These coils are heavily over coated on a section of about 2-5 m of its length. In addition there is a risk that the zinc coating may peel off in approx 100 m of the length of the coil (close to the over coated part) . This section of the coil usually presents a darker color and is easy to identify most of the times. You may see the defect from the side of the coil.

This defect occurs when the coating process has been stopped for a short period. During the pause, 2-5 m of the length is dipped in the melted zinc while approx 100 m of the coil length is in the oven. The severity of the defect depends on the duration of the pause: the longer the pause, the more serious the defect of the overheated part. The average time of the pause is between 1 - 20 minutes.  Some few coils could have more than one “line stop defect”. These coils are not very good for slitting due to the defect. Cut to length is usually a better use for these coils, as you may discard the damaged section.

One side of the coil is build up in the shape of a bell and therefore is called "bell end coil". Sometimes it is not possible to see the defect from the outside, but it becomes apparent when slitting or cutting the coil.

The defective part is usually located from 50 to100 mm from one of the sides of the sheet. The wavy defect is larger in the first laps of the coils and than less and less to be almost free from defects in the end.

When slitting, it is important to count with approx 50 mm scrap in average on one side (this part is usually not possible to use for anything else than scrap). When cutting to sheets, one side will be wavy and not flat.

There are some small creases present across some portions of the width of the coil, although seldom throughout the entire coil. The creases take place with approx 1 m in between. They are usually small and difficult to see from outside of the coil. They become more evident when the coil has been cut to sheets.

The defect is not serious if the coil is to be slit or cut to small sheets/pieces, but for larger sheets the defect is more obvious. The visual flaw is even more noticeable if these large sheets are to be painted afterwards.

The coils with this defect have stripes or scratches along its length; usually 1-5 long scratches beside one another. Their depth is normally of approx 0.1 mm.

These marks are sometimes visible from the outside and affect in average half of the coil. The stripes are usually only a visual defect in the coating and do not effect the zinc protection.

The coils with this defect usually present small spots/pine holes without zinc coating. The spots have a diameter of 1 to 3 mm.

They are located in groups and not throughout the entire coil. Several hundred meters of it might be problem-free. It is often impossible to see the defect from outside of the coil.

The coils with this defect have usually small spots/pine holes with a diameter of 10 to 30 mm. These spots are covered by a defective zinc coat.

The spots are not present throughout the entire length of the coil. They are concentrated in a few groups. It is usually impossible to see the defect from outside of the coil.

The coils with this defect have small zinc clumps and little over coating on the edge of the sheets. The imperfection is on average located not more than 5 – 10 mm in from the edges. The protection of the zinc coating is not effected.

This denomination indicates that small grains of zinc burls can be present on the surface of the product.

The surface may feel on some few places like sand paper as a consequence of the zinc burls. The defect does not compromise the zinc protection of the coils/sheets.

The worst case scenario for these coils is that the coating can partly peel off during a sharp bending and/or a deep drawing of the steel.

For more light bended and treated final products, this defect is usually not a problem. However, Norex does not guarantee the performance of the coil.

Affected coils usually show spots of dark grey color instead of red/white rust. This problem arises as a consequence of air condensation, that is, when light water spots form on the coils as a consequence of important changes in temperature in the storage facility or during transport.

Normally it is not possible to see this defect from the outside of the coil. This is a visual defect and does not usually effect the coating protection.

The coils that present this defect have been protected with too much chromate oil in some areas. The imperfect part usually presents a characteristic yellow color and is sometimes a bit sticky.

The defect is visual only and does not effect the protection of the coating. In some cases it is possible to see the flaw from the outside of the coil, although not always.

The coil is not protected by chromate or oil and therefore the risk of rust is higher. The coils are not rusty when arriving or leaving Norex (if rust is present this is indicated in the column "remarks"). These coils are usually purchased for onward painting.