AISI 431 Steel

Steel name: AISI 431
Diagram No.: 7742
Type of diagram: CCT
Mat. No. (Wr. Nr.) designation: 1.4057/1.2787
DIN designation: X17CrNi16-2/X22CrNi17
AISI/SAE designation: AISI 431
Chemical composition in weight %: 0.18% C, 16.50% Cr, 1.80% Ni
Steel group: Martensitic stainless steels
Note: Figure presents the CCT diagram for a martensitic stainless steel containing 13%Cr. It shows that the critical cooling rate resulting in no residual austenite is of approximately 15°C per minute. This means that the quenching rate is not really critical for these alloys and that quite low cooling rate allows obtaining 100% martensitic structures. For example, oil cooling enables reaching cooling rates of around 300°C per minute, which is sufficiently fast. As mentioned above, local intergranular residual austenite can still persist due to Si segregation during quenching.
Reference: Not shown in this demo version.

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