Method for improving billet descaling effect

A high-pressure water descaling and steel billet technology, which is applied in the field of steel billet rolling, can solve problems such as iron oxide scale not considered, achieve the effect of reducing rail surface quality problems and improving phosphorus removal effect

Pending Publication Date: 2021-04-30
HANDAN IRON & STEEL GROUP +1
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  • Abstract
  • Description
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  • Application Information

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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

Method used

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  • Method for improving billet descaling effect

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Experimental program
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Effect test

Embodiment 1

[0031] Before the high-speed heavy rail steel billet is heated in the heating furnace, the anti-oxidation coating is sprayed on the upper surface and two sides of the billet, and the thickness of the coating is 0.25mm. Heating in the heating furnace. After entering the furnace, the temperature of the preheating section is 910°C, the temperature of the heating section is 1178°C, the temperature of the soaking section is 1245°C, the residual oxygen in the furnace is 2%, and the heating time is 4.5h. After being heated by the heating furnace, the surface The thickness of the oxide scale is 1.5mm. After the steel billet leaves the heating furnace, it is descaled by high-pressure water, and the high-pressure water is sprayed obliquely to remove the oxide scale on the surface of the billet. °, the high-pressure water pressure is 22 MPa, which can remove 90% of the oxide scale on the surface of the high-speed heavy rail billet.

Embodiment 2

[0033]Before the high-speed heavy-rail steel billet is heated in the heating furnace, the anti-oxidation coating is sprayed on the upper surface and two sides of the billet. The coating thickness is 0.3mm. The two end faces and the lower surface of the billet are not sprayed with anti-oxidation coating. Heating in the heating furnace. After entering the furnace, the temperature of the preheating section is 920°C, the temperature of the heating section is 1149°C, the temperature of the soaking section is 1240°C, the residual oxygen in the furnace is 1.5%, and the heating time is 6.4h. After being heated by the heating furnace, the surface The thickness of the oxide scale is 1.3 mm. After the steel billet leaves the heating furnace, it is descaled by high-pressure water, and the high-pressure water is sprayed obliquely to remove the oxide scale on the surface of the billet. °, the high-pressure water pressure is 20 MPa, which can remove 92% of the oxide scale on the surface of th...

Embodiment 3

[0035] Before the high-speed heavy rail steel billet is heated in the heating furnace, the anti-oxidation coating is sprayed on the upper surface and two sides of the billet, and the thickness of the coating is 0.35mm. Heating in the heating furnace. After entering the furnace, the temperature of the preheating section is 930°C, the temperature of the heating section is 1223°C, the temperature of the soaking section is 1250°C, the residual oxygen in the furnace is 3%, and the heating time is 5.5h. After being heated by the heating furnace, the surface The thickness of the oxide scale is 0.8mm. After the billet leaves the heating furnace, it is descaled by high-pressure water, and the high-pressure water is sprayed obliquely to remove the oxide scale on the surface of the billet. °, the high-pressure water pressure is 19MPa, which can remove 96% of the oxide scale on the surface of the high-speed heavy rail billet.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/00B21B45/08
CPCB21B45/004B21B45/08
Inventor 李耀强武东东李玉谦李钧正韩志杰张海旺杨正宗
Owner HANDAN IRON & STEEL GROUP
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