Fracture of High Frequency Straight Seam Welded Pipe

Fracture of high frequency straight seam welded pipe, hydraulic (pneumatic) parts used in the design of mechanical properties, brittle fracture and the use of components related to temperature.
 
It is found that when the temperature is lower than a certain temperature value, it is found that the data will change into brittle state, the impact absorption work decreased significantly, this phenomenon is called cold brittle, high-strength metal materials occurred in the low stress brittle fracture The organization of the data is far from uniform isotropic tissue will have cracks, there will be inclusions, pores and other defects, these defects can be seen as micro-cracks in the material. Therefore, the design should also be based on the operating temperature of the component to select the appropriate data of the cold and brittle transition temperature.
 
In general, it is assumed that the data is uniform and continuous isotropic. According to this method, the design is considered to be safe, and accidental breakage may occur. Due to defects such as cracks in the hot-rolled tube or high-precision cold drawn tube was made after the cylinder, cold-drawn seamless steel pipe. The use of the process of fracture, almost no plastic deformation occurs, are generally brittle fracture.
 
Brittle fracture is caused by a variety of reasons such as: grain boundary precipitates, regardless of its strength than the matrix strength of strong or weak, are the reasons for the occurrence of cracks; grain boundary inclusions segregation is the cause of fracture; In addition, Even in the far less than the yield limit of the alternating load, it will cause the occurrence of fatigue fracture phenomenon.