Tolerances to BS EN 10296-2 for Stainless Steel Tube Welding
Stainless Steel Tube Welding Introduction
Unlike the standards for flat and long products, the standards for stainless steel tube products contain information on tolerances. This is possibly because the tolerance requirements for tubes are simpler to define.
Stainless Steel Tube Welding 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.
EN 10296-2 2005 "Stainless Steel Tube Welding for mechanical and general engineering purposes - Technical delivery condition".
It covers a number of ferritic, austenitic, duplex austenitic-ferritic and heat-resisting steel. The mechanical properties are summarised in the table below.
| Steel grade | Proof strength min MPA | Tensile strength MPa | Elongation A min % | Resistance to intergranular corrosion | |||
| Steel name | Steel number | Rp0.2 | Rp1.0 | Rm | long | trans | |
| Ferritic | |||||||
| X2CrNi12 | 1.4003 | 280 | 290 | 450 | 20 | 18 | No |
| X2CrTi12 | 1.4512 409 | 210 | 220 | 380 | 25 | 23 | No |
| X6Cr17 | 1.4016 430 | 240 | 250 | 430 | 20 | 18 | Yes* |
| X3CrTi17 | 1.4510 | 230 | 240 | 420 | 23 | 21 | Yes |
| X2CrMoTi18-2 | 1.4521 | 280 | 280 | 400 | 20 | 20 | Yes |
| X6CrMoNb17-1 | 1.4526 | 280 | 290 | 480 | 25 | 23 | Yes |
| X2CrTiNb18 | 1.4509 | 230 | 240 | 430 | 18 | 16 | Yes |
| Austenitic | |||||||
| X2CrNiN18-7 | 1.4318 | 330 | 370 | 630 | 45 | 45 | Yes |
| X2CrNi18-9 | 304L 1.4307 | 180 | 215 | 470 | 40 | 35 | Yes |
| X2CrNi19-11 | 1.4306 | 180 | 215 | 460 | 40 | 35 | Yes |
| X2CrNiN18-10 | 304LN 1.4311 | 270 | 305 | 550 | 35 | 30 | Yes |
| X5CrNi18-10 | 304 1.4301 | 195 | 230 | 500 | 40 | 35 | Yes* |
| X6CrNiTi18-10 | 321 1.4541 | 200 | 235 | 500 | 35 | 30 | Yes |
| X6CrNiNb18-10 | 347 1.4550 | 205 | 240 | 510 | 35 | 30 | Yes |
| X2CrNiMo17-12-2 | 316L 1.4404 | 190 | 225 | 490 | 40 | 30 | Yes |
| X5CrNiMo17-12-2 | 316 1.4401 | 205 | 240 | 510 | 40 | 30 | Yes* |
| XCrNiMoTi17-12-2 | 316Ti 1.4571 | 210 | 245 | 510 | 35 | 30 | Yes |
| X2CrNiMo17-12-3 | 1.4432 | 190 | 225 | 490 | 40 | 30 | Yes |
| X2CrNiMoN17-13-3 | 1.4429 | 295 | 330 | 580 | 35 | 30 | Yes |
| X3CrNiMo17-13-3 | 1.4436 | 205 | 240 | 510 | 40 | 30 | Yes* |
| X2CrNiMo18-14-3 | 1.4435 | 190 | 225 | 490 | 40 | 35 | Yes |
| X2CrNiMoN17-13-5 | 317L 1.4439 | 285 | 315 | 580 | 35 | 30 | Yes |
| X1CrNiMoCu25-20-5 | 1.4539 | 220 | 250 | 520 | 35 | 30 | Yes |
| X1CrNiMoCuN20-18-7 | 1.4547 | 300 | 340 | 650 | 35 | 30 | Yes |
| Austenitic ferritic steel | |||||||
| X2CrNiN23-4 | 1.4362 | 400 | 600 | 20 | - | Yes | |
| X2CrNiMoN22-5-3 | 1.4462 | 450 | 700 | 22 | - | Yes | |
| X2CrNiMoN25-7-4 | 1.4410 | 550 | 800 | 15 | - | Yes | |
| Heat resisting steel | |||||||
| X15CrNiSi20-12 | 1.4828 | 230 | 270 | 550 | 30 | 30 | N/A |
| X9CrNiSiNCe21-11-2 | 1.4835 | 310 | 350 | 650 | 40 | 40 | N/A |
| X12CrNi23-13 | 1.4833 | 210 | 250 | 500 | 35 | 35 | N/A |
| X8CrNi25-21 | 1.4845 | 210 | 250 | 500 | 40 | 40 | N/A |
| X6CrNiSiNCe19-10 | 1.4818 | 290 | 330 | 600 | 40 | 40 | N/A |
| X6NiCrSiNCe35-25 | 1.4854 | 300 | 340 | 650 | 40 | 40 | N/A |
* Normally not fulfilled in the sensitised or as-welded condition
Related References:
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
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