Technical size installation, thereby reducing processing steps and processing costs. Recently, Maanshan Iron and steel rolling plant in a new product Q235qD board Q345qD two kinds of bridges with steel and pass certification, which marks the plate factory since last April after successfully rolling out a new 25MN steel products. Faced with the grim situation in the steel market complex, a steel rolling plant innovation, and strive to develop new products Q235qD and Q345qD, to meet market and customer needs. In order to ensure product quality and performance requirements, the use of tube steel laminar cooling system for cooling, water cooling plate to ensure open after straightening temperature controlled at about 720 ℃, stable stacking of finished steel storage requirements, dispersion, avoid high temperature deformation, the entire rolling stable system process smooth, shape control and stability, good surface quality defect, the performance indicators are in line with technical requirements. High penetration of low carbon manganese steel, steel similar performance on the 15th, good welding performance, but hardenability, strength and plasticity of steel are higher than those on the 15th for a higher portion of the manufacturing center of the mechanical properties required and the need carburizing parts. When stress is applied simultaneously with the corrosion that can accelerate the destruction of the metal. In the simplest of quiet conditions, due to the damaging effects of these two homes just Tengah's. If the etching is uniform, the cross-sectional area gradually decreases gradually increased so that the true stress, the fracture strength of the material ultimately fracture. If intergranular corrosion, the binding force between grains will be reduced, so that the applied stress is more corrosive further damage along the grain boundaries, and finally to the residual intergranular binding force can no longer withstand the applied stress caused the fracture. For both simple and stress corrosion in case, you can take increased material size (or use a more corrosion resistant materials) and to prevent intergranular corrosion to resolve. However, commonly referred to as' the narrow) Stress corrosion is a complicated phenomenon: when the stress is not present, little recovery rot; stress is applied after the latter period, the metal corrosion is not serious in the case. brittle fracture. This stress corrosion cracking has the following three common characteristics: first stress is generally stretched; tensile stress greater the shorter the break. Residual stress after cold working brass yield strength can be achieved. Eliminate stress annealing treatment is the first effective measures to control stress corrosion cracking. Use rolling, shot peening, milling and other measures. Compressive stress of the surface layer. You can reduce the stress corrosion cracking tendency. Second. Corrosive medium is specific only certain combinations of a metal medium, will produce stress corrosion cracking. E.g. nitrogen brittle brass (season cracking), shouting boiler steel brittle, brittle carbon nitrate pot, high Hydrogen Embrittlement strength, austenitic stainless steel brittle like grip. Third, the fracture rate (0.001-0.3 an / h) no corrosion damage is much greater than the speed under stress, but less than the speed of a simple fracture mechanics. Belong to brittle fracture fracture type. This is stress, corrosion and stress corrosion cracking of three common characteristics of fracture. The first is when the production and use of metal materials from the point of view of the development process of stress corrosion cracking problem, especially after the occurrence of a major accident. Analysis of relevant personnel to find out the appearance of law and control measures and further study of the mechanism of. In order to reveal the details of the process of law and assessment experience and intrinsic causal link. With metal material for wider areas (such as atomic energy, Yu dirty, deep, new chemicals, etc.). With the emergence of environmental pollution, have emerged in the new issue of stress corrosion cracking. Encourage people to study, while new research work of its emergence. Also helps to understand the depth of this problem. 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