Method for improving billet descaling effect

Abstract

The invention discloses a method for improving the billet descaling effect. After a billet is taken out of a heating furnace, oxide scales on the surface of the casting billet are removed through high-pressure water descaling and high-pressure water inclined spraying, the inclination angle alpha between the high-pressure water spraying direction and the surface of the casting billet ranges from 30 degrees to 60 degrees, and the high-pressure water pressure ranges from 15 MPa to 22 MPa. The thickness range of oxide scales on the surface of the casting billet discharged from the furnace is controlled to be 0.5 mm-1.5 mm, the oxidation burning loss rate of the surface of the casting billet is greatly reduced by 50% or above, the oxide scales on the surface of the casting billet are removed through high-pressure water inclined spraying, the phosphorus removal effect reaches 90%-98% and is improved by 13%-15% compared with a traditional phosphorus removal method, the steel rail surface quality problem caused by incomplete phosphorus removal is greatly solved, and the high-speed heavy rail phosphorus removal effect is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of billet rolling, and in particular relates to a method for improving the descaling effect of billets. Background technique [0002] In recent years, domestic high-speed railways have achieved leapfrog development. With the opening of Fuxing, the prominent position of China's railways in the world has become more stable. At the same time, domestic requirements for rail base materials for high-speed railways are becoming more and more stringent. At present, when domestic rail manufacturers produce high-speed heavy rails, they generally implement a system of spraying anti-oxidation coatings on the surface of cast billets, focusing on reducing the decarburization layer of rail treads. The indirect relationship between the anti-oxidation coating and the surface quality of the rail is ignored. One of the important indicators that distinguishes high-speed heavy rails from ordinary-speed heavy rails is the surfac...

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent application number 201721250017.8 discloses "a device for quickly clearing the surface oxide scale of heavy rail steel slabs". In its application method, devices such as friction discs, drive motors, and levers are used to target Rapid surface oxide scale, the focus is on removing the oxide scale formed on the surface after steelmaking pouring and molding, without considering the newly formed oxide scale on the surface of the heavy rail billet heated for a long time in the heating furnace

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