After a period of time, a lot of straight seam steel pipe fracture happens, in general, all data is assumed to be uniform isotropic continuous analysis according to this method is safe design, breakage sometimes unexpected accidents. As hot-rolled tube defects such as cracks or high-precision cold drawn tube is made after the tank, cold drawn seamless when. Breakage occurs during use, almost no plastic deformation occurs, in general are brittle fracture.
Longitudinal fracture, hydraulic (pneumatic) parts used in the design of mechanical properties, but also with members of brittle fracture with temperature. Brittle fracture caused by a variety of reasons, such as: precipitates on the grain boundaries, regardless of the intensity ratio of the matrix strength strong or weak, are all causes cracks; grain boundary segregation of inclusions also cause fracture; addition, even in far less than the yield limit alternating loads can also cause fatigue fracture phenomena.
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