 lbs/in³
Modulus of Elasticity 232 GPa 33.7 Mpsi
Electrical Resistivity 101.0 µohm*m 39.6 µohm*in
Thermal Conductivity 10.4 W/m*°K 72 BTU*in/hr*ft²*°F
Coefficient of thermal expansion 12.1 µm/(m*°C) 6.7 µin/(in*°F)

*Values calculated at 22 °C [72 °F]

 

Mechanical properties

Cold worked
%

Yield strength

Ultimate tensile strength

Elongation
%

0 938 MPa [136 ksi] 1324 MPa [192 ksi] 34
20 1110 MPa [161 ksi] 1544 MPa [224 ksi] 5.6
37 1641 MPa [238 ksi] 2013 MPa [292 ksi] 4.1

50

1813 MPa [263 ksi] 2165 MPa [314 ksi] 3.3

* Values are typical and may not represent all diameters. Test method will affect results.
All data represent results from a 25.4 cm [10 in] test gauge length.