Standards: 55NiCrMoV
| C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Ni
|
Mo
|
V
|
| 0.50-0.60
|
1.10-0.40
|
0.65-0.90
|
<0.015
|
<0.004
|
1.00-1.20
|
1.50-1.80
|
0.45-0.55
|
0.07-0.12
|
DB6 is highly recommendable for Close Die Forgings due to its characteristics of
high wear-resistance, extra toughness , high hardness which is achieved with Cr-Ni-Mo-V
high graded alloys.
The equivalent grade DB6 / L6 / SKT4 normally used as a pre hardened condition.
The standard hardness is 360 to 430 BHN. DIN 2714 is the upgraded version of DIN
2713 for better performance of dies.
We supply Die blocks as the extra Forging Reduction & Upsetting with Double
tempered to achieve the better Ultrasonic quality.
Steel Properties
The special Hot Work Pre hardened Steel with good toughness and high ware resistance.
Die Steel is normally supply in hard, quenched & tempered and also in annealed
condition in special case. Usually its working hardness is 360-430 BHN. This steel
grade is the upgrade version of DIN 2713 for better performance.
Physical Properties
|
Coefficient of thermal expansionat °C
|
20-100
|
20-200
|
20-300
|
20-400
|
20-500
|
20-600
|
|
10-6 m/(m*K)
|
12.1
|
13.1
|
13.2
|
13.5
|
14.1
|
14.3
|
|
Thermal Conductivity °C
|
20
|
350
|
700
|
|
W/(m*K)
|
35.0
|
39.0
|
36.0
|
Application
Dies for Drop Forging Hammers & Mechanical Presses, Die Molds, Shoe Blocks,
Die Holder, Cassettes, Piston Rods, Cranks, Boaster, Shearing Blades, Tools, plastic
molds, Shafts Etc.
Heat Treatment
| Soft annealing °C
|
Cooling
|
Hardness HB
|
| 650-710
|
Furnace
|
max. 240
|
| Hardening °C
|
Quenching
|
Hardness after quenching HRC
|
| 840-880
|
Oil
|
57
|
| 860-900
|
Air
|
55
|
|
Tempering °C after quenching
|
100
|
200
|
300
|
400
|
450
|
500
|
550
|
600
|
650
|
|
in Oil - HRC
|
56
|
54
|
52
|
49
|
47
|
46
|
43
|
38
|
34
|
|
in Air - HRC
|
54
|
52
|
50
|
47
|
45
|
43
|
40
|
36
|
32
|
Depending on stock material availability