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    AISI P20
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Plastic Mould Steel

AISI P20


Chemical Composition:
Typical analysis in %
C
Mn
Cr
Mo
0.40
1.5
1.9
0.2

Steel properties: Prehardened plastic mould steel, hardness in as supplied condition 280 325 HB. Good machinability, suitable for texturing, better polishability.

 

Physical properties:

Coefficient of liner thermal expansion

10-6 m/(m K)

20-100
20-200
20-300ºC
Annealed
12.8
13.2
13.8
Quenched and tempered
12.4
13.0
13.4
 
 
Thermal conductivityW/(m K)
100
150
200
250
300 ºC
Annealed
39.7
40.6
41.5
41.8
42.0
Quenched and tempered
34.0
34.0
33.6
32.9
31.9



Applications : Plastic moulds, mould frames for plastic moulds and pressure casting dies, recipient sleeves.

 
Heat treatment:
Soft annealing ºC
Cooling
Hardness HB
 
710-740
Furnace
max. 235
 

 

Hardening
Quenching
Hardness and tensile strength after quenching
 
ºC
  
HRC
N/mm2
 
840-870
Oil or Saltbath
180 220 ºC
51
1730
 
Tempering
ºC
100
200
300
400
500
600
700
 
HRC
51
50
48
46
42
36
28
 
N/mm2
1730
1670
1570
1480
1330
1140
920
 
 
 
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