Both flat and round are available in all sizes.
C |
CO |
Cr |
Mn |
Mo |
Ni |
P |
S |
Si |
| 0.28 – 0.40 | – | 1.40 – 2.00 | 0.60 – 1.00 | 0.30 – 0.55 | – | 0.03 Max. | 0.03 Max. | 0.20 – 0.80 |
P20 hh Steel is heated slowly and forged at1050°C( not below 930°C). Then it is cooled slowly.
P20hh Steel is heated four hours uniformly at a temperature of 770-790°C
, then soaked well and cooled down slowly in furnace at 10°C /hour max to 650°C and then cooled in air.
P20 HH Steel is heated to 460-500°C, then soaked well and cooled in air or is cooled in the furnace at room temperature.In order to relieve machine strains,stabilizing is recommended before finishing the machining,in parts where dies have to be heavily machined.
Uniformly P20 hh Steel is heated to 820-840°C and then oil quenched.
Uniform heating and soaking at tempering temperature is needed for minimum 1hour/25mm of section. Then it is cooled in still air.
TEMPERATURE°C HARDNESS(HRC) TENSILE [N/mm²]
100 51 1730
200 50 1670
300 48 1570
400 46 1480
500 42 1330
600 36 1140
| Temperature | Time | Approx. Depth of Case |
|---|---|---|
| 525ºC | 20 hours | 0.30mm |
| 525ºC | 40 hours | 0.35mm |
| 525ºC | 60 hours | 0.50mm |
P20 hh tool steel can have a 55-59HRC surface hardness.
700HV surface hardness can e attained by tuffriding at 570ºC.
After this process, tempering at 180°C for 4hours is required,thus prevents hydrogen emrittlement.
P20 hh attains 50-55HRC hardness after induction/flame hardening. Immediate tempering is required after hardening.P20 hh steel then needs to be air cooled.
It varies according to the shape and size of P20hh steel. P20hh steel is heated to 871-899 ºC in carburizing medium. After carburization, P20hh is heated to 816-871 ºC , then hold on for 15minutes. After this, oil quenching is done.
With our material,we provide mill test certificate and ultrasonic Ok certificate (Note: Provide only if mentioned before placing the order).
