Packaging steel strip around with container to prevent brittle fracture properties

Packaging steel strip winding belt container to prevent brittle fracture properties of steel band wound pressure vessel wrong barrel length without deep weld, cylinder and department cant rely on weld connection at both ends. A novel structure, make the container has excellent brittle fracture prevention performance. This has been confirmed for the engineering application of long-term practice. Steel band wound pressure vessel wrong, even if the inner barrel crack exists, because has the following main advantages, also can ensure that the whole container brittle failure. Inner barrel uniform stress levels and the appropriate stress level is the important condition for the safe use of pressure vessel. As mentioned by fracture analysis shows that lower stress level has a significant effect on inhibition of crack propagation. By chapter 2, theoretical analysis and test made by previous studies show that prestressed steel strip winding will make the inner cylinder in axial and hoop by compression at the same time, also can use steel tape of prestressed test device to ensure uniformity of compression has certain, not ZhiYinQi stress concentration. Compression prestress and tensile stress caused by work stress superposition, inner barrel can still be at low stress levels, there is little possibility of crack crack. Flat steel belt mainly bear with long direction of tensile stress and radial compressive stress, and its thickness is thin, is advantageous to the materials for plastic flow; Crack is completely passivated, expand the extremely difficult. Inner cylinder and steel belt material to improve container material has excellent fracture toughness, this is to prevent the damage of container occurs brittle fracture a prerequisite. By the fracture analysis shows that improve the fracture toughness of material is to control the propagation of the crack has a significant impact. Multilayer binding materials for 4 - type container 12 mm steel sheet, the brittle transition temperature is low. Steel band wound pressure vessel wrong of the inner barrel of commonly used plastic good steel ( Its thickness is generally not more than 40 mm) , easy manufacturing, good quality and has good resistance to fracture. For example, had been 15 MNVR plates of different thickness of critical crack opening displacement ~ test, found that the thickness of fracture toughness is have a certain influence, in the material chemical composition and rolling state under the same conditions, plate, steel strip at the beginning of the fracture must the fracture toughness of high than thick base metal.