I. Austenitic - A family of
alloys containing chromium and nickel (and manganese and nitrogen
when nickel levels are reduced), generally built around the type
302 chemistry of 18% Cr, 8% Ni, and balance mostly Fe. These alloys
are not hardenable by heat treatment.
II. Ferritic - This group of alloys generally
containing only chromium, with the balance mostly Fe, are based
upon the type 430 composition of 17% Cr. These alloys are somewhat
less ductile than the austenitic types and again are not hardenable
by heat treatment.
III. Martensitic - The members of this family
of stainless steels may be hardened and tempered just like alloy
steels. Their basic building block is type 410 which consists
of 12% Cr, 0.12% C, and balance mostly Fe.
IV. Precipitation-Hardening - These alloys
generally contain Cr and less than 8% Ni, with other elements
in small amounts. As the name implies, they are hardenable by
heat treatment.
V. Duplex - This is a stainless steel alloy
group, or family, with two distinct microstructure phases -- ferrite
and austenite. The Duplex alloys have greater resistance to chloride
stress corrosion cracking and higher strength than the other austenitic
or ferritic grades.
VI. Cast - The cast stainless steels, in general,
are similar to the equivalent wrought alloys. Most of the cast
alloys are direct derivatives of one of the wrought grades, as
C-8 is the cast equivalent of wrought type 304. The C preceding
a designation means that the alloy is primarily used for resistance
to liquid corrosion. An H designation indicates high temperature
applications.
| Cast Steel | 304
| 316 | Composition
|
| Top of Page | UnitConversion
| SteamTable | StarchViscosity
| SieveComparison | TableIndex |
