Surface quality complies with standards EN 10327 and EN 10326.

The products can be delivered with surface quality A, B or C. 

• Surface quality A: standard surface

          Imperfections such as small pits, differences in spangle size, dark spots, stripes

          and light passivation from the chemical treatment are permissible.

• Surface quality B: improved surface

          The B quality surface is obtained by skin passing.
          To a small extent imperfections are permissible, such as stretch levelling breaks,

          skin pass marks, scratches, indentations, spangle structure, zinc run-off marks

          and light passivation from chemical treatment. The surface has no pits.

• Surface quality C: best quality surface

          The C quality surface is obtained by skin passing.
          The better side is suitable for the uniform appearance of a high quality paint finish.

          The other side must at least conform to the characteristics for surface quality B.

As a rule, the coil is wound so that the inspected surface is facing outwards.

On request the strip can be coiled with the inspected surface facing inwards.

The products can be delivered with zinc layer M or R. 

Coating type	Coating designation	Coating finish and surface quality
Zinc (Z)	Galvanised (GI)	MA, MB, MC	Minimized spangle
Zinc-iron alloy (ZF)	Galvannealed (GA)	RA, RB, RC	-

Weight of the coating (double-sided) and thickness of the zink layer (single-sided):

Other coating weights are available after consultation.

Metallic coated steel - with the exception of galvanised steel with standard surface (MA) - can be obtained in different grades of roughness. If no roughness is specified, normal is delivered.

Tata Steel Strip Products IJmuiden classifies as follows:

Description	Roughness Ra (µm)	Roughness Ra (µm)
	cut off 2.5 mm	cut off 0.8 mm
normal	0.9 - 1.5	0.75 - 1.25
rough	1.2 - 1.8	1.00 - 1.55

 

The products can be delivered with surface protection O, C and CO.

Oils (O)

The material surface can be oiled with preservative oil. Other types of oil are available on request. 

Normally Tata Steel Strip Products IJmuiden supplies from 0.25 g/m² up to 1.0 g/m² per side. 

If no amount is indicated in the specification, a normal amount of 1.0 g/m² per side is used.

Chromium-free passivation (C)

This surface treatment temporarily protects the zinc-coated material against white rust during transportation and storage. (Not applicable for all qualities, please ask our representative).

Chromium-free passivation and oiled (CO)

Request this combination of surface treatments if you require extra protection against white rust formation. (Not applicable for all qualities, please ask our representative).

Untreated (U)

Tata Steel Strip Products IJmuiden does not offer untreated galvanised steel because of the risk of rust formation on unprotected material during storage or shipment.