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Ferronickel-based corrosion-resistant alloy and preparation method thereof

A corrosion-resistant alloy, nickel-iron-based technology, applied in the field of alloy materials and its preparation, can solve the problems of restricting the application of alloys, poor corrosion resistance of sulfuric acid, poor thermal vibration resistance, etc., to improve uniform corrosion resistance, Effect of reducing intergranular corrosion sensitivity and pitting tendency and improving wear resistance

Active Publication Date: 2021-02-19
江苏金研新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are only a handful of metals that can meet the above harsh working conditions. High-silicon cast iron can withstand sulfuric acid and phosphoric acid at all concentrations and temperatures, but it has the disadvantages of poor thermal vibration resistance and poor mechanical properties.
Ordinary stainless steel has poor corrosion resistance to sulfuric acid, and it also shows different results in phosphoric acid with the difference of materials and environments. Some applications are very successful, while others are severely corroded.
Highly alloyed nickel-based corrosion-resistant alloys have excellent corrosion resistance in acidic media, but the high price limits the application and promotion of such alloys

Method used

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  • Ferronickel-based corrosion-resistant alloy and preparation method thereof
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Effect test

Embodiment 1

[0039]The composition (wt%) of the alloy in this embodiment is: Ni 36.4%, Cr 27.9%, Mo 5.7%, Si 3.6%, Cu 0.5%, Nb 0.3%, Ce 0.012%, and the balance is iron. Its preparation process is as follows:

[0040] The alloy element raw materials were weighed according to the mass fraction of each element with an electronic balance, totaling 4.3kg. Rare earth cerium is added in the form of nickel-cerium alloy, wherein the mass fraction of cerium is 20%. After cleaning the crucible, add alloy element raw materials other than silicon and nickel-cerium alloy into the crucible of a 10kg vacuum induction furnace, close the furnace cover to vacuumize, and start feeding chemical materials after the vacuum degree in the furnace reaches 5Pa, and the power transmission power is 18.9kw, add silicon after the alloy element raw materials are purified, raise the temperature to 1500°C and refine for 5 minutes, turn off the power to cool down to the conjunctiva on the surface of the molten metal, stop ...

Embodiment 2

[0045] The composition (wt%) of the alloy in this embodiment is: Ni 37.1%, Cr 27.7%, Mo 5.7%, Si 3.3%, Cu 2.4%, Nb 1.3%, Ce 0.01%, and the balance is iron. Its preparation process is as follows:

[0046] The alloy element raw materials were weighed according to the mass fraction of each element with an electronic balance, totaling 4.3kg. Rare earth cerium is added in the form of nickel-cerium alloy, wherein the mass fraction of cerium is 20%. After cleaning the crucible, add alloy element raw materials other than silicon and nickel-cerium alloy into the crucible of a 10kg vacuum induction furnace, close the furnace cover to vacuumize, and start feeding chemical materials after the vacuum degree in the furnace reaches 5Pa, and the power transmission power is 19.2kw, add silicon after the alloy element raw materials are cleared, raise the temperature to 1503°C and refine for 5 minutes, turn off the power to cool down to the conjunctiva on the surface of the molten metal, stop v...

Embodiment 3

[0050] The composition (wt%) of the alloy in this embodiment is: Ni 36.5%, Cr 27.9%, Mo 5.7%, Si 5.11%, Cu 1.0%, Nb 0.5%, Ce 0.013%, and the balance is iron. Its preparation process is as follows:

[0051] The alloy element raw materials were weighed according to the mass fraction of each element with an electronic balance, totaling 4.3kg. Rare earth cerium is added in the form of nickel-cerium alloy, wherein the mass fraction of cerium is 20%. After cleaning the crucible, add alloy element raw materials other than silicon and nickel-cerium alloy into a 10kg vacuum induction furnace crucible, close the furnace cover and vacuumize, and start feeding chemical materials after the vacuum degree in the furnace reaches 8Pa, and the power transmission power is 24.2kw, add silicon after the alloy element raw materials are cleared, raise the temperature to 1501°C and refine for 5 minutes, turn off the power to cool down to the conjunctiva on the surface of the molten metal, stop vacuu...

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Abstract

The invention belongs to the technical field of alloy materials and preparation thereof, and particularly relates to a ferronickel-based corrosion-resistant alloy and a preparation method thereof. Thealloy comprises the following chemical components of, in percentage by weight, 35%-38% of Ni, 26%-30% of Cr, 5%-7% of Mo, 2%-6% of Si, 0.5%-3% of Cu, 0.3%-1.5% of Nb, 0.005%-0.03% of Ce, and the balance iron. The method comprises the following steps that all the alloy element raw materials are weighed, the alloy element raw materials except for silicon and cerium are added into a crucible of a vacuum induction furnace, silicon is added after the alloy element raw materials are clarified, and temperature raising refining is conducted; power cut cooling is conducted until a membrane is formed on the surface of alloy liquid, and then wacuumizing is stopped and high-purity argon filling is conducted; and power on membrane punching is conducted and a nickel-cerium alloy is added in, low-temperature refining is conducted, the alloy is cast into a mold pipe, and cutting and grinding are conducted after cooling. According to the ferronickel-based corrosion-resistant alloy and the preparationmethod thereof, by reasonably designing the types and contents of alloying elements, the ferronickel-based corrosion-resistant alloy has good casting property, mechanical property and corrosion resistance, and can be used as a pump material used in sulfuric acid, phosphoric acid and other acidic medium environments and a structural material of other chemical mechanical equipment.

Description

technical field [0001] The invention belongs to the technical field of alloy materials and their preparation, and in particular relates to a nickel-iron-based corrosion-resistant alloy and a preparation method thereof. Background technique [0002] Sulfuric acid and phosphoric acid are the two most important chemical products in the national economy. Almost all industries use sulfuric acid and phosphoric acid directly or indirectly, such as: chemical fertilizers, dyes, medicine, petroleum refining, and metal purification. Corrosion will inevitably occur in the mechanical equipment used. Parts used under certain special process conditions, such as: titanium dioxide waste acid concentration pump and phosphoric acid slurry pump, will not only suffer from severe corrosion, but also have wear of solid particles. The interaction of corrosion and wear accelerates the failure rate of equipment. [0003] At present, there are only a handful of metals that can meet the above harsh wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02C22C1/03C22C1/06
CPCC22C1/03C22C1/06C22C30/02
Inventor 谢君王道红侯桂臣周亦胄
Owner 江苏金研新材料科技有限公司