4903Steel for Pressure Vessels and Boilers
SIQUAL 4903 is a chromium-molybdenum alloy steel intended for welded boilers and pressure
vessels designed for elevated temperature service. It can be certified as steel grade X10CrMoVNb9-1
according to EN standard and SA 387 GR 91 CL 2 according to ASME standard.
SIQUAL 4903 data sheet
President & CEO
Andrew Towey
Company Management
SIJ Americas
Manufacture
SIQUAL 4903 is made by SIJ Acroni.
For exact values of physical properties, please consult the datasheet or contact our sales team.
Standards & certificates
Material number
1.4903
EN
X10CrMoVNb9-1
ASME
SA 387 Gr. 91 Cl. 2
Chemical composition
In weight %
C0.08 - 0.12
Si0 - 0.50
Mn0.30 - 0.60
P0 - 0.020
S0 - 0.005
Al0 - 0.04
N0.03 - 0.07
Cr8 - 9.5
Cu0 - 0.30
Mo0.85 - 1.05
Nb0.06 - 0.10
Ni0 - 0.30
Ti0 - 0.05
V0.18 - 0.25
Product forms
Disclaimer
The information and data presented herein are typical or average values. The typical properties of the materials described are provided solely to assist readers in making their own evaluations and decisions. These values are not guaranteed.
Applications specifically suggested for the materials described are intended only for illustrative purposes, enabling the reader to make their own assessments. They are not to be construed as warranties, whether express or implied, regarding fitness for any particular purpose.
The information and data are provided for informational purposes only and may be revised at any time without notice.
Unless otherwise specified, all registered trademarks are the property of SIJ – Slovenska industrija jekla, d.d. (Slovenian Steel Group) and its subsidiaries (SIJ Group).
Copyright © 2024 by SIJ Group. All rights reserved. Contact us for further information.
Applications specifically suggested for the materials described are intended only for illustrative purposes, enabling the reader to make their own assessments. They are not to be construed as warranties, whether express or implied, regarding fitness for any particular purpose.
The information and data are provided for informational purposes only and may be revised at any time without notice.
Unless otherwise specified, all registered trademarks are the property of SIJ – Slovenska industrija jekla, d.d. (Slovenian Steel Group) and its subsidiaries (SIJ Group).
Copyright © 2024 by SIJ Group. All rights reserved. Contact us for further information.
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President & CEO
Andrew Towey
Company Management
SIJ Americas