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Tolerances to BS EN 10258 for cold rolled narrow stainless steel strip

Tolerances to BS EN 10258 for cold rolled narrow stainless steel strip

General

EN 10258 applies only to:

  1. Cold rolled narrow strip which is defined as having a rolled width of < 600 mm
  2. Coils slit from such narrow strip
  3. Cut lengths obtained from cold rolled narrow strip
  4. Maximum thickness of 3.00 mm

A range of special tolerances are provided for on thickness, width, length, flatness and edge camber.

Thickness tolerance

Tolerances are defined as Normal, Fine (F) or Precision (P). If the tolerance type is not specifically mentioned at the time of enquiry or order the Normal tolerance shall apply.

Tolerances on nominal thickness1)
Nominal Width (w) w < 125 125 < w < 250 250 < w < 600
Nominal Thickness (t) Normal Fine (F) Precision(P) Normal Fine (F) Precision(P) Normal Fine (F) Precision(P)
Equal to and over Less than
0.052) 0.10 ±0.10t ±0.06t ±0.04t ±0.12t ±0.10t ±0.08t ±0.15t ±0.10t ±0.08t
0.10 0.15 ± 0.010 ±0.008 ±0.006 ±0.015 ±0.012 ±0.008 ±0.020 ±0.015 ±0.010
0.15 0.20 ±0.015 ±0.010 ±0.008 ±0.020 ±0.012 ±0.010 ±0.025 ±0.015 ±0.012
0.20 0.25 ±0.015 ±0.012 ±0.008 ±0.020 ±0.015 ±0.010 ±0.025 ±0.020 ±0.012
0.25 0.30 ±0.017 ±0.012 ±0.009 ±0.025 ±0.015 ±0.012 ±0.030 ±0.020 ±0.015
0.30 0.40 ±0.020 ±0.015 ±0.010 ±0.025 ±0.020 ±0.012 ±0.030 ±0.025 ±0.015
0.40 0.50 ±0.025 ±0.020 ±0.012 ±0.030 ±0.020 ±0.015 ±0.035 ±0.025 ±0.018
0.50 0.60 ±0.030 ±0.020 ±0.014 ±0.030 ±0.025 ±0.015 ±0.040 ±0.030 ±0.020
0.60 0.80 ±0.030 ±0.025 ±0.015 ±0.035 ±0.030 ±0.018 ±0.040 ±0.035 ±0.025
0.80 1.00 ±0.030 ±0.025 ±0.018 ±0.040 ±0.030 ±0.020 ±0.050 ±0.035 ±0.025
1.00 1.20 ±0.035 ±0.030 ±0.020 ±0.045 ±0.035 ±0.025 ±0.050 ±0.040 ±0.030
1.20 1.50 ±0.040 ±0.030 ±0.020 ±0.050 ±0.035 ±0.025 ±0.060 ±0.045 ±0.030
1.50 2.00 ±0.050 ±0.035 ±0.025 ±0.060 ±0.040 ±0.030 ±0.070 ±0.050 ±0.035
2.00 2.50 ±0.050 ±0.035 ±0.025 ±0.070 ±0.045 ±0.030 ±0.080 ±0.060 ±0.040
2.50 3.003) ±0.060 ±0.045 ±0.030 ±0.070 ±0.050 ±0.035 ±0.090 ±0.070 ±0.045
  1. By agreement, the tolerances may be alternatively totally '+' or totally '-' or unevenly distributed around the nominal thickness. In any case, the total tolerance shall be as in the above table.
  2. For thicknesses below 0.05mm, the values for the tolerances are to be agreed at the time of the enquiry and order
  3. Including 3.00 mm

Width Tolerance

Tolerances on nominal width
Nominal Thickness (t) Nominal Width (w)
Equal to and over Less than < 40 40 < w < 125 125 < w < 250 250 < w < 600
Normal Fine (F) Precision (P) Normal Fine (F) Precision (P) Normal Fine (F) Precision (P) Normal Fine (F) Precision (P)
--- 0.25 +0.17/-0 +0.17/-0 +0.10/-0 +0.20/-0 +0.15/-0 +0.12/-0 +0.25/-0 +0.20/-0 +0.15/-0 +0.50/-0 +0.50/-0 +0.40/-0
0.25 0.50 +0.20/-0 +0.15/-0 +0.12/-0 +0.25/-0 +0.20/-0 +0.15/-0 +0.30/-0 +0.22/-0 +0.17/-0 +0.60/-0 +0.50/0 +0.40/-0
0.50 1.00 +0.25/-0 +0.20/-0 +0.15/-0 +0.25/-0 +0.22/-0 +0.17/-0 +0.40/-0 +0.25/-0 +0.20/-0 +0.70/-0 +0.60/-0 +0.50/-0
1.00 1.50 +0.25/-0 +0.22/-0 +0.15/-0 +0.30/-0 +0.25/-0 +0.17/-0 +0.50/-0 +0.30/-0 +0.22/-0 +1.0/-0 +0.70/-0 +0.60/-0
1.50 2.50 --- --- --- +0.40/-0 +0.25/-0 +0.20/-0 +0.60/-0 +0.40/-0 +0.25/-0 +1.0/-0 +0.80/-0 +0.60/-0
2.50 3.00 --- --- --- +0.50/-0 +0.3/-0 +0.25/-0 +0.6/-0 +0.40/-0 +0.25/-0 +1.2/-0 +1.0/-0 +0.80/-0
  1. By agreement, the tolerances may be alternatively totally '+' or totally '-' or unevenly distributed around the nominal thickness. In any case, the total tolerance shall be as in the above table.
  2. Including 3.00 mm

Tolerances on length

Tolerances on nominal length
Nominal Length (L) Tolerances
Normal Special (S)
< 2000 +3.00/-0 +1.50/-0
2000 < L < 4000 +5.00/-0 +2.00/-0

Flatness tolerance

The flatness tolerance of cut lengths shall not exceed 10mm for normal cases and 7mm where a special tolerance (FS) is required. This requirement does not apply to material supplied in the work hardened condition.

Edge waviness tolerance

For skin passed or stretch levelled strip the waviness of the edges shall be 0.03 for nominal thicknesses up to and including 1.00 mm and 0.02 for nominal thicknesses over 1.00, where waviness is defined as:

h/L where h is the wave height and L is the length over which the height is measured.

Out of squareness

The out of squareness of cut lengths in widths of 250mm and above shall not exceed 0.5% of the actual width of the product.

For cut lengths in widths of less than 250mm, the value is to be agreed at the time of enquiry and order.

Out of squareness is measured as in the diagram below:

 

Tolerance on edge camber

These shall be as in the table below:

Tolerances on edge camber
Specified width Edge camber tolerances
Equal to and over Less than Normal Restricted (R)
Measuring length Measuring length
1000 2000 1000 2000
10 25 4 16 1.5 6
25 40 3 12 1.25 5
40 125 2 8 1.0 4
125 600 1.5 6 0.75 3

Edge camber is the greatest deviation of a side edge from a straight line, the measurement being taken on the concave side with a straight edge as shown in the diagram below:

 

Modulo1

 

Modulo3

 

Modulo2

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