Device and method for preparing composite roller/composite steel ingot through electroslag smelting casting method

Abstract

The invention discloses a device and method for preparing a composite roller / composite steel ingot through an electroslag smelting casting method. The device comprises an L-shaped crystallizer, an electrode system and a power system. The first pole of a power source is connected with a cross arm through a short net, the second pole of the power source is connected with an electric conduction graphite plate through a short net, and a second loop switch is arranged on the short net connecting the second pole with the electric conduction graphite plate. The first pole of the power source is further connected with the electric conduction graphite plate through a short net with a third loop switch, and the second pole of the power source is connected with a core rod shaft through a short net with a first loop switch. The method comprises the steps that a consumable electrode is fixed to the cross arm; a core rod is fixed to a bearing pedestal; the first loop switch is turned on so that thetemperature of a slag bath can be increased, and the core rod is preheated; preheating is completed; and a first loop and a third loop are turned off, the second loop switch is turned on, and the consumable electrode is molten and starts recombination. By means of the method, uniformity of a fuse layer, at the axial height, of a whole combination product can be guaranteed; and the melting degree of a bonding interface is precisely controlled.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a device and method for preparing composite rolls / composite steel ingots by electroslag casting. Background technique [0002] In recent years, the development of large-scale and complex equipment in the fields of electric power, petrochemical, and metallurgy has put forward higher requirements for the large-scale casting and forging industry, and there is an increasing demand for large-scale steel ingots. [0003] Among the million-kilowatt nuclear power units, whether it is the second-generation plus or the third-generation AP1000 and CAP1400, there are a large number of castings and forgings with high technical requirements, large specifications, and complex shapes. Forgings with complex shapes such as cylinders require integral forging; the low-voltage integral rotor of the conventional island of a million-kilowatt nuclear power unit is currently the solid forg...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the shortcomings of the power supply circuit scheme in the process of preparing composite steel ingots by traditional electroslag casting and the natural shortcomings of vertical production methods, resulting in uneven axial material properties, the present invention provides a method for preparing composite rolls / rollers by electroslag casting. The device and method for the composite steel ingot change the position of the high temperature zone of the slag pool by adjusting the current flow path in the composite steel ingot smelting system and the distance between the self-consumable electrode and the surface of the mandrel at different smelting periods, thereby avoiding the overheating of the mandrel surface. Melting, improving the uniformity of the axial performance of the bonding interface, controlling the uniformity of the circumferential performance, and improving the composite quality

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