| Equivalent grades |
GB |
DIN |
AISI |
JIS |
DAIDO |
| 3Cr2MnNiMo |
1.2738 |
P20+Ni |
-- |
-- |
| Chemical Composition |
C |
Si |
Mn |
Cr |
P |
S |
Ni |
Mo |
W |
Other |
| 0.35-0.48 |
0.20-0.40 |
1.30-1.60 |
1.80-2.10 |
0.03MAX |
0.03MAX |
0.90-1.20 |
0.15-0.25 |
- |
- |
| Available size |
Round Bar |
Diameter |
Length |
| 60-800mm |
2000-6000mm |
| Flat Bar |
Thickness |
Width |
Length |
| 25-400mm |
200-800mm |
2000-6000mm |
| Surface condition |
Black surface/ Grinded/ Machined |
| Annealed hardness |
28-35 HCR (After tempering ) |
| Characteristics |
Good polishing and photo-etching properties Good machinability High purity and good homogeneity Uniform hardness |
| Applications |
Injection moulds for thermoplastics |
| Extrusion dies for thermoplastics |
| Blow moulds |
| Forming tools, press – brake dies (possibly flame hardened or nitrided ) |
| Aluminium die casting prototype dies |
| Structural components, shafts . |
| Heat Treatment |
Annealing
|
710 - 730 °C |
Hardness after annealing
|
Max. 240 HB |
Stress relieving
|
Approx. 600 °C |
Hot forming
|
1050 - 850 °C |
Hardening
|
870 - 890 °C |
Quenching media
|
Oil, Salt bath, Vacuum |
Hardness after quenching
|
50 - 54 HRC |
Hardness after tempering
|
100 °C |
200 °C |
300 °C |
400°C |
| 52HRC |
51HRC |
49HRC |
46HRC |
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