The General Tensional Relaxation Properties of a Bolting Steel

Abstract

One objective of the investigation reported in the paper was to measure the tensional relaxation properties of a Cr-Mo-Si-Va commercial high-temperature bolting at 1000 F under varying conditions of follow-up by means of the step-down relaxation test. To this end certain necessary assumptions were made relative to high-temperature behavior, which were checked for validity by means of a true relaxation test, with a particular value of elastic follow-up, carried out in a Barr and Bardgett test unit. Comparison of these results with the results of the step-down test at the same value of elastic follow-up gives a partial evaluation of the assumptions inherent in the latter testing method.