AISI 4140 Steel

Steel name: AISI 4140
Diagram No.: 8166
Type of diagram: CCT
Mat. No. (Wr. Nr.) designation: 1.7227
DIN designation: 42CrMoS4
AISI/SAE designation: AISI 4140
Chemical composition in weight %: 0.41% C, 0.25% Si, 0.76% Mn, 0.012% P, 0.012% S, 1.05% Cr, 0.19% Mo, 0.17% Ni, 0.029% Al, 0.0070% N
Steel group: Structural steels
Note: Austenitizing temperature: 850 C, holding time: 10 min.
Reference: Not shown in this demo version.
A. Gramlich et al.: Manganese Alloyed Q & T Steel with high Hardenability for Forging Parts with large Diameters. HTM J. Heat Treatm. Mat. 74 (2019) 6, pp. 357-365, DOI:10.3139/105.110397

Transformation Diagram


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