1.7380 Steel

Steel name: 1.7380
Diagram No.: 5109
Type of diagram: CCT
DIN designation: 10CrMo9-10
Mat. No. (Wr. Nr.) designation: 1.7380
Chemical composition in weight %: 0.08-0.15% C, max. 0.50% Si, 0.40-0.70% Mn, max. 0.040% P, max. 0.040% S, 2.00-2.50% Cr, 0.90-1.20% Mo
Steel group: Alloy steels
Note: Austenitizing temperature: 970 C, 8 min.
The transformation behaviour of the steel 10CrMo9-10 has been studied for both continuous cooling and isothermal holding. During continuous cooling Fig, the hexagonal phase M2X (M2C) is precipitated in characteristic needle form from the pre-eutectoid ferrite.Towards the end of the transformation in the ferrite-carbide stage a ferrite-M2X eutectoid is formed, in which the carbides are arranged as borders.Another carbide phase, face-centred cubic M23C6, is precipitated during slow cooling in the transformation-free range between ferrite-carbide and bainite.
During isothermal transformation the formation of ferrite begins already at relatively short holding times. After considerably longer holding times, the carbides M2X and M23C6 are precipitated in the ferrite. The formation of the M2X-ferrite eutectoid starts at about the same time. The form of these carbides is similar to that of those formed.
Additional link: Record No. 5110
Reference: Not shown in this demo version.

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