Chemical composition of valve steels to BS EN 10090

Introduction

BS EN 10090 is the material standard for valve steels and alloys.
Martensitic and austenitic steels are included. Most of these grades can also be classed as stainless steels by the definition given in BS EN 10088-1, which considers steels with minimum chromium (Cr) contents of 11.5% and maximum carbon (C) contents of 1.2% to be stainless steels. In BS EN 10088 however the primary purpose of the alloys is corrosion resistance, whereas in BS EN 10090 the elevated temperature strength and oxidation resistance are the main properties required of the steels listed here, in their intended applications.

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The data given is not intended to replace that shown in individual standards to which reference should always be made.

BS EN 10090 chemical composition tables

Designation Chemical composition (% by mass - max unless stated)
Steel name Steel number C Si Mn P S Cr Mo Ni Others
Martensitic steels
X45CrSi9-3 1.4718 0.40/0.50 2.70/3.30 0.60 0.040 0.030 8.00/10.00 - 0.50 -
X40CrSiMo10-2 1.4731 0.35/0.45 2.00/3.00 0.80 0.040 0.030 9.50/11.50 0.80/1.30 0.50 -
X85CrMoV18-2 1.4748 0.80/0.90 1.00 1.50 0.040 0.030 16.50/18.50 2.00/2.50 - V:0.30/0.60
Austenitic steels
X55CrMnNiN20-8 1.4875 0.50/0.60 0.25 7.00/10.00 0.045 0.030 19.50/21.50 - 1.50/2.75 N:0.20/0.40
X53CrMnNiN21-9 1.4871 0.48/0.58 0.25 8.00/10.00 0.045 0.030 20.00/22.00 - 3.25/4.50 N:0.35/0.50
X50CrMnNiNbN21-9 1.4882 0.45/0.55 0.45 8.00/10.00 0.045 0.030 20.00/22.00 - 3.50/5.50 W:0.80/1.50 Nb+Ta:1.80/2.50 N:0.40/0.60
X53CrMnNiNbN21-9 1.4870 0.48/0.58 0.45 8.00/10.00 0.045 0.030 20.00/22.00 - 3.25/4.50 Nb+Ta:2.00/3.00 N:0.40/0.60 C+N:0.90 min
X33CrNiMnN23-8 1.4866 0.28/0.38 0.50/1.00 1.50/3.50 0.045 0.030 22.00/24.00 0.50 7.00/9.000 W:0.50 N:0.25/0.35

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