Investigation on the Causes of Abnormal Fracture of High-Strength Steel Wire

The cause of abnormal fracture of 55SiCr high-strength steel wire rods during storage was analyzed for macroscopic and microscopic morphology, chemical composition, microstructure, mechanical properties and hydrogen content of the sample and the experiment of the hydrogen-charging fracture under the action of pre-stress. Results show that the fracture of 55SiCr high-strength steel wire rods has nothing to do with the chemical composition and the process technology such as heat treatment, but was related to scratch defects on the surface, the tensile stress and the hydrogen environment during the production, which led to hydrogen-induced cracking first, and eventually fracture.