Tolerances

Tolerances for XLERPLATE® steel and XLERPLATE® steel floor plate

This section specifies the manufacturing tolerances for steel plate and floorplate over 4.5mm thick that has been hot rolled on a reversing mill. Unless otherwise indicated, tolerances apply to 100% of product supplied.

Edge camber tolerances

Edge camber will be limited to ensure that the dimensions of the ordered plate are within the delivered size. If agreed to at the time of ordering, edge camber will be limited to 0.2% of the actual length of the plate for a trimmed edge and 0.3% of the actual length of the plate for an untrimmed edge.

Out of square tolerances

For all sizes the cut lengths shall be such that plates conforming to the ordered nominal dimensions can be obtained.

Flatness tolerances

Tolerances for flatness vary with the nominal thickness of the product. Details are provided in AS/NZS1365 and shown over the page.

Tolerances for XLERPLATE LITE® steel

This section specifies the manufacturing tolerances for hot rolled steel plate, floorplate, sheet and strip rolled on a continuous mill in thicknesses up to 12mm and widths up to 1800mm. Unless otherwise indicated, tolerances apply to 100% of product supplied.

Edge camber tolerances

When measured in accordance with the procedure described previously, the maximum deviation of the side edge from a straight edge for hot rolled plate, strip, floorplate and sheet in all edge conditions will not exceed 0.4% of the actual length.

Out of square tolerances

For all sizes the cut lengths shall be such that sheets or plates conforming to the ordered nominal dimensions can be obtained. When measured in accordance with the procedure described previously, the out of squareness of a cut length from trimmed edge steel strip will not exceed 1.0%.

Flatness

To measure flatness, the product, resting under its own weight, is placed on a flat horizontal surface in such a manner that any deviation from flatness is in the centre, not at the ends.

Deviations from flatness are measured by allowing a straight edge to rest on at least two points on the product surface and then measuring the distance between the product and the straight edge. (Diagram A)

Only that portion between two consecutive points of contact is taken into consideration. The straight edge may be placed in any direction. Where two points of contact do not exist, the deviation may be determined by measuring the distance between the flat horizontal surface and the bottom surface of the product (Diagram B).

Steepness ratio

This is an alternative method for expressing flatness. The product resting under its own weight is placed on a flat horizontal surface with the depression to be measured facing upwards. The steepness ratio, expressed as a percentage, is calculated by determining the maximum distance between the product surface and straight edge in accordance with the procedures specified. (Illustrated in Diagram A and B), then applying the following equation:

Steepness ratio = H/L x 100%

where:

H = deviation from flatness (wave height) in millimetres

L = length of sheet between two points of contact, in millimetres

DIAGRAM A: Between two points of contact.

DIAGRAM B: Where two points of contact do not exist.

LEGEND:

H = deviation from flatness
W = width of sheet
L = length of sheet between two points of contact