Method for preparing hollow steel ingot for protection ring of large power generator by adopting electroslag remelting

Abstract

The invention discloses a method for preparing a hollow steel ingot for a protection ring of a large power generator by adopting electroslag remelting. The method comprises the following steps: (1) preparing consumable electrode groups; (2) melting slag into liquid molten slag; (3) inserting the consumable electrode groups into an electroslag remelting hollow ingot crystallizer; (4) starting two transformers; (5) injecting the liquid molten slag into the electroslag remelting hollow ingot crystallizer; (6) when the consumable electrode groups are in contact with the liquid molten slag, forming an electrifying loop among fake electrodes, the consumable electrode groups and a bottom water tank; (7) when the liquid molten slag is in contact with an upper section, forming a loop among the upper section, the bottom water tank and the transformers connected with the bottom water tank; (8) adjusting the output currents and voltages of the two transformers; (9) when a metal melt is in contact with a molten steel liquid level detection device, starting an ingot stripping device for ingot stripping; (10) exchanging the consumable electrode groups; and (11) inserting subsequent consumable electrode groups into the liquid molten slag, and repeating the steps (8 to 10) until the ingot stripping is finished.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for electroslag remelting to prepare a hollow steel ingot for a large generator retaining ring. Background technique [0002] The composition of my country's primary energy determines that coal-fired power plants occupy a dominant position. This is also the biggest challenge my country faces in controlling greenhouse gas emissions. Therefore, using less coal to generate more power and clean and efficient utilization of coal have become strategic issues related to the sustainable development of my country's national economy. , one of the most important ways is to develop large-capacity and high-parameter supercritical and ultra-supercritical generator sets to improve the thermal efficiency of the generator set; The ring-shaped forgings of the winding coils at both ends of the motor rotor are used to protect the coils at both ends of the drive motor rotor from...

AI Technical Summary

Problems solved by technology

[0004] Using the traditional method to prepare hollow steel ingots for retaining rings has complex procedures, low forging yield, and a large amount of material waste caused by the punching process; multiple heating and multiple process deformations are easy to change the internal structure of the steel ingot, and are prone to forging cracks. It is also difficult to remove, and reheating after repeated cooling seriously affects the quality of the product. It is difficult to process hollow steel ingots for super large retaining rings, and the accuracy of the product and the uniformity of the material cannot be guaranteed.

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