Formadur - SCHMOLZ-BICKENBACH.US

Formadur
(X19NiCrMo4)
Steel properties
Standards
Physical properties
2764
C 0.19 Cr 1.30 Mo 0.20 Ni 4.10
Case-hardening steel, high core strength, good polishability.
AISI ~P21
Coefficient of thermal expansion
at °C 20 – 100 20 – 200 20 – 300 20 – 400
10 -6 m/(m • K) 12.1 13.0 13.1 13.5
Thermal conductivity
at °C 20 350 700
W/(m • K) 33.5 32.5 32.0
Applications
Heat treatment
Highly stressed plastic moulds, tool holders for cutter picks.
Soft annealing °C Cooling Hardness HB
620 – 660 Furnace Max. 250
Stress-relief annealing °C Cooling
600 Furnace
Carburizing °C Intermediate Hardening °C Quenching Hardness after
annealing °C
quenching HRC
860 – 890 600 – 630 780 – 810 Oil or saltbath, 62
180 – 220 °C
860 – 890 600 – 630 800 – 830 Air 56
Tempering °C 100 200 300 400 500 600
after oil hardening HRC 62 60 58 56 52 49
after air hardening HRC 56 55 53 51 48 45
Time-temperaturetransformation
diagram
1200
1100
1000
Temperature in o C
900
800
Ac 3 (0.4 K/min)
700
Ac 1 (0.4 K/min)
600
2 5 10 17 F 30 35
P
A
1 3 6 15
23
0.14 0.38 1.0 1.5 2.3 6.3
20 10 5
500
2.5 K/min 0.4 K/min 0.2 K/min
1.25 K/min
M S
B K/min
400
2
50
M
75
50%
90
300
95 96
95 91
84 75
53
40
200
90%
12
RA =
8 11
10 8
100 Hardness
345
HV 10
480 465 420 405 390 365 355 340 335 325 305 295
0
10 0 10 1 10 2 10 3 10 4 10 5 10 6
Time in sec
10 0 10 1 10 2 10 3 10 4
Time in min
10 0 10 1 10 2
Time in hr
Tempering diagram
70
66
62
58
Oil
Hardness in HRC
54
50
46
42
Air
38
34
Reference numbers in
brackets are not standardized
in EN ISO 4957.
30
0 100 200 300 400 500 600 700 800
Tempering temperature in °C