Description / Abstract:
This specification establishes maximum permissible limits for
elements not normally specified but which may occur in trace
amounts in wrought nickel, cobalt, and iron alloy products.
Application:
Control provided by this specification has been used typically
for highly-stressed rotating parts, such as turbine discs, where
control of trace elements is required to maintain
elevated-temperature tensile, stress-rupture, creep, and low-cycle
fatigue properties, but usage is not limited to such
applications.
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.