Alloy Seamless Steel Pipe Crack

First, the production of steel pipe material inhomogeneity, we also need to know the steel pipe production of raw materials, if the procurement of raw materials, I do not carry a selection of material, probably inferior in the process of production of the raw materials can not withstand high temperatures due or high pressure, while there has been broken organization, naturally produced by the steel pipe in less than a slap on the quality standards. Secondly, the cooling process rushed, when finished steel pipe, usually involves a cooling process, if this time when rushed, yet inside steel tubes forming forging furnace was introduced in the cooling process occurs cracks. Finally, the pipeline contains too many bubbles, it will be used in welding to hydrogen, if there is no effective treatment methods, the hydrogen will be wrapped in the pipe to prevent the surface after a period of time there will be a breakage. So pass rate of steel pipe in the process of generating alloy seamless steel pipe, steel pipe must be forged on time and temperature required to install the operating standards so produced will increase. Blooming pass processing coupled with a greater rate, tube surface will significantly reduce the ripple of the intensity, the most vulnerable to crack source, if the rolling force exceeds the strength of the instant value of the material, the pipe will crack occurred here. Analysis shows that the characteristics of cold working, the cold rolling in the rolling grooves of each point on any section of the hole having different circumferential speeds, so that the positive and negative direction of travel of the pipe section are exposed to various stresses, in particular the amount of spread is larger hole, pipe to withstand tensile stress on the greater role in this uneven deformation under repeated, the more easy to crack, and the crack in the form mainly for horizontal crack, the crack length is shorter. With the decrease of the processing rate of cold rolling passes, especially in the final rolling, and said second processing rate becomes small, the rate of cracking of the pipe also will be smaller. Macroscopic morphology showed more cracks along the length of the longitudinal pipe cracking, similar to the length of the straight line and the longer the crack, located in the ends of the pipe, the middle rare. The trajectory is the mother of rubidium vapor piecemeal arrangements. It features a ballistic many branches, it is relatively simple bomb roads, heat morphology reported no differences, no realistic environment can by contraction and expansion, for all form a large compressive stress or tensile stress, causing all the advanced protection components. Protection alloy tube episodes are generally perpendicular to the maximum stress cross-section.