Standards guide · Welded stainless steel tubes
Welded stainless steel tubes to EN 10217-7: dimensions, weights and limit deviations
Welded tubes of stainless steels are governed by EN 10217-7. This page carries our dimension overview for them: for every dimension the weight per metre and the two limit deviations that apply to it – and the way there through the dimension finder. The preferred dimensions here do not follow EN 10220 as they do for the non-alloy tube, but EN ISO 1127; that is why some of the diameters differ from those on the neighbouring pages.
- Standard
- DIN EN 10217-7:2021-06
- Manufacturing process
- welded, stainless
- Outside diameter
- 17.2–508 mm
- Wall thicknesses
- 1.6–5 mm
Dimension finder: outside diameter and wall thickness
Select the outside diameter and the wall thickness – the drawing shows exactly this dimension, dimensioned, with the calculated inside diameter. Below it are all wall thicknesses that EN 10217-7 lists for this diameter. The preset is ⌀ 88.9 mm, a medium size of the first diameter series. The tables for the dimensions covered here are further down.
EN 10217-7 covers the greyed-out sizes. Our dimension overview lists them as order dimensions – see the table “Further deliverable dimensions” below.
| Twall thickness in mm | IDinside diameter in mm, calculated by us | Weightweight per metre in kg/m | per 6 mweight of a 6 m length in kg, calculated by us | Water contentlitres per metre, calculated by us | Cross-sectionsteel cross-sectional area in cm², calculated by us | Surfaceoutside surface area in m² per metre, calculated by us | Limit deviation ⌀permissible deviation of the outside diameter in mm | Limit deviation Tpermissible deviation of the wall thickness in mm |
|---|
Without JavaScript this selection stays empty – the overview in the tables below is independent of it.
Zickwolff dimension table (standard reference EN 10217-7)
One row per dimension, and every row carries everything that belongs to it: wall thickness, weight per metre and both limit deviations. Ø series is the diameter series of EN 10220 – it belongs to the outside diameter, not to the wall thickness.
Five columns are calculated by us, the standard does not list them: the inside diameter as D − 2 × T, the water content as the clear cross-sectional area times one metre, the steel cross-section as the annular area, the weight per 6 m as weight per metre times 6 and the surface as the outer circumference times one metre. All are nominal values without a tolerance of their own – how far they may deviate in a given case follows from the limit deviations for outside diameter and wall thickness.
Standard reference for the limit deviations: EN 10217-7, of the standard. The column per 6 m is a calculation aid and not a commitment on the delivery length; which lengths are customary is stated under Lengths.
1 11 of these dimensions lie outside the preferred dimensions of EN 10220: the standard grades outside diameters and wall thicknesses, and this combination is not part of that grading. It is listed here nevertheless, because it exists. A dash in the Ø series column means that the outside diameter itself is not in the series of EN 10220 either.
Show full table · more than 70 rows
| Doutside diameter in mm | ⌀ seriesdiameter series to EN 10220 | Twall thickness in mm | IDinside diameter in mm, calculated by us | Weightweight per metre in kg/m | per 6 mweight of a 6 m length in kg, calculated by us | Water contentlitres per metre, calculated by us | Cross-sectionsteel cross-sectional area in cm², calculated by us | Surfaceoutside surface area in m² per metre, calculated by us | Limit deviation ⌀permissible deviation of the outside diameter in mm | Limit deviation Tpermissible deviation of the wall thickness in mm |
|---|---|---|---|---|---|---|---|---|---|---|
| 17.2 | 1 | 1.6 | 14.0 | 0.625 | 3.75 | 0.154 | 0.784 | 0.054 | ±0.300 (D3) | ±0.200 (T3) |
| 17.2 | 1 | 2.0 | 13.2 | 0.761 | 4.57 | 0.137 | 0.955 | 0.054 | ±0.300 (D3) | ±0.200 (T3) |
| 17.2 | 1 | 2.3 | 12.6 | 0.858 | 5.15 | 0.125 | 1.077 | 0.054 | ±0.300 (D3) | ±0.230 (T3) |
| 21.3 | 1 | 1.6 | 18.1 | 0.789 | 4.73 | 0.257 | 0.990 | 0.067 | ±0.300 (D3) | ±0.200 (T3) |
| 21.3 | 1 | 2.0 | 17.3 | 0.966 | 5.80 | 0.235 | 1.213 | 0.067 | ±0.300 (D3) | ±0.200 (T3) |
| 21.3 | 1 | 2.6 | 16.1 | 1.22 | 7.32 | 0.204 | 1.527 | 0.067 | ±0.300 (D3) | ±0.260 (T3) |
| 21.3 | 1 | 3.2 | 14.9 | 1.45 | 8.70 | 0.174 | 1.820 | 0.067 | ±0.300 (D3) | ±0.320 (T3) |
| 26.9 | 1 | 1.6 | 23.7 | 1.01 | 6.06 | 0.441 | 1.272 | 0.085 | ±0.300 (D3) | ±0.200 (T3) |
| 26.9 | 1 | 2.0 | 22.9 | 1.25 | 7.50 | 0.412 | 1.565 | 0.085 | ±0.300 (D3) | ±0.200 (T3) |
| 26.9 | 1 | 2.6 | 21.7 | 1.58 | 9.48 | 0.370 | 1.985 | 0.085 | ±0.300 (D3) | ±0.260 (T3) |
| 33.7 | 1 | 1.6 | 30.5 | 1.29 | 7.74 | 0.731 | 1.614 | 0.106 | ±0.300 (D3) | ±0.200 (T3) |
| 33.7 | 1 | 2.0 | 29.7 | 1.58 | 9.48 | 0.693 | 1.992 | 0.106 | ±0.300 (D3) | ±0.200 (T3) |
| 33.7 | 1 | 2.6 | 28.5 | 2.02 | 12.1 | 0.638 | 2.540 | 0.106 | ±0.300 (D3) | ±0.260 (T3) |
| 33.7 | 1 | 3.2 | 27.3 | 2.45 | 14.7 | 0.585 | 3.066 | 0.106 | ±0.300 (D3) | ±0.320 (T3) |
| 38 | 2 | 2.0 | 34.0 | 1.81 | 10.9 | 0.908 | 2.262 | 0.119 | ±0.300 (D3) | ±0.200 (T3) |
| 42.4 | 1 | 1.6 | 39.2 | 1.63 | 9.78 | 1.21 | 2.051 | 0.133 | ±0.318 (D3) | ±0.200 (T3) |
| 42.4 | 1 | 2.0 | 38.4 | 2.02 | 12.1 | 1.16 | 2.538 | 0.133 | ±0.318 (D3) | ±0.200 (T3) |
| 42.4 | 1 | 2.6 | 37.2 | 2.59 | 15.5 | 1.09 | 3.251 | 0.133 | ±0.318 (D3) | ±0.260 (T3) |
| 42.4 | 1 | 3.2 | 36.0 | 3.14 | 18.8 | 1.02 | 3.941 | 0.133 | ±0.318 (D3) | ±0.320 (T3) |
| 48.3 | 1 | 1.6 | 45.1 | 1.87 | 11.2 | 1.60 | 2.347 | 0.152 | ±0.362 (D3) | ±0.200 (T3) |
| 48.3 | 1 | 2.0 | 44.3 | 2.31 | 13.9 | 1.54 | 2.909 | 0.152 | ±0.362 (D3) | ±0.200 (T3) |
| 48.3 | 1 | 2.6 | 43.1 | 2.97 | 17.8 | 1.46 | 3.733 | 0.152 | ±0.362 (D3) | ±0.260 (T3) |
| 48.3 | 1 | 3.2 | 41.9 | 3.61 | 21.7 | 1.38 | 4.534 | 0.152 | ±0.362 (D3) | ±0.320 (T3) |
| 60.3 | 1 | 1.6 | 57.1 | 2.35 | 14.1 | 2.56 | 2.951 | 0.189 | ±0.452 (D3) | ±0.200 (T3) |
| 60.3 | 1 | 2.0 | 56.3 | 2.92 | 17.5 | 2.49 | 3.663 | 0.189 | ±0.452 (D3) | ±0.200 (T3) |
| 60.3 | 1 | 2.3 | 55.7 | 3.34 | 20.0 | 2.44 | 4.191 | 0.189 | ±0.452 (D3) | ±0.230 (T3) |
| 60.3 | 1 | 2.6 | 55.1 | 3.76 | 22.6 | 2.38 | 4.713 | 0.189 | ±0.452 (D3) | ±0.260 (T3) |
| 60.3 | 1 | 2.9 | 54.5 | 4.17 | 25.0 | 2.33 | 5.229 | 0.189 | ±0.452 (D3) | ±0.290 (T3) |
| 60.3 | 1 | 31 | 54.3 | 4.30 | 25.8 | 2.32 | 5.400 | 0.189 | ±0.452 (D3) | ±0.300 (T3) |
| 60.3 | 1 | 3.2 | 53.9 | 4.58 | 27.5 | 2.28 | 5.740 | 0.189 | ±0.452 (D3) | ±0.320 (T3) |
| 60.3 | 1 | 3.6 | 53.1 | 5.11 | 30.7 | 2.21 | 6.413 | 0.189 | ±0.452 (D3) | ±0.360 (T3) |
| 60.3 | 1 | 4.0 | 52.3 | 5.63 | 33.8 | 2.15 | 7.075 | 0.189 | ±0.452 (D3) | ±0.400 (T3) |
| 76.1 | 1 | 1.6 | 72.9 | 2.98 | 17.9 | 4.17 | 3.745 | 0.239 | ±0.571 (D3) | ±0.200 (T3) |
| 76.1 | 1 | 2.0 | 72.1 | 3.70 | 22.2 | 4.08 | 4.656 | 0.239 | ±0.571 (D3) | ±0.200 (T3) |
| 76.1 | 1 | 2.3 | 71.5 | 4.25 | 25.5 | 4.02 | 5.333 | 0.239 | ±0.571 (D3) | ±0.230 (T3) |
| 76.1 | 1 | 2.6 | 70.9 | 4.78 | 28.7 | 3.95 | 6.004 | 0.239 | ±0.571 (D3) | ±0.260 (T3) |
| 76.1 | 1 | 2.9 | 70.3 | 5.32 | 31.9 | 3.88 | 6.669 | 0.239 | ±0.571 (D3) | ±0.290 (T3) |
| 76.1 | 1 | 3.6 | 68.9 | 6.54 | 39.2 | 3.73 | 8.200 | 0.239 | ±0.571 (D3) | ±0.360 (T3) |
| 76.1 | 1 | 4.0 | 68.1 | 7.22 | 43.3 | 3.64 | 9.060 | 0.239 | ±0.571 (D3) | ±0.400 (T3) |
| 88.9 | 1 | 1.6 | 85.7 | 3.49 | 20.9 | 5.77 | 4.388 | 0.279 | ±0.667 (D3) | ±0.200 (T3) |
| 88.9 | 1 | 2.0 | 84.9 | 4.35 | 26.1 | 5.66 | 5.460 | 0.279 | ±0.667 (D3) | ±0.200 (T3) |
| 88.9 | 1 | 2.3 | 84.3 | 4.98 | 29.9 | 5.58 | 6.257 | 0.279 | ±0.667 (D3) | ±0.230 (T3) |
| 88.9 | 1 | 2.6 | 83.7 | 5.61 | 33.7 | 5.50 | 7.049 | 0.279 | ±0.667 (D3) | ±0.260 (T3) |
| 88.9 | 1 | 2.9 | 83.1 | 6.24 | 37.4 | 5.42 | 7.835 | 0.279 | ±0.667 (D3) | ±0.290 (T3) |
| 88.9 | 1 | 31 | 82.9 | 6.46 | 38.8 | 5.40 | 8.096 | 0.279 | ±0.667 (D3) | ±0.300 (T3) |
| 88.9 | 1 | 3.2 | 82.5 | 6.86 | 41.2 | 5.35 | 8.616 | 0.279 | ±0.667 (D3) | ±0.320 (T3) |
| 88.9 | 1 | 4.0 | 80.9 | 8.51 | 51.1 | 5.14 | 10.67 | 0.279 | ±0.667 (D3) | ±0.400 (T3) |
| 114.3 | 1 | 2.0 | 110.3 | 5.62 | 33.7 | 9.56 | 7.056 | 0.359 | ±0.857 (D3) | ±0.200 (T3) |
| 114.3 | 1 | 2.6 | 109.1 | 7.27 | 43.6 | 9.35 | 9.124 | 0.359 | ±0.857 (D3) | ±0.260 (T3) |
| 114.3 | 1 | 2.9 | 108.5 | 8.09 | 48.5 | 9.25 | 10.15 | 0.359 | ±0.857 (D3) | ±0.290 (T3) |
| 114.3 | 1 | 31 | 108.3 | 8.35 | 50.1 | 9.21 | 10.49 | 0.359 | ±0.857 (D3) | ±0.300 (T3) |
| 114.3 | 1 | 3.6 | 107.1 | 9.98 | 59.9 | 9.01 | 12.52 | 0.359 | ±0.857 (D3) | ±0.360 (T3) |
| 139.7 | 1 | 2.0 | 135.7 | 6.89 | 41.3 | 14.5 | 8.652 | 0.439 | ±1.05 (D3) | ±0.200 (T3) |
| 139.7 | 1 | 2.6 | 134.5 | 8.92 | 53.5 | 14.2 | 11.20 | 0.439 | ±1.05 (D3) | ±0.260 (T3) |
| 139.7 | 1 | 31 | 133.7 | 10.3 | 61.8 | 14.0 | 12.88 | 0.439 | ±1.05 (D3) | ±0.300 (T3) |
| 139.7 | 1 | 4.0 | 131.7 | 13.6 | 81.6 | 13.6 | 17.05 | 0.439 | ±1.05 (D3) | ±0.400 (T3) |
| 168.3 | 1 | 2.0 | 164.3 | 8.32 | 49.9 | 21.2 | 10.45 | 0.529 | ±1.26 (D3) | ±0.200 (T3) |
| 168.3 | 1 | 2.6 | 163.1 | 10.8 | 64.8 | 20.9 | 13.53 | 0.529 | ±1.26 (D3) | ±0.260 (T3) |
| 168.3 | 1 | 31 | 162.3 | 12.4 | 74.4 | 20.7 | 15.58 | 0.529 | ±1.26 (D3) | ±0.300 (T3) |
| 168.3 | 1 | 4.0 | 160.3 | 16.4 | 98.4 | 20.2 | 20.65 | 0.529 | ±1.26 (D3) | ±0.400 (T3) |
| 219.1 | 1 | 2.0 | 215.1 | 10.9 | 65.4 | 36.3 | 13.64 | 0.688 | ±2.19 (D2) | ±0.200 (T3) |
| 219.1 | 1 | 2.6 | 213.9 | 14.1 | 84.6 | 35.9 | 17.68 | 0.688 | ±2.19 (D2) | ±0.260 (T3) |
| 219.1 | 1 | 31 | 213.1 | 16.2 | 97.2 | 35.7 | 20.37 | 0.688 | ±2.19 (D2) | ±0.300 (T3) |
| 219.1 | 1 | 4.0 | 211.1 | 21.5 | 129.0 | 35.0 | 27.03 | 0.688 | ±2.19 (D2) | ±0.400 (T3) |
| 273 | 1 | 2.6 | 267.8 | 17.6 | 105.6 | 56.3 | 22.09 | 0.858 | ±2.73 (D2) | ±0.260 (T3) |
| 273 | 1 | 31 | 267.0 | 20.3 | 121.8 | 56.0 | 25.45 | 0.858 | ±2.73 (D2) | ±0.300 (T3) |
| 273 | 1 | 4.0 | 265.0 | 26.9 | 161.4 | 55.2 | 33.80 | 0.858 | ±2.73 (D2) | ±0.400 (T3) |
| 323.9 | 1 | 31 | 317.9 | 24.1 | 144.6 | 79.4 | 30.24 | 1.018 | ±3.24 (D2) | ±0.300 (T3) |
| 323.9 | 1 | 4.0 | 315.9 | 32.1 | 192.6 | 78.4 | 40.20 | 1.018 | ±3.24 (D2) | ±0.400 (T3) |
| 323.9 | 1 | 5.0 | 313.9 | 39.9 | 239.4 | 77.4 | 50.09 | 1.018 | ±3.24 (D2) | ±0.500 (T3) |
| 355.6 | 1 | 31 | 349.6 | 26.5 | 159.0 | 96.0 | 33.23 | 1.117 | ±3.56 (D2) | ±0.300 (T3) |
| 355.6 | 1 | 4.0 | 347.6 | 35.2 | 211.2 | 94.9 | 44.18 | 1.117 | ±3.56 (D2) | ±0.400 (T3) |
| 406.4 | 1 | 31 | 400.4 | 30.2 | 181.2 | 125.9 | 38.02 | 1.277 | ±4.06 (D2) | ±0.300 (T3) |
| 406.4 | 1 | 4.0 | 398.4 | 40.3 | 241.8 | 124.7 | 50.57 | 1.277 | ±4.06 (D2) | ±0.400 (T3) |
| 508 | – | 41 | 500.0 | 50.4 | 302.4 | 196.3 | 63.33 | 1.596 | ±5.08 (D2) | ±0.400 (T3) |
Further deliverable dimensions (59)
Show full table · more than 50 rows
| outside diameter in mm | wall thickness in mm | inside diameter in mm, calculated by us | weight per metre in kg/m |
|---|---|---|---|
| 6 | 1.0 | 4.0 | 0.125 |
| 8 | 1.0 | 6.0 | 0.176 |
| 10 | 1.0 | 8.0 | 0.225 |
| 12 | 1.0 | 10.0 | 0.275 |
| 12 | 2.0 | 8.0 | 0.500 |
| 13.5 | 2.3 | 8.9 | 0.645 |
| 14 | 1.0 | 12.0 | 0.326 |
| 14 | 2.0 | 10.0 | 0.601 |
| 16 | 1.0 | 14.0 | 0.376 |
| 16 | 2.0 | 12.0 | 0.701 |
| 18 | 1.0 | 16.0 | 0.425 |
| 18 | 2.0 | 14.0 | 0.801 |
| 19 | 1.2 | 16.6 | 0.535 |
| 20 | 1.0 | 18.0 | 0.476 |
| 20 | 2.0 | 16.0 | 0.901 |
| 22 | 1.0 | 20.0 | 0.526 |
| 22 | 2.0 | 18.0 | 1.00 |
| 25 | 1.0 | 23.0 | 0.601 |
| 25 | 1.2 | 22.6 | 0.715 |
| 25 | 2.0 | 21.0 | 1.15 |
| 26.9 | 3.2 | 20.5 | 1.90 |
| 30 | 2.0 | 26.0 | 1.40 |
| 32 | 2.0 | 28.0 | 1.50 |
| 35 | 2.0 | 31.0 | 1.65 |
| 38 | 2.6 | 32.8 | 2.30 |
| 40 | 2.6 | 34.8 | 2.44 |
| 42.4 | 3.6 | 35.2 | 3.49 |
| 42.4 | 5.0 | 32.4 | 4.68 |
| 44.5 | 2.0 | 40.5 | 2.13 |
| 44.5 | 2.6 | 39.3 | 2.73 |
| 44.5 | 2.9 | 38.7 | 3.02 |
| 48.3 | 3.6 | 41.1 | 4.03 |
| 48.3 | 5.0 | 38.3 | 5.42 |
| 51 | 2.0 | 47.0 | 2.46 |
| 51 | 2.6 | 45.8 | 3.15 |
| 54 | 2.0 | 50.0 | 2.60 |
| 57 | 2.0 | 53.0 | 2.75 |
| 57 | 2.9 | 51.2 | 3.93 |
| 63.5 | 1.6 | 60.3 | 2.48 |
| 63.5 | 2.0 | 59.5 | 3.08 |
| 63.5 | 2.6 | 58.3 | 3.96 |
| 70 | 2.0 | 66.0 | 3.40 |
| 76.1 | 5.0 | 66.1 | 8.90 |
| 88.9 | 3.6 | 81.7 | 7.68 |
| 101.6 | 2.0 | 97.6 | 4.98 |
| 101.6 | 4.0 | 93.6 | 9.77 |
| 114.3 | 4.5 | 105.3 | 12.4 |
| 139.7 | 1.6 | 136.5 | 5.53 |
| 139.7 | 5.0 | 129.7 | 16.8 |
| 168.3 | 3.2 | 161.9 | 13.2 |
| 168.3 | 5.0 | 158.3 | 20.4 |
| 219.1 | 3.2 | 212.7 | 17.3 |
| 219.1 | 6.3 | 206.5 | 33.6 |
| 273 | 2.0 | 269.0 | 13.6 |
| 323.9 | 2.6 | 318.7 | 20.9 |
| 323.9 | 10.0 | 303.9 | 78.6 |
| 355.6 | 5.0 | 345.6 | 43.8 |
| 406.4 | 5.0 | 396.4 | 50.2 |
| 508 | 5.0 | 498.0 | 62.9 |
Order dimensions and values calculated by us; deliverable from stock or procured, availability on request. Limit deviations and figures from the standard: see the main table and the standard itself.
What has changed since the earlier edition
For the stainless steel tube, welded, the comparison covers the editions from DIN EN 10217-7:2015-01. Not yet recorded: DIN 17457 and edition 2005-05 (available in-house, deliberately not applied retroactively).
DIN EN 10217-7:2015-01 → DIN EN 10217-7:2021-06
-
system
The delivery condition table (Table 2) carries the eleven symbols W0 to WP unchanged - new are the strip starting material 2R, the addition “and/or pickled” for W1, W1A, W2, W2A and WCA together with a new footnote e, and the W0 footnote f on residual scale, heat tint and grease residues.
editions 2015-01 and 2021-06 · Table 2
-
system
Options 9 and 10 on agreements about the mechanical properties at room and elevated temperature have been deleted.
editions 2015-01 and 2021-06 · National foreword
-
limit value
Two new options limit the maximum height of the weld bead (option 28: agreed values, option 29: at most 4 mm).
editions 2015-01 and 2021-06 · National foreword, Table 11
These entries say what the standard has changed. They say nothing about material, pressure rating, scope of testing or the condition of an installed part — and nothing about whether an existing part can continue to be used. That assessment remains with the specific plant.
Lengths: what the standard leaves open and what the market supplies
EN 10217-7 does not specify a length. Tubes are supplied in random lengths, whose range is part of the order and is agreed there. Exact lengths with their own limit deviations are possible, but a design that has to be agreed expressly – not the normal case. That is why the drawing on this page carries no length dimension and shows the tube broken off on the right: the length is not a property of the dimension but a matter of the order.
Customary on the market are mostly 6 m, from continuous production up to 18 m. That is the standard length that stockholders and mills supply for tubes of this manufacturing process – welded, stainless, a figure taken from stock programmes, not from the standard. Whoever needs a specific length states it in the inquiry; whoever plans a quantity calculates with it.
The column per 6 m in the tables on this page calculates with 6 m, because that is the round figure within this range. It is a calculation aid and not a commitment: for a different length take the Weight column (kg per m) and multiply yourself.
How weight and limit deviations come about
The weight per metre is a calculation, not a table entry: outside diameter and wall thickness give the cross-sectional area of the tube, times the density of steel of 7.85 kg/dm³. We calculate it to EN 10220 for every dimension in this overview – which is why every row shows a figure and nowhere a dash.
A limit deviation is not a property of the row but a figure that refers to the nominal dimension. For the outside diameter the ratio is not the same throughout: it depends on the diameter. The row shows the figure that applies to exactly this dimension. For the wall thickness that is ± 10 % of the nominal dimension, at least ± 0.2 mm. We calculate it for every dimension in this overview, so that the row shows the figure and not a percentage that one would still have to apply oneself.
It is recalculated every time this page is rebuilt, row by row. If one does not add up, the page is not built.
How to measure correctly
A tube is identified by two measurements: outside diameter D and wall thickness T. Measure D with a calliper in two directions at right angles – the difference is the out-of-roundness – and T at the tube end. The inside diameter is not measured but calculated: D minus twice T.
Workmanship and testing: what is not a dimension
Not everything that has to be right about a tube is in the dimension table. How high a weld may stand, how far the strip edges may be offset against each other, how straight it has to be and how round the cross-section has to be – that too is part of the workmanship, and at incoming inspection it helps decide whether a delivery is accepted. Added to this is what can be seen on the delivery: the surface, the delivery condition, the ends, the marking and the protection on the way to site.
What is measured on the tube
- Straightness – all
- at most 0.0015 L, per metre at most 3 mm
- Out-of-roundness – all
- up to D 406.4 included in the limit deviations of the outside diameter · over D 406.4 at D/T up to 100: (Dmax − Dmin)/D × 100 at most 2 % · at D/T over 100 to be agreed
- Weld bead height – per manufacturing process (process no. to Table 1)
- as welded: 0.10 T + 0.5 (T up to 8) or T/6 · ground outside: 0.06 T + 0.3 (D up to 114.3) or 0.05 T + 0.5 · bead worked: 0.15
- Radial offset of the strip edges – all
- at most 10 % of the nominal wall thickness
Delivery and marking
- Surface condition – all
- free from surface defects that can be detected by visual inspection without special equipment · surface in the condition typical of the manufacturing process and heat treatment · rework only by grinding or machining, without going below the minimum wall thickness · repair welding of the weld is permitted (to a written welding procedure, followed by non-destructive testing), with option 12 only with the purchaser's consent
- Delivery condition – per delivery condition to Table 2
- W0 as welded – residual scale, heat tint and grease residues permitted · W1, W1A, W2, W2A, WCA descaled and/or pickled – metallically clean · W1R, W2R, WCR bright annealed – metallically bright · WG ground and WP polished – type and roughness to be agreed · suffix b: smoothed weld (bead worked)
- Tube ends – all
- cut square to the tube axis and free from excessive burrs · bevelling only with option 16 for wall thicknesses from 3.2 mm: 30° +5/0 with a root face of 1.6 ± 0.8 mm, over 20 mm wall thickness by agreement
- Marking – all
- depending on the tube diameter on a label on the bundle or durably on every tube, at least at one end: manufacturer, tube dimensions, EN 10217-7 with steel name or steel number and test category TC1 or TC2, cast number, mark of the inspection representative, identification number, delivery condition symbol · option 25: additional marking
- Surface protection – all
- to be protected from contact with packaging strap of non-alloy steel · special protection only with option 26
Standard reference for these details: EN 10217-7. What is stated here is the requirement – it is measured on the delivered tube, and where a tolerance class or an option comes into play, it belongs in the order.
From practice: where ordering goes wrong
The delivery condition belongs in the order. The standard carries a set of symbols for heat treatment and surface finish. They decide about appearance and corrosion behaviour more than the material alone does – and they cannot be changed afterwards.
The tolerance class is a specification of its own. With stainless tubes the permissible deviation does not depend on a fixed percentage but on the class in which the tube is ordered. Anyone who needs a closer class names it – otherwise the default class of the standard applies.
With stainless steel the weld is a subject of its own. Whether it is dressed, smoothed or left as welded is stated in the symbols of the delivery condition, and where the medium touches it, that is often the decisive question.
What this page does not say
- No material selection. EN 10217-7 carries austenitic and austenitic-ferritic stainless steels – in the trade above all 1.4301, 1.4307, 1.4404 and 1.4571. Which grade suits your case is decided by medium, temperature and corrosion load – not by the dimension. The materials overview puts the grades in context.
- No design calculation. Diameter and wall thickness do not yield a permissible working pressure. That calculation belongs to plant engineering.
- Only this one standard. Seamless stainless tubes are covered by EN 10216-5, welded tubes of non-alloy steels by EN 10217-1. The overview is on the page Steel pipes.
Frequently asked questions
What does EN 10217-7 govern?
The standard applies to welded tubes of stainless steels for pressure purposes. Among other things it lays down materials, delivery conditions, limit deviations and test conditions.
How much does one metre of tube weigh?
The weight per metre is shown in this overview for every dimension. It is calculated from outside diameter and wall thickness.
Why are the diameters different from those of the non-alloy tube?
Because the preferred dimensions here follow EN ISO 1127 and not EN 10220. The two series overlap over wide stretches but are not identical.
What does the tolerance class mean?
It determines how far outside diameter and wall thickness may deviate from the nominal dimension. Which class applies is ordered; the dimension overview shows the value that follows from it for the dimension concerned.
Related pages
- Steel pipes: designation, standards and selection: the overview of the pipe families, the test categories and the materials.
- Welded steel tubes to EN 10217-1: the same construction in non-alloy steel – different preferred dimensions, different limit deviations.
- Materials overview: which stainless steel is good for what – and why the diameter does not decide it.
- Tolerances and limit deviations: how limit deviations are read and what they say about a component.
How this data is compiled. This page does not reproduce a standard. It shows the dimensions you need for an enquiry, an order and installation – for sizes we supply, checked against documents from manufacturing works and suppliers and against our own range. Each value states what kind of value it is: specified by the standard, calculated by us or customary in the trade. The currently valid standard is binding. It is available from DIN Media or from your national standards body. How we select our sources and keep them up to date: About this knowledge.
Technical basis of this page: DIN EN 10217-7:2021-06 together with EN ISO 1127 for the preferred dimensions. Weight, inside diameter, water content, cross-sectional area and surface area are calculated by us from outside diameter and wall thickness; the calculation is checked against the data layer on every build of this page.
Welded stainless steel tubes – ask our warehouse
Send us the dimension, the material, the delivery condition and the inspection document required. What is in stock we deliver at short notice; everything else we source on request.
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