Comparison of the main schemes for processing steel reinforcement by alternating bending with tension

Cold Stretching with alternative bending (or SBR: Stretching, Bending with Rebending), a method of processing low-carbon hot-rolled reinforcement widely used abroad, allows to increase its mechanical properties to the next level according to GOST 34028-2016. For example, it becomes possible to increase the class of A400 reinforcement to the level of A500 properties by combining its stretching under a controlled degree of cold plastic deformation with the addition of alternating bending elements in special roller systems. The relative simplicity of this method significantly reduces production costs and also allows it to be implemented with various equipment schemes. The article presents a comparison of the stress-strain state of steel reinforcement during processing in key widely used equipment schemes for alternating bending with tension, used by the world’s major manufacturers. The comparison was made on the basis of finite element modeling in the SIMULIA Abaqus complex. A comparative analysis of longitudinal axial deformations and stresses arising in the reinforcement during processing is presented. Based on a comparison of key technological parameters and quantitative values of the parameters of the stress-strain state of the metal, it is shown that the considered schemes, taking into account their individual specifics, make it possible to quite flexibly adapt to the production needs of enterprises and the technological capabilities of the equipment in whose lines it is planned to introduce the SBR process. The study was supported by a grant from the Russian Science Foundation (agreement No. 23-29-10046 dated 04/20/2023, https://rscf.ru/project/23-29-10046/) and financial support from the Government of the Chelyabinsk Region (Agreement No. 164 dated 06/28/2024).