The invention relates to a sliding closure (10) for a metallurgical vessel comprising a tapping hole (1) for draining metal melt or slag, said sliding closure being provided with a slider housing (3) that can be secured to the vessel (2) and a closure plate (6) that can move therein for opening and closing the tapping hole (1). The sliding closure (10) also has only this moveable closure plate (6), without a stationary closure plate, which is can be moved directly on a sliding surface (7), extending around the tapping hole, preferably of a casing block (9) in the vessel (2) and can be pressed by pretensioning elements. In this way, this sliding closure (10) provides a constructionally simpler structure and user-friendly handling.

An immersion probe with a variable connection length is configured to compensate for longitudinal and/or radial length variations in an immersion sublance connected to the immersion probe. The immersion probe is characterized by an adjustable portion that changes length upon engagement with a coupling end of an immersion sublance. The immersion probe can have a sensor head. An immersion assembly of the immersion probe connected to an immersion sublance can be used to take measurements or samples of molten metal in a converter furnace.

A melting pot includes a pot body and a float salvaging apparatus. The pot body is provided with a melting chamber having an open upper end. The float salvaging apparatus includes a hanging bracket, a bearing plate, a rotating plate and a drive assembly configured to drive pivoting of the rotating plate. The hanging bracket is disposed above the melting chamber. The rotating plate is pivotably disposed on the bearing plate, and the bearing plate and the rotating plate are provided on the hanging bracket between an initial position and a first salvaging position in a manner of moving up and down. The drive assembly is connected to the rotating plate.

A coaxial dual supersonic oxygen flow cluster oxygen lance comprises an inner layer circular-hole supersonic nozzle assembly, an outer layer water-cooled casting assembly, and a middle layer annular-hole supersonic nozzle assembly arranged between the inner layer circular-hole supersonic nozzle assembly and the outer layer water-cooled casting assembly, wherein the circular-hole supersonic assembly generates a first beam of supersonic oxygen jets and the annular-hole supersonic assembly generates a second beam of supersonic oxygen jets surrounding the first beam of supersonic oxygen jets; and the second beam of supersonic oxygen jets and the first beam of supersonic oxygen jets are in the same direction, and the two beams of supersonic oxygen jets are independently supplied with gas, and are independently adjusted. The oxygen lance can form coaxial dual supersonic oxygen flow, can flexibly adjust the flow of the oxygen lance under the condition of supersonic jets, and can meet the different requirements of an electric furnace at high steel scrap ratio for an oxygen system during smelting periods at different working conditions, thereby improving smelting efficiency of the electric furnace, reducing consumption and shortening smelting periods.

The present invention concerns a lance composed of a top lance (1t) and of a sublance (2) coupled to the top lance (1t), which forms a shoulder (1s) between the top lance and the sublance. The sublance (2) of the present invention is provided with a protective device (3) comprising a coupling end (2c) opening to the cavity (2v), wherein, when at rest, the protective device (3) is in an initial configuration characterized by an outer maximum diameter (D3o) which is not more than 10% larger than the diameter (D2) of sublance (2) (D3o≤1.1 D2), when the sublance (2) is coupled to the lance the protective device (3) contacts the shoulder (1s) and is deformed into a deformed configuration, forming a surface impervious to molten metal and slag, which spans over a whole area of the shoulder (1s).

A steel making assembly comprising a metal, refractory lined vessel having a side wall with a taphole therein and a metal plug placed within the taphole. The metal plug comprises a frustoconical body having a side conical wall, a closed small end and an open large end thereof defining an essentially empty interior space. The side conical wall of the frustoconical body of the plug includes at least one diagonal compression slit. The at least one diagonal compression slit extends from the open large end of the frustoconical body and extends toward the closed small end of the frustoconical body. The conical wall has a center axis, with the at least one diagonal compression slit being non-parallel to the center axis.

A converter includes a container and a supporting ring. A suspension device for the converter has a central structure fixed to the container. A first lateral structure is arranged at a first side of the central structure and fixed to a surface of the supporting ring. A second lateral structure is oppositely arranged. First and second sliding blocks are respectively connected with the first and second lateral structure. A first contact body is connected with the central structure by a first threaded bolt which engages a threaded hole in the central structure and a threaded hole in the first contact body. A second contact body is connected with the central structure by a second threaded bolt which engages a threaded hole in the central structure and a threaded hole in the second contact body. A distance element is arranged between the central structure and the first and/or second contact body.

The present disclosure provides a converter CO.sub.2—O.sub.2 mixed injection smelting method and a fire point area temperature dynamic control method. The method realizes online monitoring through an infrared temperature sensor installed inside an oxygen lance, dynamically adjusts the mixing ratio of CO.sub.2 and O.sub.2 and the height of the oxygen lance position according to the fire point area temperature changes and process requirements in different smelting stages, so that the secondary smelting system interlockingly and dynamically controls the fire point area temperature and the molten pool heating rate.

A metallurgical furnace cooling plate includes a cooling plate body with front and rear faces and at least one coolant channel inside the body, which communicates with a rear opening on the rear face; and a connection pipe connected to the body so that a pipe channel of the connection pipe communicates with the coolant channel, the connection pipe adapted for carrying coolant fluid to or from the channel.

The body includes a receiving bore extending in a bore direction from the rear opening into the coolant channel, the channel being spaced in the bore direction from the rear face by a cover thickness of a cover portion and extends in the bore direction over a width. A connection pipe end portion extends into the receiving bore beyond the cover thickness and is form-fittingly received in the receiving bore along at least a portion of a width of the channel.

A metallurgical furnace cooling plate includes a cooling plate body with front and rear faces and at least one coolant channel inside the body, which communicates with a rear opening on the rear face; and a connection pipe connected to the body so that a pipe channel of the connection pipe communicates with the coolant channel, the connection pipe adapted for carrying coolant fluid to or from the channel.

The body includes a receiving bore extending in a bore direction from the rear opening into the coolant channel, the channel being spaced in the bore direction from the rear face by a cover thickness of a cover portion and extends in the bore direction over a width. A connection pipe end portion extends into the receiving bore beyond the cover thickness and is form-fittingly received in the receiving bore along at least a portion of a width of the channel.