1.2738 mod. Steel

Steel name: 1.2738 mod.
Diagram No.: 424
DIN designation: 40CrMnNiMo8-6-4 mod.
Mat.No. (Wr.Nr.) designation: 1.2738 mod.
Chemical composition in weight %: 0.35 - 0.45% C, 0.20-0.40% Si, 1.30 - 1.60% Mn, <0.020% P, <0.002% S, 1.80 - 2.10% Cr, 0.15 - 0.25% Mo, 0.90 - 1.10% Ni, 0.05% V
Steel group: Prehardened alloyed tool steel
Applications: No data
Comment: Steel is a prehardened CrMnNiMo-alloyed tool steel for the construction of plastic molds with superior surface requirements on molds. It is characterized by excellent polishability, photoetchability, spark erosion behaviour and dimensional stability as well as good machinability. Steel shows a better through-hardening compared to 1.2311.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 840-860oC/warm bath, air
Tempering: See the diagram
Note: Diagram: specimen size: dia 35 mm x 50 mm, hardened at 840oC/oil, tempering time: 1h, air cooling

Tempering Diagram

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