Remelting process of Ni-Cr-Mo anti-corrosion alloy stripping electroslag containing Ti

Abstract

The invention belongs to the technical field of smelting of special alloy. The disclosed remelting process of Ni-Cr-Mo anti-corrosion alloy stripping electroslag containing Ti mainly comprises the steps of: preparation of a consumable electrode, a slag system, arcing and slagging, purification of slag charge, ignition stage, and electroslag remelting and feeding, wherein the content of Ti in the consumable electrode is controlled at 1.1-1.4%; and the slag system adopts a five-element slag system, and the ratio of the components namely CaF2 to Al2O3 to CaO to TiO2 to SiO2 is (50-55%): (15-20%): (15-20%):o (7-9%): (2-3%). The Ni-Cr-Mo anti-corrosion alloy containing Ti with a small section can be produced by the remelting process; burning loss of the Ti element which is easy to oxidize is effectively controlled; and the situation that a slag shell has certain strength and toughness also can be guaranteed, so that the slag shell does not crack in a stripping process, and missed melting of a metal melting pool is avoided.

Description

technical field [0001] The invention belongs to the technical field of special alloy smelting, and relates to an electroslag remelting process, in particular to a Ti-containing Ni-Cr-Mo corrosion-resistant alloy ingot drawing electroslag remelting process. Background technique [0002] China Patent No. 201010201980, titled "A Process Method for Electroslag Remelting of Ti-Containing Steel", introduces the control method of Ti element in the process of electroslag remelting of 825 alloy, and the slag system used. The ingot electroslag remelting process of Ti-containing Ni-Cr-Mo corrosion-resistant alloy is not involved. [0003] Chinese Patent No. CN 101736164 A, titled "A method for controlling the composition of high-Ti and low-Al alloys in electroslag remelting", controls the source of oxygen in the process of electroslag remelting, and uses Ar gas protection to make Ti burn out amount to a minimum. The ingot electroslag remelting process of Ti-containing Ni-Cr-Mo corros...

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Problems solved by technology

[0009] In order to overcome the shortcomings of the fixed electroslag remelting process in the background technology that cannot produce small-section Ti-containing Ni-Cr-Mo corrosion-resistant alloys, as well as the shortcomings of low melting speed, production efficiency and yield, the present invention changes the electroslag remelting process of ingot drawing The technology has not been applied to the status quo of Ti-containing Ni-Cr-Mo corrosion-resistant alloys. A Ti-containing Ni-Cr-Mo corrosion-resistant alloy ingot electroslag remelting process is proposed, so that the process can effectively control easily oxidized elements The burning loss of Ti can also ensure that the slag shell has a certain strength and toughness, so that the slag shell does not break during the ingot drawing process, and the molten metal pool does not leak, so as to obtain Ti-containing Ni with qualified composition, excellent surface quality and internal structure. -Cr-Mo corrosion-resistant alloy electroslag ingot, which has the characteristics of high production efficiency, high yield, excellent surface quality and microstructure performance

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