EN 10302 Chemical Composition of Creep Resisting Steel

EN 10302 is the material standard for creep resisting steel, nickel and cobalt alloys in bar, rod and flat product forms. Martensitic and austenitic steel are included. Most of these grades can also be classed as stainless steel by the definition given in EN 10088-1, which considers steel with minimum chromium (Cr) contents of 11.5% and maximum carbon (C) contents of 1.2% to be stainless steel.

In EN 10088 however the primary purpose of the alloys is corrosion resistance, whereas in BS EN 10302 the elevated temperature strength and oxidation resistance are the main properties required of the steel listed here, in their intended applications.

The latest 2008 edition has some minor changes:

Most Chromium and Nickel ranges are now quoted to only 1 decimal place compared to 2 in the previous edition

The P and S contents for grade 1.4922 have been lowered

There is one new grade 1.4951 a 310 type with a minimum Ni content

These changes are shown in bold in the table below.

Designation		Chemical composition (% by mass - max unless stated)
Steel name	No.	C	Si	Mn	P	S	N	Al	Cr	Mo	Nb	Ni	Ti	V	W	Other
Martensitic Steel
X10CrMo VNb9-1	1.4903	0.08 /0.12	0.5	0.30 /0.6	0.025	0.015	0.030 /0.07	0.030	8.0 /9.5	0.85 /1.05	0.060/ 0.10	0.40	-	0.18/ 0.25	-	-
X11CrMo WVNb9-1-1	1.4905	0.09 /0.13	0.1 /0.5	0.30 /0.6	0.020	0.010	0.050 /0.09	0.040	8.5 /9.5	0.90 /1.1	0.06/ 0.10	0.10 /0.40	-	0.18/ 0.25	0.90/ 1.10	B: 0.0005 /0.005
X8CrCoNi Mo10-6	1.4911	0.05 /0.12	0.10 /0.8	0.30 /1.3	0.025	0.015	0.035	-	9.8 /11.2	0.50 /1.0	0.20/ 0.50	0.20 /1.20	-	0.10/ 0.40	0.70	B:0.005 / 0.015 Co:5.00 /7.00
X19CrMo NbVN11-1	1.4913	0.17 /0.23	0.5	0.40 /0.9	0.025	0.015	0.050 /0.10	0.020	10.0 /11.5	0.50 /0.8	0.25/ 0.55	0.20 /0.60	-	0.10/ 0.30	-	B: 0.0015
X20CrMo V11-1	1.4922	0.17 /0.23	0.5	1.00	0.025	0.015	-	-	10.0 /12.5	0.80 /1.2	-	0.30 /0.80	-	0.25/ 0.35	-	-
X22CrMo V12-1	1.4923	0.18 /0.24	0.5	0.40 /0.9	0.025	0.015	-	-	11.0 /12.5	0.80 /1.2	-	0.30 /0.80	-	0.25/ 0.35	-	-
X20CrMo WV12-1	1.4935	0.17 /0.24	0.10 /0.5	0.30 /0.8	0.025	0.015	-	-	11.0 /12.5	0.80 /1.2	-	0.30 /0.80	-	0.20/ 0.35	0.40/ 0.60	-
X12CrNi MoV12-3	1.4938	0.08 /0.15	0.5	0.40 /0.9	0.025	0.015	0.020 /0.04	-	11.0 /12.5	1.50 /2.0	-	2.00 /3.00	-	0.25/ 0.40	-	-
Austenitic Steel
X3CrNiMo BN17-13-3	1.4910	0.04	0.75	2.00	0.035	0.015	0.10 /0.18	-	16.0 /18.0	2.00 /3.0	-	12.0 /14.0	-	-	-	B: 0.0015 /0.005
X6CrNiMo B17-12-2	1.4919	0.04 /0.08	1.0	2.00	0.035	0.015	0.11	-	16.5 /18.5	2.00 /2.5	-	10.0 /13.0	-	-	-	B: 0.0015 /0.005
X6CrNiTi B18-10	1.4941	0.04 /0.08	1.00	2.00	0.035	0.015	-	-	17.0 /19.0	-	-	9.0 /12.0	5xC/ 0.80	-	-	B: 0.0015 /0.005
X6CrNiW NbN16-16	1.4945	0.04 /0.10	0.30 /0.6	1.50	0.035	0.015	0.06/ 0.14	-	15.5 /17.5	-	10xC/ 1.20	15.5 /17.5	-		2.50/ 3.50	-
X6CrNi 25-20	1.4951	0.04 /0.08	0.70	2.00	0.035	0.015	0.10		24.0 /26.0			19.0 /22.0
X5NiCrAl Ti31-20	1.4958	0.030 /0.08	0.70	1.50	0.015	0.010	-	0.20/ 0.50	19.0 /22.0	-	0.10	30.0 /32.5	0.20/ 0.50	-	-	Cu:0.50
X8NiCrAl Ti32-21	1.4959	0.05 /0.10	0.70	1.50	0.015	0.010	-	0.20/ 0.65	19.0 /22.0	-	-	30.0 /34.0	0.25/ 0.65	-	-	Cu:0.50
X8CrNiNb 16-13	1.4961	0.04 /0.10	0.30 /0.6	1.50	0.035	0.015	-	-	15.0 /17.0	-	10xC/ 1.20	12.0 /14.0	-	-	-	-
X12CrNiW TiB16-13	1.4962	0.07 /0.15	0.50	1.50	0.035	0.015	-	-	15.5 /17.5	-	-	12.5 /14.5	0.40/ 0.70	-	2.50/ 3.00	B: 0.0015 /0.006
X12CrCoNi 21-20	1.4971	0.08 /0.16	1.00	2.00	0.035	0.015	0.10 / 0.20	-	20.0 /22.5	2.50 /3.5	0.75/ 1.25	19.0 /21.0	-	-	2.00/ 3.00	Co: 18.50 /21.00
X6NiCrTiMo VB 25-15-2	1.4980	0.030 /0.08	1.00	1.00 /2.0	0.025	0.015	-	0.35	13.5 /16.0 >	1.00 /1.5	-	24.0 /27.0	1.90/ 2.30	0.10/ 0.50	-	B: 0.0030 /0.010
X8CrNiMo Nb16-16	1.4981	0.04 /0.10	0.30 /0.6	1.50	0.035	0.015	-	-	15.5 /17.5	1.60 /2.0	10xC/ 1.20	15.5 /17.5	-	-	-	-
X6CrNiMoTi B17-13	1.4983	0.04 /0.08	0.75	2.00	0.035	0.015	-	-	16.0 /18.0	2.00 /2.5	-	12.0 /14.0	5xC/ 0.80	-	-	B: 0.0015 /0.006
X8CrNiMoV Nb16-13	1.4988	0.04 / 0.10	0.3 /0.6	1.50	0.035	0.015	0.06/ 0.14	-	15.5 /17.5	1.10 /1.5	10xC/ 1.20	12.5 /14.5		0.60/ 0.85	-	-