AISI 4340 Steel

Steel name: AISI 4340
Diagram No.: 5028
Type of diagram: CCT
Mat. No (Wr.Nr) designation: 1.6565
AISI/SAE designation: AISI 4340
SAE designation: J1397
Chemical composition in weight %: 0.37-0.43% C, 0.23% Si, 0.7% Mn, max. 0.035% P, max. 0.04% S, Cr 0.7-0.9% Cr, 0.2-0.3% Mo, 1.83% Ni
Steel group: Structural steels
Note: Continuous cooling diagram for 4340 steel, United States Steel Corporation, 1948. The colored circles refer to transformations that are discussed in the text.
Reference: Not shown in this demo version.

Transformation Diagram

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