Slant-insert type molten iron pretreatment lance and manufacturing method thereof

Abstract

The invention discloses a slant-insert type molten iron pretreatment lance and a manufacturing method thereof. The lance comprises a lance core steel tube, a refractory lance lining and a plurality of anchoring parts, wherein one end of the lance core steel tube is bent into the lance head; the refractory lance lining covers the outside surface of the lance core steel tube; and the anchoring parts are fixed on the outside surface of the lance core steel tube and positioned in the refractory lance lining; Axial reinforcing ribs are arranged at two sides of an axial section in the bending direction of the lance head on the outside surface of the lance core steel tube and are also covered in the refractory lance lining. The following steps are correspondingly added in the manufacturing method: clipping common carbon steel plates, polishing the two sides of the carbon steel plates into slants which are easy to weld to prepare the axial reinforcing ribs; and welding the axial reinforcing ribs at the two sides of the axial section in the bending direction of the lance head on the outside surface of the lance core steel tube. The lance is good in bending resistant effect, long in service life, good in injection pretreatment effect and simple in manufacturing process.

Description

technical field [0001] The invention relates to steelmaking equipment, in particular to an obliquely inserted molten iron pretreatment spray gun used on a torpedo tank mixed iron car and a manufacturing method thereof. Background technique [0002] At present, the pretreatment process of spray gun oblique insertion type molten iron injection has been widely used in torpedo tank mixed iron cars. When spraying pretreatment, the spray gun is inserted into the torpedo tank mixed iron car at an angle of 60° to the horizontal direction, and the solid pretreatment agent is sprayed into the depth of the molten iron through the carrier gas to complete the pretreatment of molten iron. In practical application, the hot metal pretreatment spray gun has the problems of serious damage and short service life. This problem greatly increases the cost of steelmaking, and due to the heavy weight of the spray gun, it is very inconvenient to replace. In this case, various methods have been devi...

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Problems solved by technology

[0004] However, this spray gun has not been effectively improved in terms of another major aspect that affects the service life of the spray gun, that is, the bending damage of the spray gun and the resulting problems such as tensile cracking, penetration, burning and peeling of the gun lining.

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