EN-Product-Cold-rolled-All Grades Surface aspectsTSUK
Surface quality
Surface quality A
Defects that do not influence the formability or the application of surface coatings are permitted. They are defects such as pores, minor scratches, slight indentations, small grooves or slight discolouration.
Surface quality B
The better side must be free of defects that can spoil the uniform appearance of a high-quality paint or of an electrolytic coating. The other side must at least conform to surface quality A. Not all combinations of thickness and width are available in surface quality B. Please contact us for details.
Inspected side
As a rule, the upper side of the strip is inspected; on request, the strip can be wound so that the inspected side is the underside.
Surface texture/roughness
Cold-rolled annealed and skin-passed steel is available in several surface textures. Unless specified otherwise, Tata Steel will supply normal roughness. The table below shows the range of surface textures according to EN 10130:2006.
|
Roughness Ra (µm) |
|
---|---|---|
EN 10130: 2006 |
Symbol |
cut off 0.8 mm |
extra-bright 1 |
- |
≤ 0.3 |
bright |
b |
≤ 0.4 |
semi-bright |
g |
≤ 0.9 |
normal |
m |
0.6 - 1.9 |
rough |
r |
> 1.6 |
extra-rough 2 |
- |
3.5 - 5 |
1. Not in EN 10130:2006 - Tata Steel’s own specification. Please contact us regarding the availability
2. Not in EN 10130:2006 - Tata Steel’s own specification, measured with a cut off of 2.5 mm
Other surface textures are available to meet your requirements - please contact us for details.
Preservative oil
The standard oil applied by Tata Steel acts as a protective coating. Other types of oil may be available to meet your requirement.
Tata Steel offers a range of oiling levels from 0.25 - 1.7 g/m2 per side.
Other oiling levels are available on request. Tata Steel is not responsible for the risk of corrosion during storage or shipment if material is ordered in the un-oiled condition.
Surface cleanliness
Tata Steel can guarantee improved surface cleanliness on request for batch-annealed products. The cleanliness is tested with a tape test, in which the loss of reflection is measured. The reflection gives an indication of the oil residue on the annealed product. Two levels of loss of reflectivity are available for batch annealed products: a maximum of 20% or a maximum of 30%. Continuously-annealed products typically exhibit a loss of reflection up to around 10%.
EN-Product-Cold-rolled-Structural steel-CA200-Properties TSUK
Properties
Mechanical properties
Cold-rolled structural steel has the following mechanical properties (skin-passed) - these are measured transverse to the rolling direction:
Grade | CA200 | |
---|---|---|
Yield strength 1 | N/mm2 | 200 - 260 |
Tensile strength | N/mm2 | 320 - 380 |
Elongation | % | 30 |
1. Lower yield point or 0.2% proof stress applies.
Elongation after fracture A uses test piece length L0 = 80 mm.
There are no direct EN standard equivalents.
Chemical composition
Cast analysis in weight percentages:
Grade | CA200 | |
---|---|---|
C | Max. | 0.085 |
Mn | Max. | 0.55 |
P | Max. | 0.03 |
S | Max. | 0.03 |
Alsol | Min. - Max. | 0.015 - 0.080 |
1. These additional elements may be used individually or in combination where they appear in the definition of the steel within the composition limits indicated. Vanadium and boron may also be added. However, the sum of the contents of these four dispersoidal elements shall not exceed 0.22%.
All values are in weight%.
EN-Product-Cold-rolled-Structural steel-CA200-Dimensions TSUK
Dimensional capability - Continuously annealed (CA)
Dimensions in mm.
Thickness | Max. width |
---|---|
From - up to | CA200 |
0.37 - 0.45 | 1390 |
0.45 - 0.50 | 1470 |
0.50 - 0.60 | 1550 |
0.60 - 0.65 | 1600 |
0.65 - 0.75 | 1710 |
0.75 - 1.60 | 1820 |
1.60 - 1.70 | 1750 |
1.70 - 1.80 | 1650 |
1.80 - 1.90 | 1525 |
1.90 - 2.00 | 1500 |
Minimum width is 900 mm for thicknesses below 0.5mm.
Minimum width is 825 mm for all other thicknesses.
Tolerances
Tolerances comply with standard EN 10131: 2006.
Tighter tolerances are available, please contact us for details.
EN-Product-Cold-rolled-All grades Further processingTSUK
Further processing
We have a broad network of Tata Steel service centres across Europe, offering decoiling and slitting services from stock and against short lead times
Light gauge processing
Processing type | Slitting | Decoiling | Blanking |
---|---|---|---|
Thickness range (mm) | 0.2 - 7.0 | 0.3 - 6.0 | 0.3 - 6.0 |
Width range (mm) | 10 - 2050 | 50 - 2600 | 200 - 2600 |
Length range | - | up to 6m | up to 6m |
Locations | UK Ireland Netherlands Germany France Spain Sweden Norway Finland |
UK Ireland Netherlands Germany France Spain Sweden Norway Finland |
UK Netherlands |
For further information please visit our Service Centre webpages.