High-strength hot-rolled I-beams for the construction industry

Abstract

It is possible to produce hot-rolled I-beams characterized by high strength and excellent performance. The basic chemical composition of the steel required, the corresponding smelting conditions, and the rolling technology are presented. The results of tensile tests and the impact strength of the I-beams are considered. The welding properties of the metal are assessed: the strength and cold strength of the weld joints and the susceptibility to laminar and cold cracking. The requirements on the microstructure of the I-beams to prevent brittle failure are outlined. The I-beams produced from the new steel may be used in the construction of mass-produced buildings and also in one-off structures.