Steel for forming
Cold-rolled steel for cold forming and deep drawing is available in a range of grades. Each grade is designed for particular applications – allowing you to pick the best steel for your product.
Our forming steel is available in a choice of widths up to 2050mm and thicknesses up to 3 mm. This provides opportunities for cutting waste and maximising yield. These products are made using one of two process routes:
continuous annealing (CA)
batch annealing (BA)
Applications
- Automotive components and body panels
- Components for building
- Domestic appliances
- Electrical goods
- Furniture
- Radiators
- Tubes
EN-Automotive-Product-Cold-rolled-Forming-DC01 TSE
EN-Automotive-Product-Cold-rolled-Forming-All Grades OverviewTSE
Our forming steel is available in a choice of widths up to 2050mm and thicknesses up to 3.1mm. This provides opportunities for cutting waste and maximising yield.These products are made using one of two process routes:
- continuous annealing (CA)
- batch annealing (BA)
Applications
Automotive components and body panels
Relationship with standards
Cold-rolled steel for forming complies with European standard EN 10130: 2006 and is available in the grades shown below.
| European standard | VDA |
|---|---|
| EN 10130: 2006 | VDA 239-100-16 |
| Grade | Grade |
| DC01 | CR1 |
| DC03 | CR2 |
| DC04 | CR3 |
| DC05 | CR4 |
| DC06 | CR5 |
Table indicates most comparable grades across standards; these are not necessarily equivalent grades.
EN-EngineeringAutomotive-Product-Cold-rolled-All Grades Surface aspectsTSE
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-Engineering-Product-Cold-rolled-Forming-DC01-Properties TSE
Properties
Mechanical properties
Cold-rolled steel for forming has the following mechanical properties (skin-passed) - these are measured transverse to the rolling direction:
| EN 10130: 2006 | Grade | DC01 |
|---|---|---|
| Max. yield strength Re 1,2,6 | N/mm2 | 280 |
| Tensile strength Rm | N/mm2 | 270 - 410 |
| Elongation 3 | % | 28 |
| r90-value 4,5 | - | |
| n90-value 4 | - |
1. The values of the yield strength are those of the 0.2% yield strength for products with no definite yield point and the lower yield strength ReL for the other products.
2. For thicknesses > 0.5 mm and ≤ 0.7 mm, the value for yield strength is increased by 20 N/mm2.
For thicknesses ≤ 0.5 mm, the value is increased by 40 N/mm2.
3. For thicknesses > 0.5 mm and ≤ 0.7 mm the minimum elongation after fracture is decreased by 2%. For thicknesses ≤ 0.5 mm the minimum elongation after fracture is decreased by 4%.
Elongation after fracture A uses test piece length L0 = 80 mm.
4. The r- and n- values apply to a thickness of t ≥ 0.5 mm.
5. For a thickness of t > 2 mm, the r90 value or r-average value is decreased by 0.2.
6. For design purposes, a lower yield strength ReL of at least 140 N/mm2 can be assumed.
Chemical composition
Cold-rolled steel for forming supplied by Tata Steel comply to the following cast analysis:
| EN 10130: 2006 | Grade | DC01 |
|---|---|---|
| C | Max. | 0.12 |
| Mn | Max. | 0.60 |
| P | Max. | 0.045 |
| S | Max. | 0.045 |
All values are in weight%.
EN-Engineering-Product-Cold-rolled-Forming-DC01-Dimensions TSE
Dimensional capability - Continuously annealed (CA)
Dimensions in mm.
| Thickness | Max. width |
|---|---|
| From - up to | DC01 |
| 0.37 - 0.45 | 1390 |
| 0.45 - 0.50 | 1470 |
| 0.50 - 0.60 | 1550 |
| 0.60 - 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 - 1.95 | 1520 |
| 1.95 - 2.00 | 1500 |
Minimum width is 900 mm for thicknesses below 0.5 mm.
Minimum width is 825 mm for all other thicknesses.
Dimensional capability – Batch annealed (BA)
Dimensions in mm.