Chemical compositions of stainless steels to EN 10217-7

EN 10217-7 2005 is the material standard for stainless steel for welded tubes for pressure purposes. This new standard was first published in February 2005.

Included in the standard are chemical composition, 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 steel 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 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.

The Cr and Nickel contents are quoted to 2 decimal places in EN 10217-7 whereas EN 10296-2 quotes only 1 dp. The reason for this is not clear. For grade 1.4307, the composition differs from that in EN 10296-2, in that the Nickel content is 8.00/10.00 compared to 8.0/10.5. This reflects the difference in the flat products standards to which the original strip would be made:

EN 10088-2 - Flat products for general purposes 1.4307 Ni 8.0/10.5
EN 10028-7 Flat products for pressure purposes 1.4307 Ni 8.00/10.00

It might be expected that any steels appearing in 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 EN 10028-7 are not found in EN 10217-7:

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

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.

Designation		Chemical composition (% by mass - max unless stated)
Steel name	Steel No.	C	Si	Mn	P	S	Cr	Mo	Ni	Cu	N		In 10296
Austenitic Stainless Steel
X2CrNi 18-9	1.4307	0.03	1.00	2.00	0.045	0.015	17.50 /19.50	-	8.00 /10.00	-	0.11	-	Yes
X2CrNi19-11	1.4306	0.03	1.00	2.00	0.045	0.015	18.00 /20.00	-	10.00 /12.00	-	0.11	-	Yes
X2CrNi N18-10	1.4311	0.03	1.00	2.00	0.045	0.015	17.00 /19.50	-	8.50 /11.50	-	0.12 /0.22	-	Yes
X5CrNi18-10	1.4301	0.07	1.00	2.00	0.045	0.015	17.00 /19.50	-	8.00 /10.50	-	0.11	-	Yes
X6CrNi Ti18-10	1.4541	0.08	1.00	2.00	0.045	0.015	17.00 /19.00	-	9.00 /12.00	-	-	Ti 5xC /0.70	Yes
X6CrNi Nb18-10	1.4550	0.08	1.00	2.00	0.045	0.015	17.00 /19.00	-	9.00 /12.00	-	-	Nb 10xC /1.00	Yes
X2CrNiMo 17-12-2	1.4404	0.03	1.00	2.00	0.045	0.015	16.50 /18.50	2.00 /2.50	10.00 /13.00	-	0.11	-	Yes
X5CrNiMo 17-12-2	1.4401	0.07	1.00	2.00	0.045	0.015	16.50 /18.50	2.00 /2.50	10.00 /13.00	-	0.11	-	Yes
XCrNiMoTi 17-12-2	1.4571	0.08	1.00	2.00	0.045	0.015	16.50 /18.50	2.00 /2.50	10.50 /13.50	-	-	Ti 5xC /0.70	Yes
X2CrNiMo 17-12-3	1.4432	0.03	1.00	2.00	0.045	0.015	16.50 /18.50	2.50 /3.00	10.50 /13.00	-	0.11	-	Yes
X2CrNiMo N17-13-3	1.4429	0.03	1.00	2.00	0.045	0.015	16.50 /18.50	2.50 /3.00	11.00 /14.00	-	0.12 /0.22	-	Yes
X3CrNiMo 17-13-3	1.4436	0.05	1.00	2.00	0.045	0.015	16.50 /18.50	2.50 /3.00	10.50 /13.00	-	0.11	-	Yes
X2CrNiMo 18-14-3	1.4435	0.03	1.00	2.00	0.045	0.015	17.00 /19.00	2.50 /3.00	12.50 /15.00	-	0.11	-	Yes
X2CrNiMo N17-13-5	1.4439	0.03	1.00	2.00	0.040	0.015	16.50 /18.50	4.00 /5.00	12.50 /14.50	-	0.12 /0.22	-	Yes
X2CrNiMo 18-15-4	1.4438	0.03	1.00	2.00	0.045	0.015	17.50 /19.50	3.00 /4.00	13.00 /16.00	-	0.11	-	No
X1NiCrMo Cu31-27-4	1.4563	0.02	0.70	2.00	0.030	0.010	26.00 /28.00	3.00 /4.00	30.00 /32.00	0.70 /1.50	0.11	-	No
X1CrNiMo Cu25-20-5	1.4539	0.02	0.70	2.00	0.030	0.010	19.00 /21.00	4.00 /5.00	24.00 /26.00	1.20 /2.00	0.15	-	Yes
X1CrNiMo CuN20-18-7	1.4547	0.02	0.70	1.00	0.030	0.010	19.50 /20.50	6.00 /7.00	17.50 /18.50	0.50 /1.00	0.18 /0.25	-	Yes
X1NiCrMo CuN25-20-7	1.4529	0.02	0.50	1.00	0.030	0.010	19.00 /21.00	6.00 /7.00	24.00 /26.00	0.50 /1.50	0.15 /0.25	-	No
Austenitic ferritic steels
X2CrNiN 23-4	1.4362	0.03	1.00	2.00	0.035	0.015	22.00 /24.00	0.10 /0.60	3.50 /5.50	0.10 /0.60	0.05 /0.20	-	Yes
X2CrNiMo N22-5-3	1.4462	0.03	1.00	2.00	0.035	0.015	21.00 /23.00	2.50 /3.50	4.50 /6.50	-	0.10 /0.22	-	Yes
X2CrNiMo N25-7-4	1.4410	0.03	1.00	2.00	0.035	0.015	24.00 /26.00	3.00 /4.50	6.00 /8.00	-	0.20 /0.35	-	Yes
X2CrNiMo CuWN25-7-4	1.4501	0.03	1.00	1.00	0.035	0.015	24.00 /26.00	3.00 /4.00	6.00 /8.00	0.50 /1.00	0.20 /0.30	W 0.50 /1.00	No

Chemical Compositions of Stainless Steel to EN 10217-7