In recent years, at home and abroad gradually attach importance to the integrity of seamless pipe management concept, developed the relevant standards and norms. The probability of the fracture produced by the straight seam welded pipe is the main need to pay attention to, the seam welded pipe fracture, hydraulic parts in the design of the use of mechanical properties, brittle fracture and the use of components related to the temperature.
Through the study found that when the temperature is lower than a certain temperature value, the metal material will gradually change into a brittle state, the impact absorption power decreased significantly, this phenomenon known as cold brittle, this situation is likely to cause straight seam welded pipe production fracture, affecting production and processing. Therefore, the design should also be based on the work of the component temperature to select the appropriate cold brittle transition temperature of the material.
In general, it is assumed that the material is evenly considered safe design, and sometimes accidental fracture accidents occur. As the hot-rolled tube billet cracks or other defects or high-precision cold-drawn tube was made after the cylinder, straight seam steel pipe when cold. The use of the process of the fracture occurred, almost no plastic deformation occurs, are generally brittle fracture.
