Trace Element Control Nickel Alloy Castings
|Publication Date:||1 July 1992|
This specification establishes maximum permissible limits for elements not normally specified but which may occur in trace amounts in nickel alloy castings.
Primarily for limited use to achieve premium-quality material for
highly-stressed rotating parts,
such as turbine blades, where control of trace elements is required to
It is intended that this specification be invoked only for selected applications by stipulation on drawings, purchase orders, or other documentation supplementing the material specification or in material specifications.
This specification covers two classes of trace element control, defined by the elements to be controlled as follows:
Class 1 - Lead, Bismuth, Selenium, Tellurium, and Thallium
Class 2 - Lead, Bismuth, Selenium, Tellurium, Thallium, and Others (See 3.1.2)
Class 3 - Cancelled, use Class 1
Class 4 - Cancelled, use Class 2
1.3.1 When trace element control is required, the elements to be controlled will be indicated by this specification number and a suffix number indicating the class. For example, AMS 2280-1 will indicate that control of lead, bismuth, selenium, tellurium, and thallium is required. If no class is indicated, Class 1 shall apply.