Basic information of DIN 1.2379
1.2379 die steel is a kind of high carbon high chromium alloy tool steel. It has high hardness and wear resistance after heat treatment, and has strong hardenability and good dimensional stability. 1.2379 die steel and NAK80 die steel are suitable for making. High precision long life cold working die and thermosetting plastic mold.
It equivalent steel grade:
China GB standard grade Cr12Mo1V1, US AISI/ASTM standard grade D2, Japan JIS standard grade SKD11, German DIN grade grade X155CrVMo121, Japan Hitachi (HITACHI) standard grade SLD, Japan Datong (DAIDO) standard grade DC11, Japan Fujitsu (NACHI) standard The brand CDS11, the Austrian Bailu standard grade K110.
Form of 1.2379 otai supply:
As a mold steel,usually we supply 1.2379 in form of steel plate, and we can cut it as per your requests.or you can cut if by youself
DIN 1.2379 Chemical composition:
| C | Si | Mn | S | P | Cr | Mo | V |
| 1.45-1.6 | 0.1-0.6 | 0.2-0.6 | Max 0.03 | Max 0.03 | 11.0-13.0 | 0.7-1.0 | 0.7-1.0 |
DIN 1.2379 Reference picture:
DIN 1.2379 mold steel characteristic:
● Vacuum degassing and refining treatment to ensure steel purity.
● Spheroidizing annealing softening treatment, good cutting performance.
● Reinforced element vanadium, special addition of molybdenum, excellent wear resistance.
Cryogenic treatment specification
Cryogenic treatment: To get the highest hardness and dimensional stability, the mold is cryogenically cooled immediately after quenching -70 to -80 ° C for 3-4 hours, then tempered, cryogenically treated tool or mold hardness is 1-3HRC higher than conventional heat treatment . Parts with complex shapes and large dimensional changes, after cryogenic treatment has the risk of cracking
Typical application of DIN 1.2379 :
● Thickness is not more than 2MM thin plate, high efficiency blanking die, punching die and stamping die
● Various scissors, inlaid blades, woodworking blades.
● Thread rolling die and wear-resistant slider.
● Cold heading mold, thermosetting resin molding die.
● Deep drawing die, cold extrusion die.
Physical properties of DIN 1.2379:
Quenched and tempered to a hardness of 63HRC. Its physical properties at room temperature and high temperature
1) When the temperature is 20 °C, the density is 7700g/cm, the thermal conductivity is 20. 0W/(m – K), and the elastic modulus is 210000MPa.
2) Temperature 200 ° C, density 7650g / cm, coefficient of linear expansion (20 ° C) 12.2 × 10K, thermal conductivity: 21.0W / (m – K), elastic modulus 200000MPa.
3) When the temperature is 400 °C, the density is 7600g/cm, the thermal conductivity is 23.0W/(m – K), and the elastic modulus is 180,000MPa.
Annealing of DIN 1.2379:
As a mold steel,we have to process with annealing immediately after heating but before hardening. Under protective gas, heat to 800~850 °C, cool to 600 °C at a cooling rate of 10 °C / h, then cool in air,get a hardness ≤ 250HBw.
Stress releasing of DIN 1.2379
To release the stress that left after rough machined, it required to heat the steel mold to 650 °C, and hold the temperature for 2 hours ,cooling to 500 °C in furnace, and then cool to ambient temperature in air
Quench and temper:
Preheat to temperature 550-600 °C,hold at this temperature for 30 mins per inch of thickness,and then preheat to 800-850 °C,hot this temperature for 30 mins per inch of thickness ,austenitizing temperature 975-1040. hold at this temperture for 30mins per inch of thickness, oil (40-70 °C) or air cooling to 50-70 °C and then temperting immediately
1) Low temperature tempering: tempering temperature 150 ~ 200 ° C, about 60mín per 25mm, open space, hardness ≥ 61HRC. Low temperature tempering should use a lower austenitizing temperature of 975 ~ 1025 °C.
2) High temperature tempering: tempering temperature 480~540°C, maintaining about 25min per 25mm, air cooling, tempering more than twice, hardness ≥58HRC. High-temperature tempering should use a higher austenitizing temperature of 1000 ~ 1040 °C.
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