Estimation of Delayed Fracture Property of Steels

Abstract

A new testing method was developed which enables to quantify minute amount of hydrogen in steel and measure resistance of steel to delayed fracture. This method clarified a steel had critical hydrogen level (H_T) for delayed fracture under a constant applied load. Based on this testing method, a new approach for estimating delayed fracture of steel in service was proposed. From the value of H_T obtained by this testing method, together with amount of hydrogen absorbed in the steel in a service environment, which is measured by a hydrogen monitoring device, delayed fracture of steel in service can be estimated.