Abstract: The present disclosure provides a method for producing a high nitrogen steel by a duplex melting process of a pressurized ladle refining and a pressurized electroslag remelting, which relates to the technical field of high nitrogen steel melting. In the present disclosure, the molten steel is subjected in sequence to a nitrogen alloying, a deep deoxidation and a deep desulfurization by adding a nickel-magnesium alloy and rare earth in the pressurized ladle furnace, and a combination of a blowing nitrogen from the bottom of the pressurized ladle and a pressurized nitriding at the interface of gas and the molten steel is used to achieve a high-efficiency nitrogen alloying, a uniform nitrogen distribution, and a decreased impurity content in the ingot; then the ingot is subjected to a pressurized electroslag remelting to obtain a high nitrogen steel.

Abstract: The present disclosure provides a method for producing a high nitrogen steel by a duplex melting process of a pressurized ladle refining and a pressurized electroslag remelting, which relates to the technical field of high nitrogen steel melting. In the present disclosure, the molten steel is subjected in sequence to a nitrogen alloying, a deep deoxidation and a deep desulfurization by adding a nickel-magnesium alloy and rare earth in the pressurized ladle furnace, and a combination of a blowing nitrogen from the bottom of the pressurized ladle and a pressurized nitriding at the interface of gas and the molten steel is used to achieve a high-efficiency nitrogen alloying, a uniform nitrogen distribution, and a decreased impurity content in the ingot; then the ingot is subjected to a pressurized electroslag remelting to obtain a high nitrogen steel.

Abstract: A method for manufacturing hollow ingot for retaining ring of large generator by electroslag remelting, comprising the following steps: (1) preparing consumable electrode assemblies; (2) melting slag into molten slag; (3) inserting one consumable electrode assembly into an electroslag remelting hollow ingot mold; (4) switching on two transformers; (5) pouring the molten slag into the electroslag remelting hollow ingot mold; (6) forming a current circuit among a stub, the consumable electrode assembly and a water-cooled bottom plate; (7) forming a current circuit among the upper segment, the water-cooled bottom plate and the transformer; (8) regulating the output current and voltage of the two transformers; (9) starting a withdrawing device to withdraw; (10) exchanging the consumable electrode assembly; (11) inserting a subsequent consumable electrode assembly into the molten slag, and repeating steps (8) to (10) until withdrawing is completed.

Abstract: A method for manufacturing hollow ingot for retaining ring of large generator by electroslag remelting, comprising the following steps: (1) preparing consumable electrode assemblies; (2) melting slag into molten slag; (3) inserting one consumable electrode assembly into an electroslag remelting hollow ingot mold; (4) switching on two transformers; (5) pouring the molten slag into the electroslag remelting hollow ingot mold; (6) forming a current circuit among a stub, the consumable electrode assembly and a water-cooled bottom plate; (7) forming a current circuit among the upper segment, the water-cooled bottom plate and the transformer; (8) regulating the output current and voltage of the two transformers; (9) starting a withdrawing device to withdraw; (10) exchanging the consumable electrode assembly; (11) inserting a subsequent consumable electrode assembly into the molten slag, and repeating steps (8) to (10) until withdrawing is completed.