Udimet 188 Round Bar

Product Details

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 displayed by its ductility after prolonged exposure to elevated temperatures. Fabricability and weldability combine to make the alloy useful in typical gas turbine applications such as combustors, flame holders, liners and transition ducts.

STANDARD PRODUCT FORMS
Forging billet, bar, plate, and sheet.

MAJOR SPECIFICATIONS
UNS R30188, AMS 5608, AMS 5772

LIMITING CHEMICAL COMPOSITION, %
Limiting
C .......0.05 – 0.15
Mn .......1.25 max.
Si ...........0.2 – 0.5
Cr ......20.0 – 24.0
Ni ......20.0 – 24.0
W ......13.0 – 16.0
La .....0.02 – 0.12
Fe ..........3.0 max.
Co ...........Balance
B .......0.015 max.

PHYSICAL CONSTANTS AND THERMAL PROPERTIES
Density, Ib/in3........................................................................0.330
g/cm3.........................................................................9.13
Melting Range, °F...................................................2375 –2425
°C ...................................................1300– 1330
Specific Heat, Btu/lb • °F....................................................0.097
J/kg • °C...........................................................405
Coefficient of Expansion, 70 – 200°F, 10-6in/in • °F........6.6
21 – 93°C, µm/m • °C ............11.9
Thermal Conductivity, Btu • in/ft2 • h • °F..............................84
W/m • °C..........................................12.1
TYPICAL MECHANICAL PROPERTIES