Topics CoveredIntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesFabrication and Heat Treatment Machinability Forming Welding Heat Treatment Forging Hot Working Cold Working AnnealingApplications
Super alloys or high performance alloys have the ability to function at high temperatures and under mechanical stress. They have good creep and oxidation resistance, and are available in different forms. Solid-solution hardening, work hardening, and precipitation hardening are performed in order to enhance their strength. They are categorized into three groups such as cobalt-based, nickel-based, and iron-based super alloys.
Alumel™ is a high nickel alloy. The datasheet given below will discuss about Alumel™.
The chemical composition of Alumel™ is outlined in the following table.
The physical properties of thermocouple wire type K – Std Alumel™ are given in the following table.
The following table shows the mechanical properties of Alumel™.
|Tensile strength at break (annealed)
|Tensile strength at break (stress relieved)
|Tensile strength at break (hard)
The thermal properties of Alumel™ are displayed in the following table.
|Thermal expansion co-efficient (@ 20°C/68°F)
||206 BTU in/hr.ft².°F|
Fabrication and Heat Treatment
Alumel™ has good machinability.
Alumel™ has good formability.
Alumel™ can be welded using conventional methods.
Alumel™ is heat treated by annealing at 1066°C (1950°F) followed by cooling.
Alumel™ is forged at 1149°C (2100°F).
Alumel™ is hot worked at 705 to 1038°C (1300 to 1900°F).
Alumel™ has good cold working capacity.
Alumel™ is annealed at 1066°C (1950°F) followed by cooling.
Alumel™ can be used with a chromel alloy to develop a thermocouple.