EN 485-4-1993 pdf download.Aluminium and aluminium alloys — Sheet, strip and plate — Part 4: Tolerances on shape and dimensions for cold-rolled products.
This Part of EN 485 specifies the tolerances on shape and dimensions for wrought aluminium and aluminium alloy sheet, strip and plate obtained by cold-rolling, for general engineering applications. It applies to products with a thickness over 0,20 mm up to and including 50 mm.
It does not apply to semi-finished rolled products in coiled form to be subjected to further rolling (reroll stock) or to special products such as corrugated, embossed, etc. sheet and strip or to special applications such as aerospace, can stock, etc. which are dealt with in separate European Standards.
Technical conditions for inspection and delivery of products covered by this standard are specified in EN 485-1.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 485-1, Aluminium and aluminium alloys — Sheet, strip and plate — Part 1: Technical conditions for inspection and delivery.
EN 573-3, Aluminium and aluminium alloys
3.1 Thickness
3.1.1 For the purpose of this European Standard the alloys are distributed into two groups which correspond to varying difficulty when manufacturing the products. Tighter thickness tolerances apply to Group I alloys (soft alloys).
The grouping is carried out according to the specified chemical composition limits of the alloys (see EN 573.3) as follows:
— Group I alloys:
— 1 000 series alloys;
— non heat-treatable 7 000 and 8 000 series alloys;
— 4 000 series alloys with less than 2 % maximum specified silicon content;
— 3 000 and 5 000 series alloys for which the maximum specified magnesium and manganese contents are each no greater than 1,8 % and their sum no greater than 23 %.
— Group II alloys:
— all alloys which do not belong to Group I.
The split into Group I and Group II of the most commonly used general engineering alloys is given in annex A (see Table Al).
3.1.2 Thickness tolerances for sheet, strip and plate are specified in Table 1.
3.1.3 Other thickness tolerances may be agreed between supplier and purchaser. They are specified in annex B.
The deviation from straightness, d, is measured as indicated in Figure 1, for a length L of 2 000 mm. from one end of the strip, while the strip is resting on a horizontal base plate.
4.1.2 Lateral curvature tolerances for sheet and plate are specified in Table 6.
The deviation from straightness. d, is measured as indicated in Figure 1, while the sheet or plate is resting on a horizontal base plate.
4.2 Flatness
4.2.1 Flatness tolerances for strip are not specified.
4.2.2 Flatness tolerances for sheet and plate are
specified in Table 7 and are expressed as a
percentage of the length L and br the width W
and br the measured chord length 1.
Deviation from flatness, d, resulting from arching, buckling or edge waves, is measured as shown in Figure 2 to Figure 5, using a lightweight straightedge and a feeler gauge, dial gauge or scale, while the sheet or plate is resting on a horizontal base plate concave side upwards.
These tolerances do not apply to sheet and plate supplied in the 0 (annealed) or F (as fabricated) tempers or to bright sheet.
These tolerances do not include end or corner turn up.
4.3 Squareness
4.3.1 Squareness tolerances for strip are not specified.
4.3.2 Squareness tolerances for sheet and plate are specified in Table 8.
The squareness tolerance is expressed as the maximum allowable difference in length of diagonals AA and RB as shown in Figure 6.EN 485-4-1993 pdf download.