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Smelting method of monel alloy

A smelting method, Monel technology, which is applied in the field of Monel alloy smelting, can solve the problems of less than 50% yield, coarse ingot grains, and difficult process control, so as to avoid cracking at the elongated grain boundary and avoid component segregation , uniform coagulation effect

Inactive Publication Date: 2019-09-27
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign monel alloys are mostly smelted by vacuum induction melting + electroslag remelting dual process. The advantages of this process are high material cleanliness and uniform tissue composition. The disadvantage is that the process control is extremely difficult, especially the electroslag process, ingot forging The cracking problem is serious, and the finished product rate is less than 50%
[0004] In recent years, there have been many research results on the forging and forming of Monel alloy, but the actual application effect is very little, mainly because the problem has not been fundamentally solved. In fact, the difficulty of forging and forming is directly related to the quality of electroslag casting ingots. The melting point is low, and the traditional electroslag process is difficult to control the low melting rate, which will inevitably cause the local solidification time to be too long, the ingot grains are coarse, and the composition segregation is serious, which will inevitably lead to cracking of the grain boundary during forging. The main reason for the difficulty of alloy forging

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: The smelting method of the Monel alloy adopts the following specific techniques.

[0030] (1) Electrode preparation: According to the target composition, use a 500kg vacuum induction furnace to smelt; wait for the vacuum in the furnace to drop to 5Pa and start power transmission; add copper plates and other materials when the first batch of materials is melted to 2 / 3; wait for all furnace materials to melt Afterwards, refining for 40 minutes under a vacuum of 1.2 Pa; after refining, fill it with argon to 2000 Pa, and fine-tune it until the composition is qualified. Keep the superheat at 50°C and tap the steel at a low temperature, pour it into a Φ200*1800mm water-cooled ingot mold, peel off the skin after cooling, and weld it to the auxiliary electrode; place it in a furnace at 200°C for 2 hours to remove welding stress.

[0031] The main components of the electrode are: Ni 66.4%, Cu 30%, Fe 2%, Mn 1%, Si 0.5%, C 0.02%, P 0.015%, S0.010%.

[0032] (2) Lay...

Embodiment 2

[0040] Embodiment 2: The smelting method of the Monel alloy adopts the following specific techniques.

[0041] (1) Electrode preparation: according to the target composition, use a 500kg vacuum induction furnace to smelt; wait for the vacuum degree in the furnace to drop to 3Pa and then start power transmission; wait for the first batch of materials to be melted for 3 / 4, add copper plates and other materials; wait for all furnace materials to melt Afterwards, refine under 1.5Pa vacuum for 50 minutes; after refining, fill with argon to 2500Pa, and fine-tune until the composition is qualified. Keep the superheat at 60°C and tap the steel at a low temperature, pour it into a Φ220*1500mm water-cooled ingot mold, peel off the skin after cooling, and weld it to the auxiliary electrode; place it in a furnace at 220°C for 1.5 hours to remove welding stress.

[0042] The main components of the electrode are: Ni 65%, Cu 31.5%, Fe 2.5%, Mn 0.5%, Si 0.2%, C 0.01%, P0.013%, S 0.015%.

[0...

Embodiment 3

[0051] Embodiment 3: The smelting method of the Monel alloy adopts the following specific techniques.

[0052] (1) Electrode preparation: According to the target composition, use a 500kg vacuum induction furnace for smelting; start power transmission after the vacuum degree in the furnace drops to 4Pa; add copper plates and other materials when the first batch of materials is melted by 70%; wait for all furnace materials to melt , refined under 1.3Pa vacuum for 60 minutes; after refining, fill it with argon to 2200Pa, and fine-tune until the composition is qualified. Keep the superheat at 45°C and tap the steel at a low temperature, pour it into a Φ200*1800mm water-cooled ingot mold, peel off the skin after cooling, and weld it to the auxiliary electrode; place it in a furnace at 250°C for 2 hours to remove welding stress.

[0053] The main components of the electrode are: Ni 70%, Cu 28%, Fe 1.1%, Mn 0.4%, Si 0.3%, C 0.01%, P0.012%, S 0.018%.

[0054] (2) Lay a Φ225*30mm dumm...

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Abstract

The invention discloses a smelting method of monel alloy. The smelting method comprises a vacuum induction smelting process and an electroslag remelting process, wherein the vacuum induction smelting process comprises the following steps of smelting a target steel grade by adopting a vacuum induction furnace, carrying out low-temperature tapping at 40-60 DEG C, and pouring into a water-cooled ingot mold to prepare a consumable electrode; the melting rate in the electroslag remelting process is 3.5kg / min-4kg / min. According to the smelting method, smelting and smelting by virtue of the vacuum induction furnace, carrying out low-superheat pouring and cooling the water-cooled ingot mold are carried out, so that the consumable electrode with low segregation, uniform structure and high quality is obtained, and then protection atmosphere electroslag remelting is carried out; and the solidification structure of the cast ingot is effectively guaranteed to be uniform, component segregation and crystal grain boundary cracking are avoided, so that the obtained cast ingot is fine in crystal grain and better in quality.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for smelting Monel alloy. Background technique [0002] Monel alloy, also known as nickel-copper alloy, is a corrosion-resistant alloy based on nickel metal and contains elements such as copper, iron, and manganese. Its structure is a high-strength single-phase austenite structure. Corrosion-resistant alloy with wide range and excellent comprehensive performance. This alloy has excellent corrosion resistance in fluorine-containing medium, also has excellent corrosion resistance to hot concentrated alkali solution, and is also resistant to corrosion by water, neutral solution, sea water, atmosphere, etc. [0003] At present, the reports on Monel alloy mainly focus on the introduction of performance research and application, and the production process is rarely introduced, mainly because the alloy is difficult to smelt and form. Domestic demand is basically based on i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22B9/18C22C19/03
CPCC22B9/18C22C1/023C22C19/002C22C19/03Y02P10/25
Inventor 张福利张晓峰牟瑞宇孙中华李博斌梁爱国李瑞杰刘海峰孙少海
Owner HEBEI IRON AND STEEL
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