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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