OT718 mold steel
After forging and rolling, the structure is dense, 100% ultrasonic inspection, no pores, pinhole defects.
- a) The template of the large mold, the high surface requires household appliances.
- b) Suitable for large mirror plastic molds, such as automobiles, home appliances, audio and video products, etc.
- c) Can be used for plastic molds with mirror polishing requirements, suitable for injection molds, blow molds for PA, POM, PS, PE, PP, ABS plastics.
- d) High polishing and demanding mold cavity. Hardened
In order to improve the service life of the mold to more than 800,000 mold times, the pre-hardened steel can be implemented by hardening and low-temperature tempering. When quenching, first preheat at 500-600 ℃ for 2-4 hours, and then keep it at 850-880 ℃ for a certain period of time (at least 2 hours), put it in oil and cool it to 50-100 ℃, and leave it to air-cool. -52HRC, in order to prevent cracking, a low temperature tempering treatment at 200 ° C should be performed immediately. After tempering, the hardness can be maintained above 48HRC.
Collapse this section nitriding
Nitriding treatment can obtain high hardness surface layer structure, the hardness of the surface layer after nitriding reaches 650-700HV
(57-60HRC) The life of the mold can reach more than 1 million times. The nitrided layer has the characteristics of dense organization and smoothness. The mold release property and the resistance to humidity and alkali corrosion are improved.
Quenching and tempering
Quenching temperature 840 ~ 870 ° C, tempering temperature 200 ~ 500 ° C, hardness 50 ~ 55HRC
Edit the material properties of this paragraph
Folding physical properties
(Sample hardness 340HBW, at room temperature and high temperature)
1) Temperature 20 ° C / 200 ° C / 400 ° C, density 7.8g / cm / 7.75g / cm / 7. 7g / cm.
2) Temperature 20 ~ 200 ° C / 20 ~ 400 ° C, coefficient of linear expansion: 12.6 × 10K / 13.5 × 10K.
3) Temperature 20 ° C / 200 ° C / 400 ° C, thermal conductivity 29.0W · (m · K) /29.5W· (m · K) /31.0W· (m · K)
4) Temperature 20 ° C / 200 ° C / 400 ° C, elastic modulus: 205000MPa / 200000MPa / 185000MPa
Folding mechanical properties
(Sample hardness 340HBW)
1) Temperature 20 ° C / 200 ° C / 400 ° C, tensile strength 1100MPa / 1050MP8 / 850MPa.
2) Temperature 20 ° C / 200 ° C / 400 ° C, conditional yield strength 980MPa / 925MPa / 770MPa.
3) Temperature 20 ° C / 200 ° C / 400 ° C, reduction in area of 49% / 51% / 52%
4) Temperature 20 ° C / 200 ° C / 400 ° C, elongation 13% / 14% / 16%
5) Temperature 20 ° C / 200 ° C / 400 ° C, impact toughness (≥) 20J / cm / 32J / cm / 42J / cm
Critical temperature
critical point
Temperature (approximate) / ℃
Expand the expansion coefficient of this paragraph
Temperature / ℃
Linear (expansion) expansion coefficient / C
Edit the thermal conductivity of this paragraph
Temperature / ℃
