Ti and Al control method for nickel-based air valve alloy steel electroslag remelting

Abstract

The invention discloses a Ti and Al control method for nickel-based gas valve alloy steel electroslag remelting. An electroslag remelting slag system comprises the following components in percentage by mass: 50%-55% of CaF, 18%-25% of Al2O3, 15%-25% of CaO, 2%-5% of MgO and 2%-5% of TiO2. Aluminum powder accounting for 0.2%-0.5% of the mass of the slag is added before electroslag remelting. According to the method, the burning loss of Ti and Al in the electroslag remelting process can be effectively reduced, the uniformity of the content uniformity of Ti and Al in all parts of the remelted ingot is improved, and the deviation of the head and the tail is reduced. According to the electroslag ingot obtained through the method, the Ti element is controlled to be +/-0.03, the Al element is controlled to be +/-0.03, the head and tail components of the electroslag ingot are uniform, the burning loss amount of Ti and Al is guaranteed, and the smelting quality and the product yield of electroslag are effectively guaranteed.

Description

Technical field [0001] The present invention relates to a Ti, Al control method of a nickel-based gas valve alloy steel electric slag, and a nickel-based gas valve alloy steel. Background technique [0002] The electroslag remelting is a process for retrosing steel for a general smelting method; its working principle is that the current passes through the slag cell produces a high temperature heating self-consuming electrode, and the top end of the self-consuming electrode is gradually melted to form a metal melt droplets. The torch tank is cooled in a metal-cooled crystallizer to form a ingot in the metal molten tank; the main purpose is to purify the metal and obtain a uniform dense steel ingot of clean tissue. [0003] When using a vacuum-electric residue double process, it was found that Ti, Al in the vacuum smelting link alloy housing rate can be accurately controlled, but it is difficult to control in the electroslag remembering process Ti, Al content Ti, Al content It is e...

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Problems solved by technology

[0003] When the vacuum-electroslag dual process is used to smelt Ti-containing nickel-based valve alloy steel, it is found that the alloy yield of Ti and Al can be accurately controlled in the vacuum smelting process, but it is difficult to control the content of Ti and Al in the electroslag remelting process , prone to serious burning loss of Ti and Al, resulting in the content of Ti and Al in the remelted ingot being lower than the lower limit of the standard; thus problems such as uneven Ti and Al content in various parts, large head-to-tail deviation, etc.

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