Since the early years in the 20th century, Berndorf Band has been manufacturing endless steel belts. These belts are made of stainless steel, carbon steel or titanium.
Berndorf Band special steel belts are used as high precision machine components for processing purposes or as conveyor belts.
Physical and mechanical properties
| Material | NICRO 12.1 | NICRO 22 | NICRO 22V | NICRO 31 | NICRO 52 | NICRO 52.6 | NICRO 62.5 | CARBO 13 | CARBO 24 | CARBO 32 | TITANIUM | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | CrNi 17 7 |
CrNiMo 17 12 2 |
CrNiMo 17 12 2 |
CrNiTi 13 4 |
CrNiCuTi 15 7 |
CrNiCuTi 15 7 |
CrNiCu 15 5 |
Ck 67 |
- |
- |
Grade 2 |
|
| Similar material | DIN | 1.4310 |
1.4401 |
1.4401 |
1.4313 |
- |
- |
- |
1.1231 |
- |
- |
3.7035 |
| AISI | 301 |
316 |
316 |
- |
- |
- |
- |
- |
- |
- |
- |
|
| Tensile strength | RT N/mm² | 1150 |
1100 |
1130 |
1080 |
1150 |
1550 |
1450 |
1200 |
1420 |
1280 |
390 |
| 0,2% yield offset strength | RT N/mm² | 950 |
970 |
1000 |
1050 |
1100 |
1500 |
1410 |
970 |
1320 |
1220 |
275 |
| Hardness | Rockwell HRC | 37.0 |
33.0 |
33.0 |
33.5 |
37.0 |
47.5 |
46.0 |
36.0 |
44.5 |
42.0 |
- |
| Vickers HV 10 | 360 |
330 |
330 |
330 |
360 |
480 |
460 |
350 |
440 |
410 |
160 |
|
| Elongation 50 mm | % | 18 |
12 |
12 |
5 |
8 |
6 |
8 |
8 |
6 |
5 |
20 |
| Welding factor | 0.70 |
0.65 |
0.70 |
0.95 |
0.95 |
0.80 |
0.75 |
0.80 |
0.75 |
0.80 |
0.95 |
|
| Fatigue strength under reversed bending stress *) |
RT N/mm² | 480 |
440 |
440 |
480 |
500 |
700 |
650 |
450 |
550 |
550 |
250 |
| Modulus in elasticity | 20°C N/mm² | 200,000 |
200,000 |
200,000 |
205,000 |
200,000 |
200,000 |
200,000 |
210,000 |
210,000 |
205,000 |
106,000 |
| 200°C N/mm² | 180,000 |
180,000 |
180,000 |
- |
- |
- |
- |
- |
- |
- |
- |
|
| Density | kg/dm3 | 7.90 |
7.95 |
7.95 |
7.70 |
7.74 |
7.74 |
7.80 |
7.85 |
7.85 |
7.82 |
4.53 |
| Mean thermal expansion coefficient |
20-100°C 10-6m/m°C | 16.0 |
16.5 |
16.5 |
10.8 |
10.9 |
10.9 |
10.8 |
11.1 |
12.0 |
11.8 |
8.5 |
| 20-200°C 10-6m/m°C | 17.0 |
17.5 |
17.5 |
11.2 |
11.5 |
11.5 |
10.8 |
11.9 |
12.5 |
12.4 |
8.9 |
|
| 20-300°C 10-6m/m°C | - |
- |
- |
11.7 |
11.7 |
11.7 |
11.3 |
12.5 |
12.9 |
12.6 |
- |
|
| 20-400°C 10-6m/m°C | - |
- |
- |
- |
- |
- |
- |
12.9 |
- |
- |
- |
|
| Specific heat | J/g°C | 0.50 |
0.50 |
0.50 |
0.46 |
0.50 |
0.50 |
0.42 |
0.46 |
0.45 |
0.46 |
0.52 |
| Thermal conductivity | 20°C W/m°C | 15 |
15 |
15 |
21 |
16 |
16 |
16 |
46 |
40 |
38 |
20 |
| Specific electric resistance | 20°C 0hm mm/m² | 0.73 |
0.75 |
0.75 |
0.60 |
0.80 |
0.80 |
0.77 |
0.13 |
0.20 |
0.20 |
0.78 |
| Max. permissible operating temperature |
°C | 250 |
250 |
250 |
350 |
350 |
350 |
300 |
400 |
250 |
350 |
250 |
| °F | 480 |
480 |
480 |
660 |
660 |
660 |
572 |
750 |
480 |
660 |
480 |
|
| Tensile strength at max. permissible operating temp. |
N/mm² | 940 |
870 |
900 |
970 |
900 |
1250 |
1160 |
850 |
1300 |
1100 |
225 |
| 0,2% yield offset strength at max. permissible oper. temp. |
N/mm² | 770 |
770 |
800 |
930 |
830 |
1180 |
1130 |
720 |
1100 |
1050 |
135 |
Flatness
max. relation h:l at belt tension of 10 N/mm²
| Longitudinal welding |
V rope | NICRO12.1 NICRO22 NICRO22V |
NICRO31 NICRO52 |
NICRO52.6 NICRO62.5 |
CARBO13 | TITAN |
|---|---|---|---|---|---|---|
without |
without |
1:350* |
1:350* |
1:200 |
1:350** |
1:350* |
without |
with |
1:200 |
1:350* |
1:200 |
1:350* |
1:350* |
with |
without |
1:250 |
1:250 |
1:200 |
1:250** |
- |
with |
with |
1:200 |
1:250 |
1:200 |
1:250** |
- |
Perforated |
1:200 |
1:200 |
1:200 |
1:200 |
- |
|
(*) 1:250、(**) 1:200 In the cross-welding zone
Tolerances
Special agreements are possible.
Straightrunning: 2/10000 of belt length
Surfaces
Standard surfaces
1.mill finished
Surface finish in accordance with process llla per DIN 17441 or 2B of ASTM resp. DIN 1624.
Smooth and clean, metallically clean, minor surface defects are admissible.
2.ground
3.polished
Roughness values (approx. values) for ground and polished surfaces
| Denomination | ground | polished | |||
|---|---|---|---|---|---|
| G-2.5 | G-0.63 | P-GW 0.3 | P-GW 0.12 | P-C | |
| Rt (μm) | 4.0 |
1.0 |
0.4 |
0.16 |
0.063 |
| Rz (μm) | 2.5 |
0.63 |
0.3 |
0.12 |
0.05 |
| Ra (μm) | 0.4 |
0.08 |
0.04 |
0.02 |
0.007 |
| Appropriate materials | NICRO 12.1
NICRO 22V
NICRO 31
NICRO 52
NICRO 52.6
NICRO 62.5 |
NICRO 12.1
NICRO 22V |
NICRO 22V |
||
Rt：roughness total or maximum peak to valley height
Rz：roughness total average
Ra：arithmetical average or center line average
Special finishes
Other types available upon request
- dark tempered
- sand blasted
- chrome plated
- teflon coated
- embossed
- perforated
- grooved
Preparation of belt ends
open
The BERNDORF belt is precut and delivered with an excess length of about 400mm, at least. The belt has to be cut to precise finish length when being installed into the equipment(angle of cut about 90°to the belt edge).
prepared for riveting
The BERNDORF belt is delivered in open condition.
Belt ends are in a ready-to-be-riveted condition.
prepared for welding
The BERNDORF belt is delivered in open condition.
Belt ends are prepared for welding
Angle of cut:
NICRO 80°to the belt edge
CARBO 90°to the belt edge
TITAN 80°to the belt edge
Endless Joints
1.Welded joints
Welded at our works
Angle of cut:
NICRO 80°to the belt edge
CARBO 90°to the belt edge
TITAN 80°to the belt edge
・Welded or riveted on site when belt is installed
(see preparation of the belt ends)
In the case of mill finished BERNDORF belts the welding seam is smoothed down flat on both sides by grinding.
In case of BERNDORF belts with surface treatment, the welding seam presents the same surface appearance outside as the parent material.
2.Rivet joints
Flat head brazier-type rivets
・For belt thickness of 0.6mm:
Rivet diameter 2.7mm, on demand 4.8mm
Distance of rivets 15mm
・For belt thickness of more than 0.6mm:
Rivet diameter 4.8mm
Distance of rivets 25mm
Other preparations upon demand
Berndorf Belt: Standard Dimensions
Material |
NICRO 12.1 | NICRO 22 | NICRO 22V | NICRO 31 | NICRO 52.6 | NICRO 62.5 | CARBO 13 | CARBO 24 | CARBO 32 | TITANIUM | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Thickness(mm) | Width(mm) without longitudinal welding seam |
Width(mm) with longitudinal welding seam |
||||||||||
0.6 |
200 |
○ |
||||||||||
400 |
○ |
○ |
||||||||||
600 |
○ |
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800 |
○ |
|||||||||||
1000 |
||||||||||||
1200 |
||||||||||||
0.8 |
500 |
○ |
○ |
|||||||||
600 |
○ |
○ |
○ |
○ |
||||||||
800 |
○ |
○ |
||||||||||
1000 |
○ |
○ |
○ |
|||||||||
1200 |
○ |
○ |
○ |
|||||||||
1.0 |
800 |
○ |
○ |
○ |
||||||||
1000 |
○ |
○ |
○ |
|||||||||
1200 |
○ |
○ |
○ |
○ |
○ |
○ |
||||||
1500 |
○ |
○ |
○ |
○ |
○ |
|||||||
1.2 |
800 |
○ |
○ |
○ |
||||||||
1000 |
○ |
○ |
○ |
|||||||||
1200 |
2400 |
○ |
○ |
○ |
○ |
|||||||
1500 |
3000 |
○ |
○ |
○ |
○ |
○ |
||||||
1.4 |
1200 |
3000 |
○ |
○ |
||||||||
1.5 |
1500 |
○ |
||||||||||
2000 |
○ |
|||||||||||
1.55 |
1200 |
2400 |
○ |
|||||||||
1500 |
3000 |
○ |
||||||||||
1.8 |
1500 |
3000 |
○ |
|||||||||
2.0 |
1200 |
2400 |
○ |
○ |
||||||||
1500 |
3000 |
○ |
○ |
○ |
||||||||
2000 |
○ |
|||||||||||
2.3 |
1200 |
2400 |
○ |
|||||||||
1500 |
3000 |
○ |
○ |
|||||||||
2.7 |
1500 |
3000 |
○ |
○ |
||||||||
3.0 |
1500 |
3000 |
○ |
○ |
||||||||
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*Max. width 5,600mm is available. But this is not a standard dimension and it is depending on suface, thickness, material, etc...
