Steel for forming
Our cold-rolled forming steels are available in a wide range of grades and corrosion-resistant coatings.
Each grade is designed for specific applications and comes with a choice of surface quality. Extensive dimensional choice provides opportunities for cutting waste and maximising yield.
MagiZinc® improves corrosion resistance with half the thickness of conventional zinc coatings, increasing yield, reducing cost and facilitating stronger, lighter products. It offers improved automotive corrosion protection and higher process efficiency.
Applications
- Automotive components
- Building components
- Domestic appliances
- Drain pipes
- Electrical goods
- Tubes and sections
EN-Automotive-Product-Metallic coated-Forming-DX51D-GI/GA/ZM TSE
EN-Automotive-Product-Metallic coated-Forming-All Grades OverviewTSE
Relationship with standards
| Grade |
VDA standard VDA 239-100-16 |
European standard EN 10346: 2015 |
|---|---|---|
| DX51-GI/GA/ZM | - |
DX51D+Z/+ZF/+ZM |
| DX52-GI/GA/ZM | CR1-GI/GA/ZM |
DX52D+Z/+ZF/+ZM |
| DX53-GI/GA/ZM | CR2-GI/GA/ZM |
DX53D+Z/+ZF/+ZM |
| DX54-GI/GA/ZM | CR3-GI/GA/ZM |
DX54D+Z/+ZF/+ZM |
| DX56-GI/GA/ZM | CR4-GI/GA/ZM |
DX56D+Z/+ZF/+ZM |
| DX57-GI/ZM | CR5-GI/ZM |
DX57D+Z/+ZM |
| DX58-GI 1 | - |
- |
1. Not in standard. Tata Steel’s own specification.
EN-Automotive-Product-Metallic coated-All Grades Coatings Surface aspectsTSE
Coatings
Three types of metallic coating are available:
- Pure zinc. Galvanised steel (GI) is coated with an almost pure zinc coating (>99% zinc)
- Zinc-iron alloy. Galvannealed steel (GA) is coated with a zinc coating containing approximately 8-12% iron
- MagiZinc Auto. MagiZinc Auto steel (ZM) is coated with a zinc coating containing additional magnesium and aluminium.
Coating weight
Coating | Minimum | Maximum |
|---|---|---|
| Pure zinc (Z) | 90 (6 µm/side) | 600 (42 µm/side) |
| Zinc-iron (ZF) | 90 (6 µm/side) | 140 (10 µm/side) |
| MagiZinc (ZM) | 70 (5 µm/side) | 200 (14 µm/side) |
Coating weight measured in g/m2 double-sided (µm, per side).
Surface condition
Surface condition complies with standard: EN 10346:2015. Galvanised steels are available in surface conditions with minimised spangle MB or MC. Galvannealed steels and MagiZinc Auto are available in surface conditions B or C.
Surface condition B: improved surface, suitable for unexposed parts
With this surface condition, small imperfections such as stretch levelling breaks, skin pass marks, slight scratches, indentations, surface structure, zinc run-off marks and light passivation stains are permissible.
Surface condition C: best quality surface, suitable for exposed parts
Surface condition C is obtained by skin passing. The controlled surface for the exposed side enables application of a uniform paint finish. The reverse surface has, at least, the characteristics of surface quality B.
Surface finish
Galvanised (GI) grades with surface condition MC are available with different levels of surface finish. For exposed body panels with stringent paint appearance requirements we offer ‘regular’ surface finish. For panels with the highest paint appearance requirements we recommend the premium surface finish Serica FLO®.
Surface roughness
Metallic coated steel for automotive applications can be supplied in various grades of roughness to comply with individual customer norms. If no roughness is specified, roughness will be as shown in the table below
| Roughness Ra (µm) | |
|---|---|
| cut off 0.8mm | cut off 2.5mm |
| 0.6 - 1.9 | 0.7 - 2.2 |
Surface treatments
The surface treatments available are oiling and T-treatment.
Oiling (O)
The material surface can be oiled with preservative oil. Other types of oil - for increasing strength or reducing weight – are available to help achieve your optimum performance parameters. Please contact us for details.
Tata Steel offers the following range of oiling levels:
| Coating type | Oiling level |
|---|---|
| Pure zinc (GI) | 0.25 - 1.5 g/m2 |
| Zinc-iron(GA) | 0.5 - 1.5 g/m2 |
| MagiZinc Auto(ZM) | 0.25 - 1.5 g/m2 |
Other oiling levels are available on request.
T-treatment
Please contact us for further information.
Prime Lubrication Treatment (PLT)
Prime Lubrication Treatment facilitates the manufacturing of stamped components by minimising known issues in stamping and joining.
For further information please visit our Prime Lubrication Treatment (PLT) page.
EN-Automotive-Product-Metallic coated-Forming-DX51D-PropertiesTSE
Properties
Mechanical properties
Metallic coated steel for forming has the following mechanical properties. These are measured transverse to the rolling direction.
Property range is indicated according to EN 10346, but properties meet equivalent VDA 239-100 specifications also.
| Grade | DX51-GI/GA/ZM | |
|---|---|---|
| Yield strength Re | N/mm² | - |
| Tensile strength Rm | N/mm² | 270 - 500 |
| Elongation | % | 22 |
| Min. r-value | - | |
| Min. n-value | - |
If the yield point is not pronounced, the values apply to the 0.2% - proof strength Rp0.2 ; if the yield strength is pronounced, the values apply to the lower yield point ReL.
Decreased minimum elongation values apply for product thickness t ≤ 0.50mm (minus 4 units) and for 0.50mm ≤ t ≤ 0.70mm (minus 2 units).
Elongation after fracture A uses test piece length L0 = 80 mm.
Chemical composition
Tata Steel complies with the following cast analysis:
| Grade | DX51 | |
|---|---|---|
| C | Max. | 0.18 |
| Mn | Max. | 1.20 |
| P | Max. | 0.12 |
| S | Max. | 0.045 |
| Al | Min. | - |
| N | Max. | - |
| Ti | Max. | 0.30 |
All values in weight%.
EN-Automotive-Product-Metallic coated-Forming-DX51D-DimensionsTSE
Dimensional capability
Galvanised (GI) products
Dimensions in mm.
| Thickness | Max. width |
|---|---|
| From - up to | DX51 |
| 0.40 - 0.55 | 1520 |
| 0.55 - 0.60 | 1600 |
| 0.60 - 0.65 | 1770 |
| 0.65 - 0.70 | 1870 |
| 0.70 - 0.75 | 1890 |
| 0.75 - 0.80 | 1990 |
| 0.80 - 2.00 | 2000 |
| 2.00 - 2.50 | 1550 |
| 2.50 - 3.50 | 1540 |
| 3.50 - 3.60 | 1500 |
| 3.60 - 3.70 | 1450 |
| 3.70 - 3.85 | 1400 |
| 3.85 - 4.00 | 1350 |
For widths below 900 mm, please contact us.
Galvannealed (GA) products
Dimension