HB7, an ultra-clean, high strength pressure vessel steel manufactured in France, is compared to A723 steel. This steel, suggested as an improved pressure vessel material is currently being proposed for critical applications, and will likely be used more frequently as design engineers discover its capabilities. This paper includes comparisons of strength, fracture toughness, fatigue properties and composition of the two steels, followed by an in-depth comparison and modeling of environmental cracking resistance, Bauschinger-modified residual stresses and fatigue lives. Results indicate that in all critical areas, with the exception of Bauschinger-reduced residual stress, the HB7 is superior to the A723 steel. Particularly for small amounts of autofrettage, near-bore residual stresses are reduced for HB7 steel compared to those for A723 steel at the same strength level. The greatest improvement of the HB7 over the A723 is in environmental cracking resistance. The HB7, when tested in concentrated sulfuric acid, exhibits five orders of magnitude longer crack incubation times and three orders of magnitude slower crack growth rates, when compared to A723 steel at the same strength level.
Skip Nav Destination
Article navigation
November 2004
Research Papers
Mechanisms and Modeling Comparing HB7 and A723 High Strength Pressure Vessel Steels
E. Troiano,
E. Troiano
US Army RDT&E Center Watervliet, NY 12189-4050
Search for other works by this author on:
A. P. Parker,
A. P. Parker
Cranfield University, Swindon, SN6 8LA UK
Search for other works by this author on:
J. H. Underwood
J. H. Underwood
US Army RDT&E Center Watervliet, NY 12189-4050
Search for other works by this author on:
E. Troiano
US Army RDT&E Center Watervliet, NY 12189-4050
A. P. Parker
Cranfield University, Swindon, SN6 8LA UK
J. H. Underwood
US Army RDT&E Center Watervliet, NY 12189-4050
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division August 4, 2004; revision received August 11, 2004. Review conducted by: S. Zamrik.
J. Pressure Vessel Technol. Nov 2004, 126(4): 473-477 (5 pages)
Published Online: December 1, 2004
Article history
Received:
August 4, 2004
Revised:
August 11, 2004
Online:
December 1, 2004
Citation
Troiano, E., Parker, A. P., and Underwood, J. H. (December 1, 2004). "Mechanisms and Modeling Comparing HB7 and A723 High Strength Pressure Vessel Steels ." ASME. J. Pressure Vessel Technol. November 2004; 126(4): 473–477. https://doi.org/10.1115/1.1811108
Download citation file:
Get Email Alerts
The Behavior of Elbow Elements at Pure Bending Applications Compared to Beam and Shell Element Models
J. Pressure Vessel Technol (February 2025)
Related Articles
Stress and Fracture Analysis of Ceramic Lined, Composite or Steel Jacketed Pressure Vessels
J. Pressure Vessel Technol (November,2004)
Effect of Loading Rate on Fracture Toughness of Pressure Vessel Steels
J. Pressure Vessel Technol (May,2000)
A Re-Autofrettage Procedure for Mitigation of Bauschinger Effect in Thick Cylinders
J. Pressure Vessel Technol (November,2004)
Autofrettage and Reautofrettage of a Spherical Pressure Vessel
J. Pressure Vessel Technol (February,2007)
Related Proceedings Papers
Related Chapters
Materials
Power Boilers: A Guide to the Section I of the ASME Boiler and Pressure Vessel Code, Second Edition
New Guidelines on Assessing the Risk of Fatigue Failure and Remaining Life of Ageing Pressure Vessels:
Ageing and Life Extension of Offshore Facilities
Design and Life Prediction of Cr-Mo Steel Pressure Vessel for Next Generation Fuel-Cell Forklift Truck
International Hydrogen Conference (IHC 2016): Materials Performance in Hydrogen Environments