In 1962 the Subcommittee on Thermal and Mechanical Treatments of the Pressure Vessel Research Committee's Fabrication Division initiated a project at Lehigh University to study the stress-rupture properties of quenched-and-tempered pressure vessel steels. The program was to include materials which were either then being used or potentially useful at service temperatures up to and including the threshold of the creep range. The investigation continued for five years, during which a number of aspects pertaining to the stress-rupture properties of the steels were studied and a large volume of data was generated. From time to time in the course of the work reports were made of the results but in most cases the data were condensed to fit into the normal space limitations of published papers. Therefore, it seemed appropriate at the conclusion of the program to prepare a final compilation of the data obtained during the entire investigation in a form that would be readily useful to engineers and designers. This report is intended to provide such a compilation. Since this is a data summary, there will be no discussion of the figures presented here. An evaluation of these data has been made in the most recently published paper on the program, and those interested in an overview of the investigation are referred there.
The data presented covered a wide range, including twelve steels in the as-heat treated condition, the welded condition, the notched condition, and the welded and notched condition. The conditions used varied from steel to steel according to the purposes of the program so data are not available for all the steels in all conditions. However, for some steels, i.e., A517F, A533A, and A542, a complete set of the conditions included in the program were tested. At this point a word of caution should be expressed concerning the use of the data. From the outset, it was not the purpose of the investigation to test every steel in every condition, but rather to characterize the stress-rupture behavior of this class of steels. Thus, it was not the intent of the program to produce design data for specific materials. For this reason most of the test data are for short time periods only (generally less than 5000 hr.) and extrapolation of the data to long time periods for design purposes cannot be recommended.
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| Number of Pages : | 22 |
| Published : | 1968 |
