The structure and properties of 1.2379 die steel

     1, The characteristics of 1.2379 die steel
     1.2379 steel by conventional smelting, organizational structure is precision, is cold work tool steel, high wear resistance, good stability, good hardenability and hardness, good compressive strength and good toughness.
     2, Typical chemical composition (mass fraction,%)
     C1.50 ~ 1.60, Cr11.00 ~ 12.00, Mn0.15 ~ 0.45, Si0.20 ~ 0.60, P≤0.030, S≤0.030, Mo0.70 ~ 0.90, V0.90 ~ 1.10.
     3, Refer to the corresponding steel No.
     China GB standard steel No. Cr12Mo1V1, American AISI / ASTM standard steel No. D2, Japan JIS standard steel No. SKD11, German DIN standard steel No. X155CrVMo121, German DIN standard material number 1.2379 steel.
     4, The physical Properties of 1.2379 die steel
     Temperature 20 ~ 100 °C / 20 ~ 200 °C / 20 ~ 300 °C / 20 ~ 400 °C / 20 ~ 500 °C, coefficient of linear expansion 10.5 × 10-6K-1 / 11.0 × 10-6K-1 / 11.0 × 10- 6K-1 / 11.5 × 10-6K-112.0 × 10-6K-1.
     5, Temperature 20 °C / 350 °C / 700 ℃, thermal conductivity 16.7 [W / (mK)] / 20.5 [W / (mK)] / 4.2 [W / (mK)].
Quenching, tempering specification
The quenching temperature 980 ~ 1000 °C, gas cooling / oil cooling / 500 °C nitrate cooling.
The quenching temperature 1020 ~ 1040 °C, gas cooling / oil cooling / 500 °C nitrate cooling.
The quenching temperature 1060 ~ 1080 °C, gas cooling / oil cooling / 500 °C nitrate cooling.
Tempering temperature 180 ~ 300 °C / 500 ~ 570 °C, tempering time 1h / 20mm, at least 2 hours, still air cooling.
Typical application: suitable for making mold, extrusion mold stamping die.

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