Control method for inclusions in heavy rail steel

Abstract

The invention discloses a control method for inclusions in heavy rail steel. The method includes the following steps of converter smelting, ladle furnace (LF) refining, Ruhrstahl Heraeus (RH) vacuum treatment and continuous casting. According to the refining method, active lime is adopted in a converter, and active lime, silicon carbide and quartz sand are used for slagging in the refining process, so that the S content of molten steel is controlled to be reduced to below 0.006%, and it is guaranteed that all grades of the inclusions in the steel are lower than or equal to 2.0. According to the control method for the inclusions in the heavy rail steel, relatively high basicity is adopted, desulphurization efficiency is high and stable, and the method can obviously reduce various inclusions in the molten steel.

Description

Technical field

[0001] The invention relates to the technical field of steel smelting, in particular to a method for controlling heavy rail steel inclusions. Background technique

[0002] Steel rail is the main component of railway track. In the process of railway transportation, it provides effective support and guidance for the locomotive and needs to withstand the huge vertical pressure from the wheels. Based on the development needs of my country's infrastructure construction, railway transportation is developing at a rapid pace, and is constantly becoming high-speed and heavy-duty. This undoubtedly puts forward more stringent requirements on the quality of the rail. When the rail is in contact with the wheel, it is subjected to the reciprocating and variable load of the locomotive loop, and its purity has an important influence on the fatigue life of the rail.

[0003] Because the inclusions in the steel hinder the continuity of the steel matrix structure, the steel separate...