Influence of expansion level on base metal mechanical properties of welded straight seam L450M steel pipes

Authors:
Publisher website
Google Scholar
Abstract
The technological operation of expansion in the range of e = 0–1.2% has a negligible effect on the standard mechanical characteristics of the base metal of straight-seam welded pipes made of L450M steel. The tensile strength practically does not change, and the yield strength decreases by approximately 6% in comparison to the base metal of the unexpanded pipe. At the same time, the relative elongation and relative area reduction decrease by 6–8% with an increase in the expansion level. It is found that the impact toughness KCV of the base metal in straight-seam welded pipes is more sensitive to changes in the expansion level, and at e = 1.2% it increases by approximately 11% compared to the unexpanded pipe.