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The difference of metallurgical structure control between steel sheet and steel bar
- Dec 26, 2017 -

The steel plate and the slab are controlled by the multiphase structure of ferrite, Bainite, martensite and residual austenite to meet the requirements. The rods are much needed for quenching and tempering steels. such as carburizing steel, the key is how to use carburizing quenching to obtain strong toughness and good single soma. The structural levels of martensite in the original austenite grains are martensite block, martensite bundle and martensitic lath. The results of analysis of early fracture parts caused by bending fatigue and impact load show that the fracture starting point is: 1 incomplete quenching microstructure (soft ferrite, pearlite) and 2 weak part of local grain coarsening. The most effective method to improve the various strength of carburized steel is to make the microstructure of carburized steel homogeneous fine grained martensite. If from the gear used in the automobile, the construction machinery, the processing machinery (transmission, etc.), the steel of the rotating shaft, the bar is difficult to plate. Taking carburizing Steel as an example, the carbon content of carburized steel is 0.15%-0.25%, because the surface of carburized steel is hardened by carburizing, quenching and tempering, and the wear resistance and fatigue strength of the parts are improved, meanwhile, the components have good toughness because of low carbon content in the core of the parts (non carburizing layer).


Carburizing Steel production is representative of the driving components, the speed changes in the car and engine torque changes in the transmission gear and rotation shaft, as well as when the car steering, so that the left and right wheels produce a difference in the number of differential gears, these are in the car is playing an important part of the driving, The attributes required for these parts depend on the working conditions of the part.