Dimensions of deliverables
- Thickness [mm]
- From 0.01 to 3.50
- Width [mm]
- From 2.00 to 300
Depending on the alloys, not all thickness/width combinations are available.
Minimum ratio: Width / Thickness = 4:1
Know-how and skills
Specifications and Tolerances
Thickness tolerances
| Strip thickness [mm] | Thickness tolerance [mm] | ||
|---|---|---|---|
| from | to | standard | special |
| 0.01 | 0.05 | ± 0.0025 | ± 0.001 |
| 0.05 | 0.10 | ± 0.004 | ± 0.0025 |
| 0.10 | 0.20 | ± 0.005 | ± 0.003 |
| 0.20 | 0.40 | ± 0.008 | ± 0.004 |
| 0.40 | 1.00 | ± 0.012 | ± 0.006 |
| 1.00 | 1.50 | ± 0.015 | ± 0.007 |
| 1.50 | 2.00 | ± 0.020 | ± 0.010 |
| 2.00 | 3.50 | ± 0.030 | ± 0.015 |
Thickness tolerances
| Strip width [mm] |
Width tolerance [mm] | |||
|---|---|---|---|---|
| from | to | standard | special | Extreme |
| 2 | 99 | 0.00 / +0.20 | ± 0.05 | ± 0.01 |
| 99 | 200 | 0.00 / +0.30 | ± 0.10 | ± 0.08 |
| 200 | 300 | 0.00 / +1.00 | 0.00 / +0.50 | 0.00 / +0.40 |
Quantity tolerances
| Quantities | Tolerances |
|---|---|
| up to 10 kg | +100% / -50% |
| 10 - 19 kg | ±50% |
| 20 - 49 kg | ±30% |
| 50 - 499 kg | ±20% |
| from 500 kg | ±10% |
Hardness
The hardness is measured in Vickers
The weight P used for the measurement is determined as per the watchmaking standard (NIHS 08-90)
The tightest possible tolerance for standard is ±10 HV
For low hardness range alloys, such as aluminium, then the tolerance can be reduced to ±5 HV
Type of edges
- Sharp slit edges
- Burr height to be specified
Surface condition
| Surface condition As per standard ISO 4288 | ||
|---|---|---|
| Standard Class B |
Improved Class E |
Mirror polish Class F |
| Ra 0.20 max. | Ra 0.07 max. | Ra 0.006 max.* |
| Rz 1.8 max. | Rz 0.50 max. | Rz 0.10 max. |
| Lt = 4.00 | Lt = 1.25 | Lt = 1.25 |
Robert Laminage surface condition
The surface condition inspection is highly strict, and defined by Ra Rz. We can focus in particular on meeting the most stringent requirements of the biggest watchmaking brands.
It takes into account changes in strip colour, light reflection, aesthetic texture of the surface, etc.
* Not measurable with a standard device
Delivery formats
In coils
In straightened strips
(0.050 to 3.00 m long)
In washers or cut discs
Packaging
| Possible internal diameter for coils | ||||
|---|---|---|---|---|
| 150 mm | 300 mm | 400 mm | 500 mm | 600 mm |
- With cardboard inner ring
- With plastic inner ring (return deposit)
- Special anti-rust conditioning
- The steels are conditioned with anti-rust oil
At your service
We provide every technical assistance, in:
- Selecting your alloy
- Defining its shape and characteristics
- Studying new developments
- Providing assistance to resolve your production problems
- Various metallographic analyses
"A material's internal structure is of capital importance."
Camber
| Strip width [mm] | Maximum camber [mm/m] | ||||
|---|---|---|---|---|---|
| Thickness < 0.5 mm | Thickness > 0.5 mm | ||||
| from | to | standard | special | standard | special |
| 3 | 6 | 8,00 | 1,00 | 8,00 | 2,00 |
| 6 | 10 | 6,00 | 1,00 | 6,00 | 2,00 |
| 10 | 20 | 4,00 | 1,00 | 3,00 | 1,00 |
| 20 | 350 | 3,00 | 1,00 | 3,00 | 1,00 |
Waviness
| Strip thickness [mm] | Waviness height H 50 mm specimen [mm] | ||
|---|---|---|---|
| from | to | standard | special |
| 0.10 | 0.20 | 0.02 | 0.005 |
| 0.20 | 0.50 | 0.02 | 0.006 |
| 0.50 | 1.00 | 0.03 | 0.008 |
| 1.00 | 3.50 | 0.03 | 0.02 |
Flatness
| Strip thickness [mm] | Curling height P Measured on the strip width [mm] | ||
|---|---|---|---|
| from | to | standard | special |
| 0.10 | 0.20 | 0.03 | 0.005 |
| 0.20 | 0.50 | 0.03 | 0.006 |
| 0.50 | 1.00 | 0.03 | 0.008 |
| 1.00 | 3.50 | 0.03 | 0.02 |
Coil set
| Strip thickness [mm] | Coil set G [mm] | ||
|---|---|---|---|
| from | to | standard | special |
| 0,10 | 0,20 | 5 | 2 |
| 0,20 | 0,50 | 10 | 3 |
| 0,50 | 1,00 | 20 | 5 |
| 1,00 | 3,50 | 30 | 10 |
The coil set defect is directly related to the strip's coiling diameter. So the specimen must be taken from a straightened coil. The more the strip is coiled over a large-diameter ring, the less the residual curve effect will be.
We should note that with time (1-2 weeks), the material adopts the coil shape, so the strip needs to be re-straightened upon the start of production.
