Tolerance to EN 10058 for Hot Rolled Flat Stainless Steel Bar
Tolerances for hot rolled stainless steel bars are included with the general standard for hot rolled steel bars. The various sections are covered by:
EN 10058 - Stainless Steel Flat bars
EN 10059 - Stainless Steel Square bars
EN 10060 - Stainless Steel Round bars
EN 10061 - Stainless Steel Hexagon bars
All of these can be used in conjunction with bars specified to EN 10088-3. This article covers flat bar tolerances to EN 10058, and cover thickness, width, length, straightness and 'out-of-section'.
Width, thickness , straightness and 'out-of-section'
The table below, based on Table 2 of the standard, summarizes width, thickness, straightness and 'out-of-section' deviations.
| Width (b) |
Nominal width |
Limit deviation |
| - |
between 10 and 40 |
+/- 0.75 |
| - |
over 40 up to 80 |
+/- 1 |
| - |
over 80 up to 100 |
+/- 1.5 |
| - |
over 100 up to 120 |
+/- 2 |
| - |
over 120 up to 150 |
+/- 2.5 |
| Thickness (t) |
Nominal thickness |
Limit deviation |
| - |
up to 20 |
+/- 0.5 |
| - |
over 20 up to 40 |
+/- 1 |
| - |
over 40 up to 80 |
+/- 1.5 |
| Straightness (q) |
Nominal cross-section |
Tolerance in the plane |
| - |
below 1000 mm2 |
below 0.4% of measuring length |
| - |
1000 mm2 and above |
below 0.25% of measuring length |
| Out-of-section (u) |
Nominal thickness |
Tolerance |
| - |
between 10 and 25 |
0.5 |
| - |
over 25 up to 40 |
1 |
| - |
over 40 up to 80 |
1.5 |
Notes
All dimensions are in mm.
If agreed at the enquiry and order stage, limit deviations (ranges) can be all plus, minus zero, rather than equal plus / minus.
Length tolerances
The standard states 'Depending on the type of length, flat bars shall be cut to lengths within tolerances given in Table 3'. Table 3 categorises the type of length and notes that it is the purchaser's responsibility to indicate at enquiry and order stages the type of length required and the length range or length required. No further explanation of the terms used in the standard is given. The table below, is based on Table 3 of the standard.
| Type of length |
Range |
Limit deviation |
| Manufacturing length (M) |
3000 to 13000 with a range of 2000 per order item |
10% of bars may be below the minimum for the ordered range, but not less than 75% of the minimum of the range |
| Fixed length (F) |
3000 to 13000 |
+/- 100 |
| Exact length (E) |
below 6000 |
+/- 25 |
| - |
between 6000 and 13000 |
+/- 50 |
Notes
All dimensions are in mm.
If agreed at the enquiry and order stage, limit deviations (ranges) can be all plus, minus zero, rather than equal plus / minus.
Methods of measurement
EN 10058 specifies methods of measurement for the dimensional tolerances given. These are summarised below.
Width and thickness
Width and thickness must be measured at least 100mm from the end of the bar.
Straightness
Straightness is measured as the maximum distance from a flat bed on which the bar rests to the underside of the "hogs back" shape of the bar. Straightness must be measured over the total length of the bar.
Out-of-section
Out-of-section tolerance, u, applies to both nominal width, b and nominal thickness, t.
Related References:
Type of Hot Rolling Mill
Hot rolled stainless steel Tube
Hot Rolled Steel Thickness Weight Table
Tolerance to EN 10058 for Hot Rolled Flat Stainless Steel Bar
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