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Explore the World of Soft…e: Engineering & Science
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CATEGOR.TXT
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1994-11-01
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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.