Remelting refining slag and method for applying remelting refining slag to electroslag remelting of high-Al and high-Ti alloy steel

An electroslag remelting and electroslag remelting furnace technology, applied in the field of electrometallurgy, can solve the problems of large deviation of the head and tail of Ti steel ingots, unsuitable electroslag remelting, uneven collection, etc. The effect of TiO2 transferring oxygen supply and improving activity coefficient

Active Publication Date: 2016-09-21
宝武特冶航研科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent with the publication number CN101736164 aims to solve the problem of electroslag remelting to produce metal materials with high Ti and low Al (Ti: 2.4~3.2%, Al≤0.35%), and the slag selected above in the prior art is used For alloys with equivalent Al and Ti content, especially alloys with high Al and high Ti content and equivalent Al and Ti content, Al and Ti are not uniformly harvested, especially Ti steel ingots have a large deviation at the head and tail, so the existing slag system is not applicable Electroslag remelting of such alloys
For example, in the electroslag remelting of GH37, GH35, and GH500, there are certain limitations and deficiencies.

Method used

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  • Remelting refining slag and method for applying remelting refining slag to electroslag remelting of high-Al and high-Ti alloy steel
  • Remelting refining slag and method for applying remelting refining slag to electroslag remelting of high-Al and high-Ti alloy steel
  • Remelting refining slag and method for applying remelting refining slag to electroslag remelting of high-Al and high-Ti alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Electroslag remelting GH37 alloy

[0028] The GH37 alloy is used as the consumable electrode, the size of the consumable electrode blank is ∮450mm, and the mold size is ∮600mm.

[0029] Select remelting and refining slag of the following components by weight: CaF 2 50 parts, Al 2o 3 20 parts, CaO 15 parts, TiO 2 10 parts and MgO 5 parts. Among them, CaF 2 、Al 2 o 3 , CaO, TiO 2 and SiO in MgO 2 The mass content of all ≤ 1.0%.

[0030] The following method is used to carry out electroslag remelting of GH37 alloy, including the following steps:

[0031] 1) Bake the above remelted refining slag at 800°C for 10 hours,

[0032] 2) Use the above GH37 alloy as the consumable electrode, assemble the electroslag remelting furnace, add the deoxidizer and the remelting refining slag baked in step 1) to the special slag melting furnace for melting, and the slag is completely melted Pour it into the remelting furnace; wherein, the added amount of the remelti...

Embodiment 2

[0037] Embodiment 2 Electroslag remelting of GH35 alloy

[0038] The GH35 alloy is used as the consumable electrode, the size of the consumable electrode blank is ∮490mm, and the mold size is ∮650mm.

[0039] Select remelting and refining slag of the following components by weight: CaF 2 45 parts, Al 2 o 3 20 parts, CaO 20 parts, TiO 2 8 parts and MgO 7 parts. Among them, CaF 2 、Al 2 o 3 , CaO, TiO 2 and SiO in MgO 2 The mass content of all ≤ 1.0%.

[0040] The following method is used to carry out electroslag remelting of GH35 alloy, including the following steps:

[0041] 1) Bake the above remelted refining slag at 650°C for 13 hours,

[0042] 2) Use the above GH35 alloy as the consumable electrode, assemble the electroslag remelting furnace, add the deoxidizer and the remelting refining slag baked in step 1) to the special slag melting furnace for melting, and the slag is completely melted Pour it into the remelting furnace; wherein, the added amount of the r...

Embodiment 3

[0047] Example 3 Electroslag remelting of GH500 alloy

[0048] GH500 alloy is used as the consumable electrode, the size of the consumable electrode blank is ∮525mm, and the mold size is ∮700mm.

[0049] Select remelting and refining slag of the following components by weight: CaF 2 48 copies, Al 2 o 3 19 parts, CaO 18 parts, TiO 2 9 parts and MgO 6 parts. Among them, CaF 2 、Al 2 o 3 , CaO, TiO 2 and SiO in MgO 2 The mass content of all ≤ 1.0%.

[0050] The electroslag remelting of the GH500 alloy is carried out by the following method, including the following steps:

[0051] 1) Bake the above remelted refining slag at 700°C for 11 hours,

[0052] 2) With the above-mentioned GH500 alloy as the consumable electrode, assemble the electroslag remelting furnace. Add the deoxidizer and the remelted refining slag baked in step 1) into a special slag melting furnace for melting, and pour the molten slag into the remelting furnace after all the slag is melted; wherein, ...

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Abstract

The invention provides remelting refining slag and a method for applying the remelting refining slag to electroslag remelting of high-Al and high-Ti alloy steel. The remelting refining slag comprises components in parts by weight as follows: 45-50 parts of CaF2, 15-20 parts of Al2O3, 15-20 parts of CaO, 8-10 parts of TiO2 and 5-7 parts of MgO. According to the method, firstly, the refining slag and a deoxidizing agent are roasted at 650-800 DEG C in a heat-insulated manner for 9-13 h, the high-Al and high-Ti alloy steel is used as a consumable electrode, the deoxidizing agent and the roasted remelting refining slag are added to a slag melting furnace to be melted, then the completely melted deoxidizing agent and remelting refining slag are poured into an electroslag remelting furnace, the electroslag remelting furnace is assembled, the voltage is adjusted to range from 60 V to 65 V, the current is adjusted to range from 9,500 A to 15,000 A, and remelting smelting is performed on the consumable electrode under protection of an inert gas. Al and Ti of steel ingots produced through the method are qualified in content and are evenly distributed.

Description

technical field [0001] The invention belongs to the technical field of electrometallurgy, and relates to a remelting refining slag and an electroslag remelting method for high Al and high Ti alloy steel. Background technique [0002] Electroslag remelting is a method in which the consumable electrode is melted by the resistance heat of slag, and metal droplets pass through the slag layer to form a molten pool, and are recrystallized and solidified into steel ingots in the crystallizer. In the process of melting and forming droplets-slag washing-solidification, a variety of complex metallurgical physical and chemical reactions occur in the consumable electrode. Different steel types will have different chemical compositions before and after remelting under different remelting process systems. The change. Especially when remelting steel types containing Al and Ti elements, Al and Ti are easily oxidized in the process of electroslag remelting, making it difficult to control th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
CPCC22B9/18
Inventor 秦洪伟
Owner 宝武特冶航研科技有限公司
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