SU439184A1 - Method of electroslag remelting - Google Patents

Description

one

The invention is intended for use in special electrometallurgy in the production of steel and alloys by the method of electroslag remelting (ESR) in furnaces with the intermixing of an ingot and a crystallizer.

Known methods of ESR consumable electrode with the imposition of a reversible alternating magnetic field (RMP) on the slag and metal melts with the help of a solenoid placed on the mold.

The known methods of applying an RMP to the melt are based on the interaction of the longitudinal alternating magnetic field of the solenoid with the magnetic field of the radial component of the current of the electrode in the slag bath. In this case, a volume ponderomotive force of one direction arises, which can be expressed in general form:

F B-J-eosV,, where B is the solenoid induction;

J is the radial component of the current; - shear angle between Wee J.

From the above expression it follows that the force E depends on the induction of the solenoid B, the current J and on the phase difference between B and J.

Forcibly change the angle of shift between B and J to 100 el. hail., change the direction of the force F and reverse the movement of the melt at different frequencies, which leads to the refinement of the structure of the ingot and an increase in the quality of the metal.

However, the known methods of ESR with imposing RMP on the melt have significant drawbacks.

When the ESR furnace changes its current mode (current programming, change in the interelectrode gap due to slag consumption for the formation of crust, crystallizer taper, etc.), the radial component of the electrode current in the slag bath changes, which, according to the above equation, changes the volume ponderomotive force at constant solenoid induction.

As a result, the intensity of the impact of the PMF on the melt is different in height of the ingot and the metal structure is heterogeneous, which significantly reduces the efficiency of the ESR process with the introduction of the PMF.

In order to stabilize the mechanical effect on the crystallization front of the ingot

A method has been proposed in which the radial component of the current in the slag bath is continuously measured in the ESR process of the consumable electrode in the movable mold and the solenoid current is corrected so that the product of the induction of the solenoid and the radial component of the current of the slag bath remains constant throughout melting

The radial component of the electrode current in the slag bath can be measured, for example, using a current transformer included in a jumper connecting the movable crystallizer to the furnace tray.

Thus, the proposed ESR method with RMP overlay on the melt allows stabilizing the volumetric ponderomotive force arising in the melt, regardless of the change in the radial component of the electrode current for any of the above reasons, contributes

obtaining the same physicochemical properties of the cast metal along the entire length of the ingot, increasing the efficiency of the ESR process.

Claims (1)

Invention Formula The method of electroslag remelting of consumable electrodes in a cooled movable crystallizer overlaying slag and metal melts with a reversing alternating magnetic field induced by a solenoid, characterized in that, in order to stabilize the mechanical effect on the crystallization front of the ingot, the radial component of the current in the slag bath is continuously measured and maintain a constant value of the product of induction of the solenoid by the radial component of the current in the slag bath; ii radial component of current in schlakovoy bath.