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AISI 304 Steel
Steel name: AISI 304
Diagram No.: 7287
Type of diagram: TTS
Mat. No. (Wr. Nr.) designation: ~1.4301
DIN designation: X5CrNi18-10
AISI/SAE designation: AISI 304
Chemical composition in weight %: max. 0.07% C, max. 0.75% Si, max. 2.00% Mn, max. 0.045% P, max. 0.03% S, 17.50-19.50% Cr, 8.00-10.50% Ni, max. 0.10% N
Steel group: Austenitic stainless steels
Note: TTS diagram for Type 304 stainless steel with various carbon contents. Figure shows TTT curves for a number of Type 304
stainless steels with a variety of carbon contents,
which reveal several things. Above about 900°C
(1650°F) the steels remain completely austenitic.
Between about 540°C and 900°C (1,000°F and
1,650°F), the time to begin precipitation varies by
more than an order of magnitude. Chromium carbide
precipitation kinetics is much slower in steels with
lower carbon contents. From a practical standpoint,
the curves show that when annealing or welding
these steels with, they must be cooled rapidly below
the nose of the curves to avoid sensitization and the
associated danger of localized corrosion. Lowering
the carbon content extends the available time for
cooling, making it easier to avoid sensitization.
Chromium carbide precipitation in standard grades is
well understood. Information on required cooling
rates for different section sizes is available and
alternative alloys exist to meet special situations.
These include low carbon grades (Types 304L and
316L), stabilized grades (Types 321 and 347), and
nitrogen modified standard grades that use nitrogen
additions to retard the chromium carbide precipitation
rate.
Reference: Not shown in this demo version.
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Disclaimer: The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.