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1.2379

1.2379 is a high carbon, high chromium martensitic mold steel known for its high hardness and good wear resistance. 1.2379 mold steel is widely used in the field of mold manufacturing due to its excellent performance and stable material properties. It is suitable for making various high-speed blanking dies for silicon steel sheets, precision stamping dies, cold extrusion forming dies, drawing dies, punching dies, etc. Mold cutting, etc.
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CHEMICAL COMPOSITION

C: 1.5-1.6

Si: 0.1-0.4

Mn: 0.15-0.45

P: ≤ 0.03

S: ≤ 0.03

Cr: 11.0-12.0

V: 0.9-1.1

Mo: 0.6-0.8



MECHANICAL PROPERTIES

Hardness: In factory condition, the hardness does not exceed 235HB. After heat treatment, the hardness can reach 60-65HRC.

Yield strength: can reach more than 1200MPa.



PHYSICAL PROPERTIES

Thermal conductivity: The thermal conductivity is 21 W/m K at 100°C.

Density: At 20°C, the density is 7700 g/cm³, and the density decreases slightly as the temperature increases.

Elastic modulus: At 20°C, the elastic modulus is 210000 MPa. As the temperature increases, the elastic modulus decreases.



HEAT TREATMENT

Pre-heat Temperature: 840-860℃

Quenching Temperature: 1020-1050℃

Quenching Medium: oil,hot bath,air

Tempering Temperature: 150-200℃ Followed by Quenching

Hardness: Min 60HRC

Ac1: 830℃

Ac3: 855℃

Ar1: 750℃

Ms: 230℃



FORGING

Initial Forging Temperature:1010-1200℃

Final Forging Temperature:above 927℃

Forging Ratio:above 4:1

Cooling Method After Forged:As high carbon cold work tool steel ,DIN 1.2379 steel should be annealed after forging.

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