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Ti element control method for Ti-contained corrosion resistant alloy ingot extracting electroslag remelting slab

A corrosion-resistant alloy and electroslag remelting technology, which is applied in the field of special alloy refining, can solve problems such as poor fluidity, achieve the effects of reducing production costs, reducing energy consumption, and saving forging blanking processes

Active Publication Date: 2014-12-17
LUOYANG SUNRUI SPECIAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO in this slag system 2 The content of 7%~9% can reduce the burning loss of Ti. However, the viscosity of the slag system is 0.12~0.13Pa·s at 1600°C, and the fluidity is poor. Under the action of the electromagnetic field, the liquid flows from the mold wall to the core of the mold, and the slag with too high viscosity value will be involved in the molten steel to form slag inclusions

Method used

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  • Ti element control method for Ti-contained corrosion resistant alloy ingot extracting electroslag remelting slab
  • Ti element control method for Ti-contained corrosion resistant alloy ingot extracting electroslag remelting slab
  • Ti element control method for Ti-contained corrosion resistant alloy ingot extracting electroslag remelting slab

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Adopting the "Ti element control method for electroslag remelting slabs of Ti-containing iron-nickel-based corrosion-resistant alloys" of the present invention to produce UNS N08825 ingot-drawing electroslag remelting slabs with specifications of 200mm×1250mm×4000mm and weighing about 8000Kg, Include the following steps.

[0065] In the first step, the consumable electrode is smelted by the "medium frequency induction furnace + AOD" process. The electrode size is 270mm×1370mm×2800mm. The chemical composition of the electrode is shown in Table 1.

[0066] Table 1 UNS N08825 electrode chemical composition (weight %)

[0067]

[0068] The second step is to polish the surface of the consumable electrode and weld it on the dummy electrode.

[0069] The third step is to calculate the TiO required in the slag discharge system when the Ti burning loss reaction reaches equilibrium through the chemical reaction equilibrium formula and thermodynamic principles. 2 content, the...

Embodiment 2

[0125] Adopting the "Ti element control method for electroslag remelting slabs of Ti-containing iron-nickel-based corrosion-resistant alloys" of the present invention to produce UNS N08825 ingot-drawing electroslag remelting slabs with specifications of 200mm×1250mm×4000mm and weighing about 8000Kg, Include the following steps.

[0126] The first step is to use the "medium frequency induction furnace + AOD" process to smelt the consumable electrode. The electrode size is 270mm×1370mm×2800mm, and the chemical composition of the electrode is shown in Table 3;

[0127] Table 3 UNS N08825 electrode chemical composition (weight %)

[0128]

[0129] The second step is to polish the surface of the consumable electrode and weld it on the dummy electrode;

[0130] The 3rd step, repeat the 3rd step in the embodiment 1, obtain the activity of Al a [Al]=1.67, the activity of Ti a [Ti]=21.29, TiO 2 Theoretical concentration 0.036, Al 2 o 3 Theoretical concentration 0.42;

[0131]...

Embodiment 3

[0142] The "Ti element control method for electroslag remelting slabs of Ti-containing iron-nickel-based corrosion-resistant alloys" of the present invention is used to produce UNS N08825 ingot-drawing electroslag remelting slabs with a size of 200mm×1250mm×4000mm and a weight of about 8000Kg.

[0143] The first step is to use the "medium frequency induction furnace + AOD" process to smelt the consumable electrode. The electrode specification is 270mm×1370mm×2800mm, and the chemical composition of the electrode is shown in Table 5;

[0144] Table 5 UNS N08825 electrode chemical composition (weight %)

[0145]

[0146] The second step is to polish the surface of the consumable electrode and weld it on the dummy electrode;

[0147] The 3rd step, repeat the 3rd step of embodiment 1, obtain the activity of Al a [Al]=1.46, the activity of Ti a [Ti]=21.59, TiO 2 Theoretical concentration 0.037, Al 2 o 3 The theoretical concentration is 0.356;

[0148] In the fourth step, ac...

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Abstract

The invention relates to a Ti element control method for a Ti-contained corrosion resistant alloy ingot extracting electroslag remelting slab. The control method comprises the following steps: a proper slag system is designed; according to each of melt electrodes with different chemical components, the TiO2 content of the slag system when the Ti element burning loss is balanced is obtained through a thermodynamic calculation method; the matched slag system is selected to control the Ti element burning loss; when the electroslag remelting begins, 3% of SiO2 is added; after the electroslag remelting is performed for 2-3 hours, 1-3% of remainder SiO2 is added in a slag pool; in the electroslag remelting process, Al particles are added for deoxidizing molten slag; and the content sum of the Al particles and Al in the electrode is controlled at 0.2% which is the upper limit of Al content in a UNSN08825 alloy. The Ti element control method solves the problem of synchronous control of surface quality, internal quality and Ti element content of the electroslag remelting slab in the ingot extracting electroslag remelting process of a Ti-contained iron nickel-based corrosion resistant alloy UNSN08825 slab in the atmospheric environment.

Description

technical field [0001] The invention belongs to the technical field of special alloy refining. In particular, it relates to a method for controlling the burning loss of Ti element in the electroslag remelting process of Ti-containing iron-nickel-based corrosion-resistant alloy slab ingot drawing in an atmospheric environment. Background technique [0002] At present, the electroslag remelting process of Ti-containing stainless steel mainly includes two methods: fixed type and ingot type electroslag remelting. The fixed electroslag remelting process is that the entire smelting process is carried out in a closed crystallizer, and the ingots are solidified sequentially from bottom to top, and there is no problem of steel leakage or slag leakage. The method of controlling the burning loss of Ti element in the electroslag remelting process Yes: the slag system uses CaF 2 、Al 2 o 3 、TiO 2 Ternary slag system or CaF 2 , CaO, Al 2 o 3 、TiO 2 Quaternary slag system, TiO in s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22C30/00C22C1/02
Inventor 陈帅超王新鹏宁天信罗利阳张春林
Owner LUOYANG SUNRUI SPECIAL EQUIP
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