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Electroslag remelting high-Ti low-Al alloy component control method

A technology for electroslag remelting and al alloy, which is applied in electroslag remelting process and metal material metallurgy field, and can solve the problem that high Ti and low Al alloy cannot be applied to electroslag remelting.

Inactive Publication Date: 2010-06-16
沈阳科金特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention is suitable for electroslag remelted steam turbine rotor steel, steel for nuclear power, steel for high temperature and high pressure vessels and other electroslag metals with low aluminum requirements, the slag system selected cannot be used for high Ti and low Al alloys (GH2136, Re26 , No8825 alloy) in electroslag remelting

Method used

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  • Electroslag remelting high-Ti low-Al alloy component control method
  • Electroslag remelting high-Ti low-Al alloy component control method
  • Electroslag remelting high-Ti low-Al alloy component control method

Examples

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Effect test

Embodiment 1

[0022] Electroslag remelting GH2136 alloy, the electroslag ingot size is Φ700m / m and the ingot weight is 6 tons.

[0023] Electrical parameters: furnace mouth voltage is 80V, current is 13KA, insulating base, and the ratio of selected slag system is: 30%CaF 2 , 30% CaO, 36% Al 2 O 3 , 4%TiO 2 The slag is baked at 600-800℃, 0.2% Al powder is added intermittently every 5 minutes, protected by purified Ar gas, and the electrode contains 3.0% Ti.

[0024] The distribution of [Ti] after remelting is:

[0025]

Embodiment 2

[0027] Electroslag remelting Re26 alloy, the electroslag ingot size is Φ490m / m, and the ingot weight is 3 tons.

[0028] Electrical parameters: furnace mouth voltage is 70V, current is 12.5KA, insulating base, and the ratio of selected slag system is: 28%CaF 2 , 32% CaO, 35% Al 2 O 3 , 5%TiO 2 After baking at 600-800℃, 0.2% Al powder is added intermittently every 5 minutes in the melting process, protected by purified Ar gas, and the electrode contains 2.9% Ti.

[0029] The distribution of [Ti] after remelting is:

[0030]

Embodiment 3

[0032] Electroslag remelting N08825 alloy, the electroslag ingot size is Φ490m / m, and the ingot weight is 3 tons.

[0033] Electrical parameters: furnace mouth voltage is 70V, current is 12.5KA, insulating base, and the ratio of selected slag system is: 32%CaF 2 , 25% CaO, 38% Al 2 O 3 , 5%TiO 2 After baking at 600~800℃, 0.2% Al powder is added intermittently every 5 minutes in the melting process, protected by purified Ar gas, and the electrode contains 1.1% Ti.

[0034] The distribution of [Ti] after remelting is:

[0035]

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Abstract

The invention relates to an electroslag remelting high-Ti low-Al alloy component control method which is characterized by comprising the following steps of: adopting electrical parameters; selecting a slag system, wherein the slag system contains the following components: 25-35 percent of caFa, 25-35 percent of CaO, 34-38 percent of Al2O3 and 3-5 percent of TiO2; adopting the protection of Ar gas purified by a molecular sieve in the remelting process; and discontinuously adding deoxidier Al powder in the remelting process so as to protect the slag system. The invention enables the Ti burning loss in high-Ti low-Al alloy to be lowest by adopting a process combining four parts and controlling the source of oxygen in the electroslag remelting process, thereby obtaining the stable alloy component and also reducing the cost.

Description

Technical field [0001] The invention relates to an electroslag remelting process, in particular to a method for controlling the composition of an electroslag remelting high Ti and low Al alloy, and belongs to metal material metallurgy technology. Background technique [0002] High-quality alloy materials The overall quality of metal electroslag remelting of alloy materials is relatively high, but it is difficult to control the active elements in steel. Due to the poor control of remelting in the gas phase and slag system, these easily oxidized elements are easy to burn Damage, and the difference between the top and bottom of the ingot is great. Therefore, how to accurately control the burning loss of these easily oxidizable elements and minimize the burning loss, so that the alloy can obtain stable performance and reduce the cost, is a topic that needs to be solved urgently. The Chinese invention patent with publication number CN1059371 provides an "Electroslag Remelting Technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
Inventor 那帅李爱民文长春刘智勇罗迎屠宇岳景东李晓军
Owner 沈阳科金特种材料有限公司