p20 characteristics and heat treatment

p20 features:

P20 characteristics
● uniform hardness, having good polishing properties and photo-etching properties, and good processing properties.
● vacuum degassing refining processing pure steel polishing or etch processing plastic mold, suitable for requirements. ● status prehardened supply

No further heat treatment can be used directly in the mold processing, shorten the construction period.
● processing by forging rolled, organizations dense, 100% ultrasonic inspection, nonporous, the eye of a needle defects.
P20 uses
Applied to the shell in front of the television, telephone, water dispensers, vacuum cleaners and other plastic and die.
● thermoplastic plastic injection molds, extrusion dies. ● thermoplastic plastic blow mold.
● overloaded mold parts.
● Cold structural parts.
● commonly used in the manufacture of television cabinet, washing machine, refrigerator inner shell, buckets etc.
Heat treatment specifications:

● Heat treatment and microstructure specifications:
Hardening process: to improve die life of more than 80 million times, the implementation of the pre-hardened steel quenching and tempering hardened

The way to achieve. Quenching when the first the 500-600 ℃ preheated 2-4 hours, and incubated for a certain time (at least 2 hours and then at 850-880 ℃

) Into the oil cooled to 50-100 ℃ air-cooled oil the quenched hardness up to 50-52HRC, should be carried out immediately in order to prevent cracking

200 ° C low-temperature tempering, tempering hardness can be kept more than 48HRC
Nitriding process
Nitriding process can be obtained high hardness of the surface tissue the nitride surface hardness 650-700HV
(57-60HRC) mold life can reach more than 100 million times, the nitride layer has a compact structure, smooth characteristics, mold removal

The die and air humidity resistance and lye corrosion resistance can be improved.
● Delivery status: Delivery of steel to annealing, hot-rolled state.
The P20 factory-hardness
Pre-hardened 29 ~ 33HRC