No, these alloys are not considered cast stainless steel. They are referred to as Ni-Resist and Ductile Ni-Resist austenitic cast iron alloys. The Ni-Resist alloys can be classified into two common types - either standard graphite flake or ductile (spheroidal graphite).

As they are equivalent as stainless steel, of  iron,  they used to be called iron stainless alloy. I´ve read in some letters on internet. Idon´t know whether is true or not.

gorkus;
These are separate alloys with different corrosion properties in comparison to stainless steel, and should NOT be confused with cast stainless steel.

If you want more information on this subject, I would suggest you obtain a copy of the paper below from the Nickel Development Institute.


Paper 11018 “Properties and Applications of Ni-Resist and Ductile Ni-Resist Alloys”

http://www.stainlesswater.org/index.cfm/ci_id/11842.htm