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A kind of method of electroslag remelting Hastelloy alloy

A technology of electroslag remelting and Hastelloy, applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of sacrificial metal yield, poor surface quality, forging cracking, etc., to reduce the width of the two-phase zone, good The effect of surface quality and composition uniformity

Active Publication Date: 2021-03-09
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, the solution to the internal segregation and structural problems of electroslag ingots is mostly to reduce the melting rate and shorten the local solidification time of the ingot as much as possible, but too much reduction in the melting rate will also lead to poor surface quality and increase the possibility of forging cracks
Therefore, some manufacturers adopt the method of ingot stripping and forging to avoid such problems, but this sacrifices the metal yield and increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The method of this electric slag remelled Hakette alloy was used.

[0023] (1) Preparation of electrode: According to the target ingredient, use 500 kg of vacuum induction furnace smelting, overheating 80 ° C with electric steel, cast into φ200 * 1800mm self-consuming electrode, main components: Ni 56%, Cr 17%, mo 16.5% Fe 5%, W 4.3%, MN0.1%, Si 0.05%, C 0.01%, P 0.014%, S 0.008%. The self-consuming electrode electrode is fixed at a high temperature diffusion at 1100 ° C for 3 h, and then welded to the auxiliary electrode.

[0024] (2) Locating φ250 * 30mm ingot on the bottom water tank, then place diameter * high * thickness is φ230mm * 60mm * 0.1mm in the ingot plate, and placed 95% Hakle alloy in the circle. The arc ratta + 5% is fully baked, and then place φ300 * 1300 mm crystallizer and protective cover, install the self-consuming electrode, and turn on the argon pipe. The arc rat was baked before 380 ° C for 8 h.

[0025] (3) Bake the predelled residue at 6...

Embodiment 2

[0032] Example 2: The method of this electric residue remelled Hak's alloy was used.

[0033] (1) Preparation of electrode: According to the target ingredient, use 500 kg of vacuum induction furnace smelting, overheating 100 ° C with electric steel, cast into φ220 * 1500mm self-consuming electrode, main components: Ni 57%, Cr 17%, mo 16.5% FE 4.5%, W 4%, MN0.3%, Si 0.02%, C 0.01%, P 0.015%, S 0.010%. The self-consuming electrode is annealed at a high temperature diffusion at 1150 ° C for 3.2 h, and then welded to the auxiliary electrode.

[0034] (2) Locating φ270 * 30mm ingot on the underwater tank, then place diameter * high * thickness to φ250mm * 60mm * 0.1mm in the ingot plate, placed in the absence of the material, 95% Haky The arc ratta + 5% is fully baked, and then place φ300 * 1300 mm crystallizer and protective cover, install the self-consuming electrode, and turn on the argon pipe. The arc rat was baked for 10 h then at 350 ° C.

[0035] (3) Bake the predelled slag for ...

Embodiment 3

[0042] Example 3: The method of this electric slag remelled Haboo alloy was used.

[0043] (1) Preparation of electrode: According to the target ingredient, use 500 kg of vacuum induction furnace smelting, overheating 60 ° C with electric steel, cast into φ200 * 1800mm self-consuming electrode, main components: Ni 56.2%, Cr 16%, mo 16.3% FE 4.8%, W4.5%, Mn 0.2%, Si 0.04%, C 0.008%, P 0.011%, S 0.007%. The self-consuming electrode electrode is 10.5 h at a high temperature diffusion at 1130 ° C, and then welded to the auxiliary electrode.

[0044] (2) Locating φ260 * 30mm ingot on the underwater tank, then place diameter * high * thickness is φ240mm * 60mm * 0.1mm in the ingot plate, and placed 90% of Hakya alloy in the circle. The arc rats + 10% are fully baked, and then place φ300 * 1300 mm crystallizer and protective cover, install the self-consuming electrode, and turn on the argon pipe. The arc rat was baked at 400 ° C for 6 h prior to use.

[0045] (3) Bake the pre-eucked resi...

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Abstract

The invention discloses a method for electroslag remelting Hastelloy alloy. The consumable electrode used in the method is subjected to high-temperature diffusion annealing at 1100°C to 1150°C and then electroslag remelting is carried out under the protection of argon; the remelting period during electroslag is The melting rate is 3kg / min~3.5kg / min. The consumable electrode used in this method is first subjected to high-temperature diffusion annealing, and then electroslag remelting is performed after homogenization is completed, and a lower melting rate is used to control, which can effectively ensure that the solidified structure of the ingot is uniform, so as to obtain the composition structure Uniform, excellent Hastelloy steel ingot. This method ensures the matching of the electroslag system, the liquidus temperature of the Hastelloy alloy is low, and a shallow and flat molten pool can be obtained by using a higher voltage and a lower current during the smelting period, thereby ensuring a good melting rate at a low melting rate. Surface quality; improve the electroslag process by appropriately increasing the filling ratio, increase the direct current component of the mold in the electroslag process, maintain a lower slag temperature and less molten pool volume, thereby reducing the width of the two-phase zone and shortening the local solidification time. Obtain better coagulation tissue.

Description

Technical field [0001] The present invention relates to a method of removing a removal method, particularly a method of removing the Hakette alloy of an electric residue. Background technique [0002] The Harbird alloy is a performance-resistant corrosion-resistant alloy, which has excellent performance in moiston, various oxidative chloride, chloride solution, sulfuric acid and oxidative salt, and is also good in low temperatures and medium temperature hydrochloric acid. Corrosion resistance. Therefore, since the 1980s, there has been a wide range of applications in the very demanding corrosive environments of petrochemical, flue gas desulfurization, pulp and papermaking, environmental protection. [0003] At present, the smelting process of Hah alloy has been introduced, and only related processes such as subsequent heat treatment are introduced, mainly because the smelting difficulty of Hardware alloy is large. It is generally believed that the Haust alloy uses a vacuum induct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/18C22C19/05C21D9/00C22F1/10
CPCC21D9/0068C22B9/18C22C19/056C22F1/10
Inventor 张福利牟瑞宇张晓峰孙中华李博斌梁爱国刘海峰孙少海
Owner HEBEI IRON AND STEEL
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