Control method for full-section homogeneity and rail web density of heavy rail steel

Abstract

The invention discloses a control method for full-section homogeneity and rail web density of heavy rail steel in the field of ferrous metallurgy. The method emphasizes on adopting the following stepsfor control in the continuous casting stage. In the steps, secondary cooling electromagnetic stirring is adopted in continuous electromagnetic stirring, the specific mounting position is in the section away from the molten steel face of a crystallizer by 5.0 m to 6.0 m, and the strength of a stirring magnetic field is controlled to range from 200*10-4 to 250*10-4; the superheat degree of castingmolten steel of a tundish is executed according to 35 DEG C to 45 DEG C; and the continuous casting secondary cooling water quantity is executed according to steel with the specific water flow rangingfrom 0.30 L/kg to 0.33 L/kg. Control is carried out according to above parameters, solidification structure components of a cast blank are controlled well, columnar crystals are quite developed, crystal rods are thin and dense, the zone area of isometric crystals (grains are short and crystal rods are thick) is reduced, the evolution of a C element segregation curve of the cast blank is gentle, no large-amplitude negative-positive segregation alternation happens, and the difference value of C element segregations degrees of a steel rail is small; and the full-section homogeneity of the steelrail is improved, rail web center segregation control is good, and density is improved.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for controlling the full-section homogeneity and rail waist density of heavy rail steel. Background technique [0002] Steel rails are the main components of railway tracks. During railway transportation, to provide effective support and guidance for locomotives, they need to bear huge vertical pressure from wheels. Based on the development needs of my country's infrastructure construction, railway transportation is developing at a rapid speed, and it is becoming more and more high-speed and heavy-duty. This undoubtedly puts forward more stringent requirements on the quality of rails. The improvement of rail quality is reflected in the quality control level of steel itself to a certain extent, such as high homogeneity, high cleanliness, and high compositional precision. Among them, the homogeneity of the rail (the smaller the degree of segregation, the higher t...

AI Technical Summary

Problems solved by technology

Among them, the homogeneity of the rail (the smaller the degree of segregation, the higher the homogeneity of the rail) affects the uniformity of the steel structure. Severe segregation will affect the welding performance of the rail parent material and the rail, and then affect the service and use of the rail.