what is cold drawn tube fracture

When steel tube cold drawn process, because the hot rolled steel pipe has cracks defects or high precision cold drawn pipe is made into oil tanker, the cold drawn tube fracture will occur in the using process. This fracture is usually brittle fracture. There is a variety of reasons to cause the brittle fracture. For instance, whatever the strength of is stronger or weaker than the matrix strength, grain boundary precipitates are all caused the cold drawn tube crack. In addition, even though, far less than under limited the alternating load will cause the fatigue fracture phenomenon.

The Common Cold Drawn Tube Fracture


Generally speaking, hydraulic parts adopt mechanical performance index during the design process, so it is assumed that the material is uniform, continuous and isotropy. Although this analysis method is considered safe design, fracture accidents happen at times. The research finds that the material organization is far from uniform and isotropic in the process of high strength metal material occurring low stress brittle fracture. The material organization has following defects like crack, inclusions and porosity. These defects can be as the micro cracks of material.

Furthermore, brittle fracture is associated with the temperature of components. Technician found by the study that when the temperature is below a certain value, the material will change into brittle state. This will lead to the shock absorption function declining obviously, which is called cold short. Therefore, the design of cold drawn tube is based on the components of working temperature to select the proper ductile brittle transition temperature of materials.