Explore the World of Soft…e: Engineering & Science/Explore_the_World_of_Software_Engineering_and_Science_HRS_Software_1998.iso/programs/dies/tsa_a.exe/TSA_4.EXE/CAST.TXT

Text File | 1994-11-01 | 2KB | 33 lines

Many of the wrought stainless steel alloys listed in this data base
have a cast alloy equivalent.  The stainless steel castings are most
often classified as either corrosion-resistant or heat-resistant in
terms of application.  The heat-resistant grades of castings usually
have a higher carbon content.  Cast alloys with a designation of "C"
as the first letter are generally intended for liquid corrosion service.
Those with an "H" designation are primarily intended for heat-resistant
use.

The corrosion resistance of the cast stainless alloys is essentially
equivalent to the wrought version of the same alloy composition.
However the cast alloys differ from the wrought counterpart in mechan-
ical properties (strength and ductility) and in magnetic properties.

Castings have a different microstructure than the wrought equivalent
alloys in that, for example, the cast austenitic stainless steels have
a small amount of ferrite present which is not the case in the wrought
version.  Of course castings also have the typical dendritic grain
structure and, depending upon size and section thickness, there may be
segregation or intergranular phases in the microstructure.  This
accounts for the lower mechanical properties of castings than for the
wrought counterparts.

In general it is desirable to use a matching alloy composition when
a cast shape is incorporated as a component into a design that utilizes
wrought stainless steel.  That is if Stainless 304 is used for piping,
as an example, than cast alloy CF-8 should be used as the matching cast
equivalent alloy - remember that the cast component is now the limiting
item from the strength or mechanical property standpoint.

The cast stainless steels may be machined or welded in similar manner
to the wrought stainless alloys.