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A kind of pure nickel tube for chemical equipment falling film and preparation method thereof

A pure nickel and equipment technology, which is applied in the field of pure nickel tubes for chemical equipment falling film and its preparation, can solve the problems of increasing the cost of falling film solidification, bending deformation, dry wall, etc., to reduce local dry wall phenomenon, improve Corrosion resistance and the effect of increasing the service life

Active Publication Date: 2020-08-14
江苏隆达超合金股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Excessive content of harmful impurity elements will accelerate the corrosion and deformation of the pure nickel tube for falling film in the high temperature alkali environment. Dry wall phenomenon seriously affects the service life of falling film equipment
Frequent adjustment or replacement of pure nickel nickel tubes for falling film will greatly increase the cost of industrial falling film soda production, and at the same time seriously reduce the efficiency of solid soda production
In addition, the falling film tubes of the above materials are prone to bending deformation during use, so that during the process of alkali solidification of the falling film, the inner wall of the central tube—the pure nickel tube is unevenly formed, which affects the service life of the pure nickel tube itself, thereby increasing the falling film The cost of solid alkali reduces the efficiency of solid alkali production

Method used

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  • A kind of pure nickel tube for chemical equipment falling film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention provides a pure nickel tube for chemical equipment falling film, the specific structure is as follows figure 1 shown. It is characterized in that the formula is as follows in terms of mass percentage, including: Ni+Co≥99.0%, Ti 0.3%, and Ni-Mg alloy 0.02%. And control the content of harmful impurity elements: C≤0.01%, S≤0.01%, P≤0.01%, Cu≤0.015%, Si≤0.03%, Mn≤0.002%, Mg≤0.01%.

[0025] Its preparation process is as follows:

[0026] (1) Vacuum smelting: take electrolytic nickel, at 10 -1 MPa-10 -2 Under MPa vacuum condition, smelting at 1500°C for 3h, adding 0.3% of Ti and 0.02% of Ni-Mg alloy in terms of electrolytic nickel mass in the later stage of smelting to prepare pure nickel ingot; the ratio of Mg content in the Ni-Mg alloy is: 10%.

[0027] (2) Electroslag remelting: Electroslag remelting is performed on the pure nickel ingot prepared in step (1), the slag melting voltage is 32V, and the current is 3kA;

[0028] (3) Forging: The final forgin...

Embodiment 2

[0036] The invention provides a pure nickel tube for chemical equipment falling film, the specific structure is as follows figure 1 shown. It is characterized in that the formula is as follows in terms of mass percentage, including: Ni+Co≥99.0%, Ti 0.60%, and Ni-Mg alloy 0.04%. And control the content of harmful impurity elements: C≤0.01%, S≤0.01%, P≤0.01%, Cu≤0.015%, Si≤0.03%, Mn≤0.002%, Mg≤0.01%.

[0037] Its preparation process is as follows:

[0038] (1) Vacuum smelting: take electrolytic nickel at 10% by weight -1 MPa-10 -2 Under MPa vacuum conditions, smelting at 1600°C for 2 hours, adding 0.6% Ti and 0.04% Ni-Mg alloy in the later stage of smelting to prepare pure nickel ingots; the ratio of Mg content in the Ni-Mg alloy is 30%.

[0039] (2) Electroslag remelting: Electroslag remelting is performed on the pure nickel ingot prepared in step (1), the slag melting voltage is 40V, and the current is 1kA;

[0040] (3) Forging: The final forging temperature should not be...

Embodiment 3

[0048] The invention provides a pure nickel tube for chemical equipment falling film, the specific structure is as follows figure 1shown. It is characterized in that the formula is as follows in terms of mass percentage, including: Ni+Co≥99.0%, Ti 0.05%, and Ni-Mg alloy 0.08%. And control the content of harmful impurity elements: C≤0.01%, S≤0.01%, P≤0.01%, Cu≤0.015%, Si≤0.03%, Mn≤0.002%, Mg≤0.01%.

[0049] Its preparation process is as follows:

[0050] (1) Vacuum smelting: take electrolytic nickel, at 10 -1 MPa-10 -2 Under MPa vacuum conditions, smelting at 1550°C for 2.5h, adding 0.3% Ti and 0.02% Ni-Mg alloy in terms of electrolytic nickel mass in the later stage of smelting to prepare pure nickel ingots; the ratio of Mg content in the Ni-Mg alloy 20%.

[0051] (2) Electroslag remelting: Electroslag remelting is performed on the pure nickel ingot prepared in step (1), the slag melting voltage is 35V, and the current is 2kA;

[0052] (3) Forging: The final forging temp...

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Abstract

The invention relates to a pure-nickel tube for a chemical equipment falling film and a preparation method of the pure-nickel tube, and belongs to the field of nickel-chromium smelting and common nonferrous metal rolling. The pure-nickel tube is prepared from, by mass percentage, larger than or equal to 99.0% of Ni+Co and 0.05%-0.60% of Ti in the formula, wherein impurity elements are controlled to the situation that the percentage of Cu is smaller than or equal to 0.015%, the percentage of Si is smaller than or equal to 0.03% of Si, the percentage of Mn is smaller than or equal to 0.002%, andthe percentage of Mg is smaller than or equal to 0.01%. The pure-nickel tube is prepared through vacuum melting, electroslag remelting, forging, cross piercing, tube blank coping, combined rolling, inner hole coping and annealing. By the adoption of the formula and the process, the harmful impurity elements such as C, S and P of the pure-nickel tube for the falling film can be effectively controlled within a low limit, meanwhile, Ti is added, the strength of the nickel tube is enhanced, and the deformation resistance of the nickel tube under the working environment condition is greatly improved. Through control over the components and the machining process, the yield of products is increased, the production cost is reduced, the content of inclusions and other harmful matter is reduced, the strength and the extension property are obviously improved, and the service life of the nickel tube during use is prolonged.

Description

technical field [0001] The invention relates to a pure nickel tube for chemical equipment falling film and a preparation method thereof, belonging to the fields of nickel-chromium smelting and common non-ferrous metal rolling processing. Background technique [0002] Pure nickel tubes for chemical equipment falling film are indispensable materials in the chlor-alkali industry. In the chemical industry, caustic soda preparation equipment and caustic soda industry occupy an important position. Caustic soda is very corrosive, especially in the environment of high temperature and high concentration of alkali, which is more harmful to the corrosion of the technical materials constituting the relevant quality inspection equipment. [0003] Since my country's soda-making industry introduced the falling-film alkali-fixing energy-saving and high-efficiency soda-making process technology of Swiss Bertram Company, the traditional cauldron evaporation technology with high energy consum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22C1/03C22F1/10B23P15/00
CPCB23P15/00C22C1/023C22C1/03C22C19/03C22F1/10
Inventor 李淑苹李华兵浦益龙周向东郑晓飞
Owner 江苏隆达超合金股份有限公司
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