1.2842, 90MnCrV8, ASTM O2 Cold work tool steel
1. Application:
Highly exposed moulds for plastic material casting. Dieing and perforation devices for sheet metal up to 6 mm, cutting devices for cold work. Devices for cutting threads.
2. Characteristics:
Medium alloyed steel for cold work and good ability to harden, low dimension deformability during heat processing, high resistance to wear, and high compression strength.
3. Chemical composition (%)
|
C
|
Mn
|
Si
|
P
|
S
|
Cr
|
V
|
|
0.85-0.95
|
1.80-2.20
|
0.10-0.40
|
max.
0.030 |
max.
0.030 |
0.20-0.50
|
0.05-0.20
|
4. Mechanical properties:
Oil hardenable medium alloyed cold work tool steel, highest dimensional stability during heat treatment, shallow dept of hardening, good wear resistance and toughness, easy to machine and simple heat treatment, good cutting ability and edge holding properties, low distortion, low polishability.
5. Delivery condition:
Annealed steel, max.229 HB.
6. Available sizes:
Round Bar: Φ 6-410mm
Flat: 8-160*205-710mm
Mould: 200*200-1200*1000mm
Length: 3000-6000mm
Mill deliver conditions, or sawing or cutting for customer request.
7. Physical features:
|
Temperature [oC]
|
20-100
|
20-200
|
20-300
|
20-400
|
|
Thermal expansion [10-6.K-1]
|
12.2
|
13.2
|
13.8
|
14.4
|
|
Temperature [oC]
|
20
|
350
|
700
|
|
|
Heat conductivity [W.m-1.K-1]
|
32.8
|
32.1
|
35.1
|
|
8. Heat treatment:
|
Soft annealing:
|
Temperature [oC]
|
Cooling
|
|
700-730
|
Furnace
|
|
|
Annealing after decreasing stress:
|
Temperature [oC]
|
Cooling
|
|
600-650
|
Furnace
|
|
|
Hardening and tempering:
|
Temperature [oC]
|
Hardening
|
|
780-820
|
Oil, Salt bath ( 220 - 250 °C )
|
Hardness after quenching: 63 - 65 HRC
Hardness after tempering:
100 °C 200 °C 300 °C 400 °C
64 HRC 62 HRC 57 HRC 50 HRC