UNS G41400, UNS G43400 Steels

Steel name: UNS G41400, UNS G43400
Diagram No.: 8055
Type of diagram: TTT
UNS designation: UNS G41400, UNS G43400
AISI/SAE designation: 4140, 4340
Chemical composition in weight %:
Steel A, UNS G41400 (SAE/AISI 4140): 0.37% C, 0.77% Mn, 0.98% Cr, 0.21% Mo
Steel B, UNS G43400 (SAE/AISI 4340): 0.42% C, 0.78% Mn, 0.80% Cr, 0.33% Mo, 1.79% Ni
Steel group: Alloy steels
Note: TTT curves for (A) UNS G41400 (SAE/AISI 4140) steel (0.37-wt% C, 0.77-wt% Mn, 0.98-wt% Cr, and 0.21-wt% Mo) and (B) UNS G43400 (SAE/AISI 4340) steel (0.42-wt% C, 1.79-wt% Ni, 0.78- wt% Mn, 0.80-wt% Cr, and 0.33-wt% Mo), showing the effect of Ni on phase transformation kinetics, after Vander Voort (1991). A, austenite; F, ferrite; C, cementite. M50 and M90 indicate the temperature at which austenite is half transformed and 90% transformed to martensite, respectively.
Reference: Not shown in this demo version.

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