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Precise Cold-drawing Tube Peeling Reason And Control
Jun 12, 2018

1. Causes of Inclusion

Including the main chemical composition of the inclusions of oxygen, silicon, aluminum, calcium and other chemical elements, the main component is the mold roll slag. Inclusions are exposed to the surface of the steel plate for a long period of time during the rolling of the steel plate, causing peeling defects.

The root cause is still in the continuous casting process of cold-drawing pipe refining. By adjusting the chemical composition of steel grades, reducing the amount of protective gas, adopting a proper tundish nozzle insertion depth, a reasonable secondary cooling system, and replacing mold slag and The effective control of mold surface fluctuations and other means to optimize steelmaking and continuous casting processes have enabled this type of defects to be controlled, in which the effect of reducing total argon blowing at the nozzle during the continuous casting of cold drawn tubes on the inclusion or inclusions is most effective. .

2, the cause of the bubble

The main reason for the flaking defects of the cold-drawn tube bubble type is that the molten steel contains a relatively high content of gaseous elements. The molten steel accumulates on the surface of the steel sheet prior to the condensation and forms subcutaneous bubbles. During the rolling of the steel sheet, it undergoes pressurization. Finally, a skin defect was formed. It is generally believed that some cellular forms of bubbles are prone to occur during the hot rolling of steel sheets. The reason for the formation of bubbles is that some of the oxygen, hydrogen, nitrogen, carbon and other elements are abundant in the process of the steel tube condensation of the cold drawn tubes. The surface is enriched and bubbles form under certain conditions. The air bubbles on the surface of the steel are subjected to some forces during the rolling process and they are squeezed, resulting in skin defects.