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S280GD+Z/+ZM
Specification details for S280GD+Z/+ZM

EN-Engineering-Product-Metallic coated-All Grades Coatings Surface aspectsTSE

Coatings and surface aspects

Coatings

Three types of metallic coating are available:

Pure zinc

Galvanised steel (+Z) is coated with an almost pure zinc coating (>99% zinc).

Zinc-iron alloy

Galvannealed steel (+ZF) is coated with a zinc coating containing approximately 8-12% iron. 
For further information on our galvannealed products please visit our Automotive catalogue.

MagiZinc

MagiZinc 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)1 70 (5 µm/side) 310 (22 µm/side)
Coating weight measured in g/m2 double-sided (µm, per side).
Coils with coatings > 450 g/m2 will be supplied in oscillated coiled condition.
Coils coated with 600 g/m2 are only available in width range 980 to 1300 mm.
1 For MagiZinc (ZM) coating weights below 100 g/m2 please visit our Automotive catalogue. 
 

Surface quality

Surface quality complies with standard: EN 10346:2015. Galvanised steels are available in surface quality A, B or C.
For the highest surface quality requirements we also offer Serica FLO®. For more details please visit our Automotive catalogue.

Surface quality A: as coated surface

Imperfections such as pimples, marks, scratches, pits, variations in surface appearance, dark spots, stripe marks and light passivation stains are permissible.
Stretch levelling breaks or run-off marks may appear. Coil breaks and stretcher strains may also appear.

Surface quality B: improved surface

With this surface quality, 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 quality C: best quality surface

For more information on surface quality C please visit our Automotive catalogue.

 

Surface finish

Pure zinc

MA: minimised spangle, as coated surface (Z).
MB: minimised spangle, improved surface (Z).
MC: minimised spangle, best quality surface (Z).

Zinc-iron alloy

A: as coated surface (ZF).
B: improved surface (ZF).
C: best quality surface (ZF).

MagiZinc®

A : as coated surface (ZM).
B : improved surface (ZM).
C: best quality surface (ZM).

 

Surface roughness

Metallic coated steel (with the exception of galvanised steel with standard surface (MA)) can be supplied in various grades of roughness – please contact us for more details. 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 O, C and CO.

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

Capability

Pure zinc (Z)

0.25 - 1.5 g/m2

Zinc-iron (ZF)

0.5 - 1.5 g/m2

MagiZinc® (ZM)

0.25 - 1.5 g/m2

Other oiling levels are available on request.

Chromium-free passivation (C)

This surface treatment temporarily protects the zinc-coated material against white rust during transportation and storage (not applicable to all qualities and dimensions – please contact us for details).

Chromium-free passivation and oiled (CO)

Please request this combination of surface treatments if you require extra protection against white rust formation (not applicable to all qualities and dimensions – please contact us for details).

Untreated (U)

Please contact us regarding the availability of untreated coils.

EN-Engineering-Product-Metallic Coated-Structural steel-S280GD-Properties TSE

Properties

Properties


Mechanical properties

Metallic coated structural steel grades have the following mechanical properties (skin-passed) - these are measured longitudinal to the rolling direction:

EN 10346: 2015 Grade S280GD+Z/+ZM
Min. yield strength Rp0.2 N/mm² 280
Min. tensile strength Rm N/mm² 360
Elongation % 18
If the yield point is pronounced, the values apply to the upper yield point ReH.
For all grades except S550GD+Z a range of 140 N/mm² can be expected for tensile strength.
Elongation after fracture uses test piece length L0 = 80 mm.
For a thickness t ≤ 0.7 mm the minimum elongation after fracture is decreased by 2% and for a thickness t ≤ 0.5mm the minimum elongation after fracture is decreased by 4%.
 

Chemical composition

Tata Steel supplies the following cast analysis with maximum values unless otherwise shown:

EN 10346: 2015 Grade S280GD+Z/+ZM
C Max. 0.20
Mn Max. 1.70
P Max. 0.10
S Max. 0.045
Si Max. 0.60
All values in weight%.

EN-Engineering-Product-Metallic Coated-Structural steel-S280GD-Dimensions TSE

Dimensions

Dimensional capability
 

Galvanised (+Z) products

Dimensions in mm.

Thickness Max. width
From - up to S280GD
0.40 - 0.50 1520
0.50 - 0.60 1580
0.60 - 0.70 1720
0.70 - 0.75 1800
0.75 - 0.90 1830
0.90 - 1.40 1850
1.40 - 1.60 1830
1.60 - 2.20 1550
2.20 - 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.
For thicknesses over 2.50 mm, the minimum width is 1000 mm.
 

MagiZinc® (+ZM) products

Dimensions in mm.

Thickness Max. width
From - up to S280GD
0.40 - 0.45 1520
0.45 - 0.50 1520
0.50 - 0.60 1520
0.60 - 0.75 1520
0.75 - 0.90 1550
0.90 - 1.60 1550
1.60 - 2.00 1550
For widths below 900 mm and thicknesses between 2.00 and 2.50 mm, please contact us.

 

Tolerances

Tolerances comply with standard EN 10143: 2006.
Tighter tolerances are available - please contact us for details.