Macroscopic mechanical properties of high-pressure alloy tubes and alloy tube indexes
The macromechanical performance index of high-pressure boiler steel pipe refers to the continuity, compactness and common reaction of metal microstructure. The formation of microstructure depends on the production process of smelting, rolling and heat treatment. The smelting process not only determines the steel grade. The chemical composition ratio also plays a crucial role in the purity of steel, the compactness and continuity of the original crystalline structure. The rolling process can improve the looseness, keyhole, segregation and Other defects in the smelting process to a certain extent, but it also forms rolling defects such as flying skin, rolling, cracks and the like due to specific deformation modes and improper production adjustment. Other organizational defects. The main purpose of the heat treatment process is to eliminate the structural defects formed by rolling, improve the state of the structure, and improve the macroscopic mechanical properties of the high-pressure alloy steel pipe . The rolling process can effectively break the dendrites, columnar crystals and fine internal cracks formed by casting; rolling reheating can improve the segregation of the cast structure, re-dissolve the carbon in the austenite, and ensure the carbon element by a proper heating system. Full spread. Online normalizing during the rolling process is a reliable process that has been experimentally verified. Therefore, we try to explore the online normalizing process route for the production of high-pressure boiler steel tubes by thermal expansion units, in order to improve the production efficiency of the thermal expansion unit and reduce the damage to the iron-based material structure caused by burning and repeated heating.
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