Topics CoveredIntroductionChemical CompositionPhysical PropertiesMechanical PropertiesFabrication and Heat Treatment Machinability Forming Tempering HardeningApplications
Super alloys or high performance alloys have an ability to function at temperatures above 540ºC(1000ºF) with deformation resistance and high surface stability. As they have good oxidation and creep resistance, super alloys can be commonly forged, rolled to sheet or produced in various shapes. Iron-base, nickel-base and cobalt-base alloys are the major types of super alloys. Nickel-base and cobalt-base super alloys may be cast or wrought based on its composition or application. The iron-base super alloys are generally wrought alloys, that can be strengthened by precipitation hardening, work hardening and solid-solution hardening.
The following datasheet provides a detailed description of super alloy 21-4N valve steel.
The following table shows the chemical composition of super alloy 21-4N valve steel.
The physical properties of super alloy 21-4N valve steel are given in the following table.
The mechanical properties of super alloy 21-4N valve steel are displayed in the following table.
|Modulus of elasticity
Fabrication and Heat Treatment
Super alloy 21-4N valve steel can be machined similar to that of the standard 18-8 stainless steels.
Forming of super alloy 21-4N valve steel can be performed at 950 to 1100ºC (1742 to 2012ºF).
Super alloy 21-4N valve steel can be tempered at 730 to 780ºC (1346 to 1436ºF)
Super alloy 21-4N valve steel can be hardened at 1140 to 1180ºC (2084 to 2156ºF) and then water quenched.
Super alloy 21-4N valve steel is widely used in the manufacture of automotive valve.