Electroslag remelting method for Hastelloy

A technology of electroslag remelting and Hastelloy alloy, which is applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems of sacrificial metal yield, poor surface quality, forging cracking, etc., and achieve the reduction of the width of the two-phase zone, good The effect of surface quality and composition uniformity

Active Publication Date: 2019-10-15
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] Embodiment 1: The method for electroslag remelting Hastelloy adopts the following specific processes.

[0023] (1) Electrode preparation: According to the target composition, use a 500kg vacuum induction furnace to smelt, superheat 80°C to tap the steel, and cast it into a Φ200*1800mm consumable electrode. The main components are: Ni 56%, Cr 17%, Mo 16.5% , Fe 5%, W 4.3%, Mn 0.1%, Si 0.05%, C 0.01%, P 0.014%, S 0.008%. The consumable electrode is annealed by high temperature diffusion at 1100°C for 3 hours, and then welded to the auxiliary electrode.

[0024] (2) Lay a Φ250*30mm dummy plate in the middle of the bottom water tank, and then place a diameter*height*thickness of Φ230mm*60mm*0.1mm on the dummy plate with the same material as the starting arc ring, and place the volume in the ring accounting for 95% Hastelloy alloy Arc strike debris + 5% pre-melted slag that has been fully baked, then place the Φ300*1300mm crystallizer and protective cover in sequence, insta...

Embodiment 2

[0032] Embodiment 2: The method for electroslag remelting of Hastelloy adopts the following specific processes.

[0033] (1) Electrode preparation: According to the target composition, use a 500kg vacuum induction furnace to smelt, superheat 100°C to tap the steel, and cast it into a Φ220*1500mm consumable electrode. The main components are: Ni 57%, Cr 17%, Mo 16.5% , Fe 4.5%, W 4%, Mn 0.3%, Si 0.02%, C 0.01%, P 0.015%, S 0.010%. The consumable electrode was annealed by high temperature diffusion at 1150°C for 3.2h, and then welded to the auxiliary electrode.

[0034] (2) Lay a Φ270*30mm dummy plate in the middle of the bottom water tank, and then place a diameter*height*thickness of Φ250mm*60mm*0.1mm on the dummy plate, and place an arc-starting ring of the same material, with a volume of 95% Hastelloy alloy placed in the ring Arc strike debris + 5% pre-melted slag that has been fully baked, then place the Φ300*1300mm crystallizer and protective cover in sequence, install co...

Embodiment 3

[0042] Embodiment 3: The method for electroslag remelting of Hastelloy adopts the following specific processes.

[0043] (1) Electrode preparation: According to the target composition, use a 500kg vacuum induction furnace to smelt, superheat 60°C to tap the steel, and cast it into a Φ200*1800mm consumable electrode. The main components are: Ni 56.2%, Cr 16%, Mo 16.3% , Fe 4.8%, W 4.5%, Mn 0.2%, Si 0.04%, C 0.008%, P 0.011%, S 0.007%. The consumable electrode is annealed by high-temperature diffusion at 1130°C for 3.5 hours, and then welded to the auxiliary electrode.

[0044] (2) Lay a Φ260*30mm dummy plate in the middle of the bottom water tank, and then place a diameter*height*thickness of Φ240mm*60mm*0.1mm on the dummy plate with the same material as the starting arc ring, and place the volume in the ring accounting for 90% Hastelloy alloy Arc strike scraps + 10% fully baked pre-melted slag, then place the Φ300*1300mm crystallizer and protective cover in sequence, install ...

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Abstract

The invention discloses an electroslag remelting method for Hastelloy, wherein an adopted consumable electrode is subjected to high-temperature diffusion annealing at 1100-1150 DEG C, after which theelectroslag remelting is performed under the protection of argon; and the smelting rate during the electroslag remelting is 3 kg/min-3.5 kg/min. According to the electroslag remelting method, the adopted consumable electrode is subjected to high-temperature diffusion annealing firstly, the electroslag remelting is performed after homogenization is finished, low smelting speed control is adopted, and thus a uniform solidification structure of a cast ingot can be effectively guaranteed, and a Hastelloy steel ingot with uniform and excellent component structure is obtained. According to the electroslag remelting method, the matching of an electroslag slag system is guaranteed, the liquidus temperature of Hastelloy is relatively low, a shallow and flat molten pool can be obtained by adopting higher voltage and lower current in the smelting period, and therefore good surface quality can be guaranteed at a low smelting speed; and by properly increasing the filling ratio, the electroslag process is improved, the direct current component of the crystallizer in the electroslag process is increased, the lower slag temperature and the smaller molten pool volume are kept, the width of a two-phase region is reduced, the local solidification time is shortened, and a better solidification structure is obtained.

Description

technical field [0001] The invention relates to a method for electroslag remelting, in particular to a method for electroslag remelting Hastelloy. Background technique [0002] Hastelloy is a corrosion-resistant alloy with excellent performance. It has excellent performance in resistance to wet chlorine, various oxidizing chlorides, chloride salt solutions, sulfuric acid and oxidizing salts, and has good performance in low-temperature and medium-temperature hydrochloric acid. Corrosion resistance. Therefore, since the 1980s, it has been widely used in very harsh corrosive environments in petrochemical, flue gas desulfurization, pulp and paper, environmental protection and other industrial fields. [0003] At present, the smelting process of Hastelloy alloy is rarely introduced, only the subsequent heat treatment and other related processes are introduced, mainly because the smelting process of Hastelloy alloy is relatively difficult. It is generally believed that Hastelloy...

Claims

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Application Information

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Patent Type & Authority Applications(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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