Chemical compositions of stainless steels to BS EN 10217-7

Introduction

BS EN 10217-7 2014 is the latest revision for stainless steels for welded tubes for pressure purposes. The standard was first published in 2005. The latest revision has not added any new grades. Some anomalies have been corrected. Nickel and chromium contentes are now quoted to 1dp compared to 2dp. The nickel content for grade 1.4307 is now harmonised at 8.0/10.5 in line with other standards. It had been 8.00/10.00 in the 2005 version.

Included in the standard are chemical compositions, delivery conditions and process route symbols, ambient temperature mechanical properties, some additional optional tests (leak testing, flattening, drift expansion, bend and non-destructive testing) and some dimensional and tolerance requirements.
Austenitic (19), and austenitic-ferritic (duplex) (4) stainless steel grades are included in the range of grades specified in this standard. Only the chemical composition of the stainless steels in the standard are listed in this article.

It is interesting to compare the grades listed in this standard with those in the standard for welded stainless steel for general engineering purposes BS EN 10296-2. See table below. The implication of this is that some grades can be used for pressure purposes which cannot be used for general purposes. It is unlikely that this anomaly was the intention of  the standards writers.

It might be expected that any steels appearing in BS EN 10028-7 Flat products for pressure purposes would appear in the comparable welded tube standard. This is not the case. The following grades in BS EN 10028-7 are not found in BS EN 10217-7:

Ferritic grades - 1.4003, 1.4516, 1.4510, 1.4521, 1.4520, 1.4509

Martensitic grades - 1.4313, 1.4418

Austenitic grades - 1.4318, 1.4315, 1.4406, 1.4335, 1.4466, 1.4580, 1.4434, 1.4537

Duplex grades - 1.4507

Creep resisting steels - 1.4948, 1.4950, 1.4951, 1.4941, 1.4958, 1.4959, 1.4910, 1.4961

As an alternative to scanning down the list try the 'find' facility on your keyboard, using the 'Ctrl' and 'F' keys together. Type in the term you are looking for in the dialog box that then appears.
The data given is not intended to replace that shown in individual standards to which reference should always be made.

BS EN 10217-7 chemical composition tables

Corrosion resistant steels

Designation Chemical composition (% by mass - max unless stated)
Steel name Steel number C Si Mn P S Cr Mo Ni Cu N Others In 10296-2?
Austenitic steels
X2CrNi18-9 1.4307 0.030 1.00 2.00 0.045 0.015 17.5/19.5 - 8.0/10.0 - 0.11 - Yes
X2CrNi19-11 1.4306 0.030 1.00 2.00 0.045 0.015 18.0/20.0 - 10.0/12.0 - 0.11 - Yes
X2CrNiN18-10 1.4311 0.030 1.00 2.00 0.045 0.015 17.0/19.5 - 8.5/11.5 - 0.12/0.22 - Yes
X5CrNi18-10 1.4301 0.07 1.00 2.00 0.045 0.015 17.0/19.5 - 8.0/10.5 - 0.11 - Yes
X6CrNiTi18-10 1.4541 0.08 1.00 2.00 0.045 0.015 17.0/19.0 - 9.0/12.0 - - Ti 5xC/0.70 Yes
X6CrNiNb18-10 1.4550 0.08 1.00 2.00 0.045 0.015 17.0/19.0 - 9.0/12.0 - - Nb 10xC/1.00 Yes
X2CrNiMo17-12-2 1.4404 0.030 1.00 2.00 0.045 0.015 16.5/18.5 2.0/2.5 10.0/13.0 - 0.11 - Yes
X5CrNiMo17-12-2 1.4401 0.07 1.00 2.00 0.045 0.015 16.5/18.5 2.0/2.5 10.0/13.0 - 0.11 - Yes
XCrNiMoTi17-12-2 1.4571 0.08 1.00 2.00 0.045 0.015 16.5/18.5 2.00/2.50 10.5/13.5 - - Ti 5xC/0.70 Yes
X2CrNiMo17-12-3 1.4432 0.030 1.00 2.00 0.045 0.015 16.5/18.5 2.50/3.00 10.5/13.0 - 0.11 - Yes
X2CrNiMoN17-13-3 1.4429 0.030 1.00 2.00 0.045 0.015 16.5/18.5 2.50/3.00 11.0/14.0 - 0.12/0.22 - Yes
X3CrNiMo17-13-3 1.4436 0.05 1.00 2.00 0.045 0.015 16.5/18.5 2.50/3.00 10.5/13.0 - 0.11 - Yes
X2CrNiMo18-14-3 1.4435 0.030 1.00 2.00 0.045 0.015 17.0/19.0 2.50/3.00 12.5/15.0 - 0.11 - Yes
X2CrNiMoN17-13-5 1.4439 0.030 1.00 2.00 0.040 0.015 16.5/18.5 4.00/5.00 12.5/14.5 - 0.12/0.22 - Yes
X2CrNiMo18-15-4 1.4438 0.030 1.00 2.00 0.045 0.015 17.5/19.5 3.00/4.00 13.0/16.0 - 0.11 - No
X1NiCrMoCu31-27-4 1.4563 0.020 0.70 2.00 0.030 0.010 26.0/28.0 3.00/4.00 30.0/32.0 0.70/1.50 0.11 - No
X1CrNiMoCu25-20-5 1.4539 0.020 0.70 2.00 0.030 0.010 19.0/21.0 4.00/5.00 24.0/26.0 1.20/2.00 0.15 - Yes
X1CrNiMoCuN20-18-7 1.4547 0.020 0.70 1.00 0.030 0.010 19.5/20.5 6.00/7.00 17.5/18.5 0.50/1.00 0.18/0.25 - Yes
X1NiCrMoCuN25-20-7 1.4529 0.020 0.50 1.00 0.030 0.010 19.0/21.0 6.00/7.00 24.0/26.0 0.50/1.50 0.15/0.25 - No
Austenitic ferritic steels
X2CrNiN23-4 1.4362 0.030 1.00 2.00 0.035 0.015 22.0/24.0 0.10/0.60 3.5/5.5 0.10/0.60 0.05/0.20 - Yes
X2CrNiMoN22-5-3 1.4462 0.030 1.00 2.00 0.035 0.015 21.0/23.0 2.50/3.50 4.5/6.5 - 0.10/0.22 - Yes
X2CrNiMoN25-7-4 1.4410 0.030 1.00 2.00 0.035 0.015 24.0/26.0 3.00/4.50 6.0/8.0 - 0.20/0.35 - Yes
X2CrNiMoCuWN25-7-4 1.4501 0.030 1.00 1.00 0.035 0.015 24.0/26.0 3.00/4.00 6.0/8.0 0.50/1.00 0.20/0.30 W 0.50/1.00 No

 

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