Tolerance to EN 10296-2 Welded Stainless Steel Tubes
Unlike standards for flat and long products, the standard for stainless steel tubes products contain information on tolerances. This is possibly because the tolerance requirements for tubes are simpler to define.
Straightness
| OD |
Deviation from straightness on tube length L |
| > 33.7 mm |
0.0020 L |
| < 33.7 mm |
Agreed at time of enquiry and order |
Example 50mm dia tube x 6000 mm long maximum deviation from straightness = 12 mm
A tighter tolerance of 0.0015 L can be agreed at time of order and enquiry.
Outside Diameter
| OD |
Tolerance on OD including ovality |
| < 168.3 mm |
± 0.75 % or ± 0.3 mm whichever is the greater |
| > 168.3 mm |
± 1.0 % |
A tighter tolerance can be agreed at the time of enquiry and order on tubes of < 114.3 mm of ± 0.5 % or ± 0.15 mm whichever is the greater.
Wall Thickness
For all tube sizes tolerance on wall thickness is ± 10 % or ± 0.2 mm whichever is the greater.
Weld Seam Height
The outside weld bead of HF welded tube shall be removed completely i.e. flush with the outside surface of the tube.
The maximum heights of the external and internal weld seams shall otherwise be as given in the table below:
| Weld finish |
Maximum height of weld seam |
| Wall thickness (T) < 8 mm |
Wall thickness (T) > 8 mm |
| Finish A |
0.20 T + 0.5 |
T/3 |
| Finish B for D < 114.3 mm |
0.06 T + 0.3 |
- |
| Finish B for D > 114.3 mm |
0.05 T + 0.5 |
T/6 |
| Finish C |
0.15 |
- |
Finish A - Internal and external weld bead not removed
Finish B - External weld bead removed internal weld bead not removed
Finish C - Internal and external weld bead rolled or removed
Finish A shall not be used on HF welded tube
Length
| Type of length |
Length L |
Tolerance |
| Standard |
6000 mm |
+100/-0 |
| Random |
Length range by arrangement |
| Exact |
< 6000 mm |
+5/-0 |
| 6000 < L < 12000 |
+10/-0 |
| >12000 |
by agreement |
Related References:
ISO Tolerances For Fasteners | ISO Tolerance Chart | ISO & Metric Standards | ISO Steel Pipe Tube and Fittings Standard | ISO 2768 | ISO 8062 BS6615 Casting Tolerance Standard | Rough Casting Tolerance
1. Tolerance to EN 10296-2 Welded Stainless Steel Tubes
2. EN 10296-2 Stainless Steel Chemical Composition
3. EN 10296-2 Stainless Steel Welded Tube Mechanical Properties
4. Tolerance for Stainless Steel Flat Products
|
