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6d. Chemical composition of valve steels to BS EN 10090

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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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