Method for co-producing TC4 titanium alloy round ingots/flat ingots through VAR furnace and 7-gun cold cathode EB furnace

Abstract

The invention discloses a method for co-producing TC4 titanium alloy round ingots / flat ingots through a VAR furnace and a 7-gun cold cathode EB furnace. The method comprises the following steps of: averaging within a component range stipulated by the national standards as a datum value; increasing a datum value of an element Al and reducing a datum value of an element V, and then, taking the elements Al and V as proportioning components of brinqueting batch; covering alloy package in proportion, pressing sponge titanium and alloy package into an electrode block, and adopting a plasma welding machine to weld the electrode block into a long electrode; and smelting the long electrode into primary cast ingot through the VAR furnace, and performing secondary smelting on the primary ingot smelted by the VAR furnace through the 7-gun cold cathode EB furnace, thereby obtaining very-large-scale high-quality TC4 titanium alloy round ingots / flat ingots. The method is convenient to operate, can realize control on elements aluminum and vanadium, can greatly improve stability of the elements aluminum and vanadium in cast ingots of the TC4 titanium alloy, and further improves quality of the conventional TC4 titanium alloy product, so that the product obtains good market competition ability.

Description

technical field [0001] The invention relates to a method for jointly producing low-cost, large-size, high-quality TC4 titanium alloy round ingots / flat ingots with a VAR furnace + 7-gun cold cathode EB furnace, and belongs to the field of engineering technology. Background technique [0002] After more than ten years of rapid development of my country's titanium industry, the production capacity is seriously overcapacitated, the market for low-end titanium products exceeds demand, and the production capacity of high-end products is insufficient. Quality TC4 titanium alloy is still mainly dependent on imports. In response to this situation and the fierce competition in the market, China's titanium industry must find new development directions, focus on the development of high-end products, and form its own core competitiveness. [0003] The traditional vacuum consumable electric arc furnace (hereinafter referred to as VAR furnace) produces TC4 titanium alloy. The process is si...

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Problems solved by technology

[0003] The traditional vacuum consumable electric arc furnace (hereinafter referred to as VAR furnace) produces TC4 titanium alloy. The process is simple, but it needs multiple melting and casting, the yield is low, the production cost is high, and there are high-density inclusions (HDI) and low-density inclusions (LDI). ) are difficult to remove, leaving serious safety hazards for the use of subsequent materials

Electron beam cold bed melting furnace (EBCHM, hereinafter referred to as EB furnace) has the function of refining and purification, which can effectively remove HDI and LDI contained in titanium alloy and obtain cleaner products, but the process is complex and the technical difficulty of stably controlling the composition is great

In particular, the power of the hot cathode electron gun is high and the vacuum degree is high, which can easily cause burning or volatilization of alloy elements with low saturated vapor pressure.

[0004] Through the search of existing technical literature, no relevant reports have been found on the combined casting production process of VAR furnace + 7-gun cold cathode EB furnace

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