Know-how and skills

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

Dimensions of deliverables

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

Dureté

Type of edges

  • Sharp slit edges
  • Burr height to be specified
Type of edges

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
 

En rouleaux

In straightened strips
(0.050 to 3.00 m long)

En bandes redressées

In washers or cut discs

En rondelles ou disques découpés

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."
 
At your service

Edgewise curvature

Strip width [mm] Maximum edgewise curvature [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
 Edgewise curvature

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
Waviness

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
Flatness

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.

Coil set

Contact us

Do not hesitate to contact us for a quote, any questions or advice. We will get back to you as soon as possible. 

Your request
Quote request
mm
mm
mm
mm
mm
mm
kg
HV
HV
Surface condition measurement
µm
µm
µm
µm
Coil diameter
mm
mm
mm
Packaging
EN10204 certificate