Potassium-containing metal spheroidizing agent and preparation process thereof

Abstract

The invention discloses a potassium-containing metal spheroidizing agent and a preparation process thereof, and belongs to the field of spheroidizing agent preparation, and the spheroidizing agent is prepared from the following components in parts by mass: 80-100 parts of silicon iron; 20 to 30 parts of waste steel; 2 to 2.5 parts of potassium chloride; 2 to 4 parts of silicon calcium; 6 to 12 parts of calcium fluoride; 0.6 to 1 part of titanium-aluminum alloy; and 0.5-1 part of a rare earth element. The potassium salt and other functional components are mixed, so that the surface tension and viscosity of molten iron are reduced, the molten iron is better in fluidity in the casting process, a complex casting mold cavity is easier to fill, the defects of cold shut, insufficient casting and the like are reduced, and the toughness and ductility are improved.

Description

Technical Field

[0001] The invention belongs to the field of preparation of spheroidizing agents, in particular to a potassium-containing metal spheroidizing agent and a preparation process thereof. Background Art

[0002] As we all know, spheroidizers usually refer to metal spheroidizers containing core components such as ferrosilicon, rare earth elements, and magnesium. These components play a key role in the spheroidizing process, and they mainly rely on ferrosilicon, rare earth elements, and magnesium to achieve the spheroidizing effect. Ordinary metal spheroidizers are widely used in the production of various ductile irons, and can meet general spheroidizing needs, but they have wider applications in certain specific fields, especially in situations where it is necessary to improve the strength and toughness of castings, or where desulfurization and degassing are required. Ordinary spheroidizers cannot achieve the specific performance and uses of spheroidizers. For areas with high requirements for toughness and ductility, the spheroidizers on the market can no longer meet the requirements. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention discloses a potassium-containing metal spheroidizer, which helps to reduce the surface tension and viscosity of molten iron through the mixing of potassium salt and other functional components, so that the molten iron has better fluidity in the casting process, is easier to fill complex casting cavities, reduces the occurrence of defects such as cold shut and insufficient pouring, and improves toughness and ductility.

[0004] The present invention is achieved in that:

[0005] A potassium metal spheroidizer, characterized in that, in parts by mass, the spheroidizer is prepared from the following components:

[0006] Ferrosilicon: 80-100 parts;

[0007] Scrap steel: 20-30 parts;

[0008] Potassium chloride: 2-2.5 parts;

[0009] Silicon calcium: 2-4 parts;

[0010] Calcium fluoride: 6-12 parts;

[0011] Titanium aluminum alloy: 0.6 to 1 part;

[0012] Rare earth elements: 0.5 to 1 part.

[0013] Furthermore, the rare earth element includes one or more of lanthanum, cerium and yttrium.

[0014] Furthermore, the titanium-aluminum alloy is a titanium-aluminum alloy powder obtained by crushing and pulverizing titanium-aluminum metal ingots, and the particle size is 6 to 8 meshes.

[0015] Furthermore, the titanium aluminum alloy powder may be of a type selected from TiAl4822 or TiAl30.

[0016] Furthermore, the mass ratio of the ferrosilicon and potassium chloride is 50:1.

[0017] Furthermore, the mass ratio of calcium silicon to calcium fluoride is 1:3.

[0018] Further, the spheroidizing agent is prepared from the following components in parts by mass:

[0019] Ferrosilicon: 90 parts;

[0020] Scrap steel: 28 parts;

[0021] Potassium chloride: 2.25 parts;

[0022] Silicon calcium: 3 parts;

[0023] Calcium fluoride: 9 parts;

[0024] Titanium aluminum alloy: 0.9 parts;

[0025] Rare earth elements: 0.7 parts.

[0026] A preparation process of a potassium-containing metal spheroidizer, characterized in that the process comprises: mechanically mixing ferrosilicon (80-100 parts), scrap steel (20-30 parts), potassium chloride (2-2.5 parts), calcium silicon (2-4 parts), calcium fluoride (6-12 parts), titanium aluminum alloy (0.6-1 part), and rare earth elements (0.5-1 part) according to corresponding parts by mass, heating the mixture to a molten state, and then casting, cooling, and crushing the mixture into spheroidizer blocks.

[0027] Further, after mixing, the mixture is heated in a heating reactor at a temperature of 900±50°C.

[0028] The beneficial effects of the present invention compared with the prior art are:

[0029] In the present invention, the addition of potassium chloride can improve the fluidity of molten iron, which is particularly beneficial for producing castings with complex shapes and thin walls. In addition, the roundness and uniformity of graphite nodules can be improved. Potassium chloride can affect the growth process of graphite nodules, causing the graphite nodules to grow more rounded and uniform, and the distribution is also more dense. This helps to improve the mechanical properties of ductile iron, especially toughness and ductility, so that the castings perform better when subjected to dynamic loads and impacts.

[0030] The potassium chloride in the present invention can also purify the molten iron and reduce the adverse effects of impurities on the spheroidization effect and casting performance. The potassium-containing spheroidizing agent of the present invention improves the stability of the spheroidization effect to a certain extent, prolongs the action time of the spheroidizing agent, slows down the speed of spheroidization decay, and can still maintain a good spheroidization effect for a long time or under some conditions that are not conducive to spheroidization, which is conducive to ensuring the consistency of casting quality.

[0031] The scrap steel in the raw materials of the present invention may show better adaptability to some molten iron containing specific impurity elements or having special components under the casting process conditions of the present invention, and can more effectively achieve spheroidization, obtain good casting quality, and broaden the application scope of the spheroidizer. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail by enumerating examples below. It should be noted that the specific implementation described here is only used to explain the present invention and is not used to limit the present invention.

[0033] Example 1

[0034] The spheroidizing agent in this embodiment is prepared from the following components by mass: 90 parts of ferrosilicon; 28 parts of scrap steel; 2.25 parts of potassium chloride; 3 parts of calcium silicon; 9 parts of calcium fluoride; 0.9 parts of titanium aluminum alloy; and 0.7 parts of rare earth elements.

[0035] The above-mentioned parts by mass of ferrosilicon, scrap steel, potassium chloride, calcium silicon, calcium fluoride, titanium aluminum alloy and rare earth elements are mechanically mixed, and after mixing, heated in a heating reactor to a molten state of the alloy (the reactor temperature is 900±50°C), and then cast, cooled and broken into spheroidizing agent blocks.

[0036] Example 2

[0037] The spheroidizing agent in this embodiment is prepared from the following components in parts by mass: 80 parts of ferrosilicon; 20 parts of scrap steel; 2 parts of potassium chloride; 2 parts of calcium silicon; 6 parts of calcium fluoride; 0.6 parts of titanium aluminum alloy; and 0.5 parts of rare earth elements.

[0038] The above-mentioned parts by mass of ferrosilicon, scrap steel, potassium chloride, calcium silicon, calcium fluoride, titanium aluminum alloy and rare earth elements are mechanically mixed, and after mixing, heated in a heating reactor to a molten state of the alloy (the reactor temperature is 900±50°C), and then cast, cooled and broken into spheroidizing agent blocks.

[0039] Example 3

[0040] The spheroidizing agent in this embodiment is prepared from the following components in parts by mass: 100 parts of ferrosilicon; 30 parts of scrap steel; 2.5 parts of potassium chloride; 4 parts of calcium silicon; 12 parts of calcium fluoride; 1 part of titanium aluminum alloy; and 1 part of rare earth elements.

[0041] The above-mentioned parts by mass of ferrosilicon, scrap steel, potassium chloride, calcium silicon, calcium fluoride, titanium aluminum alloy and rare earth elements are mechanically mixed, and after mixing, heated in a heating reactor to a molten state of the alloy (the reactor temperature is 900±50°C), and then cast, cooled and broken into spheroidizing agent blocks.

[0042] Example 4

[0043] The spheroidizing agent in this embodiment is prepared from the following components in parts by mass: 90 parts of ferrosilicon; 21 parts of scrap steel; 2.25 parts of potassium chloride; 3 parts of calcium silicon; 9 parts of calcium fluoride; 0.7 parts of titanium aluminum alloy; and 0.6 parts of rare earth elements.

[0044] The above-mentioned parts by mass of ferrosilicon, scrap steel, potassium chloride, calcium silicon, calcium fluoride, titanium aluminum alloy and rare earth elements are mechanically mixed, and after mixing, heated in a heating reactor to a molten state of the alloy (the reactor temperature is 900±50°C), and then cast, cooled and broken into spheroidizing agent blocks.

[0045] Example 5

[0046] The spheroidizing agent in this embodiment is prepared from the following components in parts by mass: 88 parts of ferrosilicon; 27 parts of scrap steel; 2.2 parts of potassium chloride; 2 parts of calcium silicon; 6 parts of calcium fluoride; 0.7 parts of titanium aluminum alloy; and 0.6 parts of rare earth elements.

[0047] The above-mentioned parts by mass of ferrosilicon, scrap steel, potassium chloride, calcium silicon, calcium fluoride, titanium aluminum alloy and rare earth elements are mechanically mixed, and after mixing, heated in a heating reactor to a molten state of the alloy (the reactor temperature is 900±50°C), and then cast, cooled and broken into spheroidizing agent blocks.

[0048] Example 6

[0049] The spheroidizing agent in this embodiment is prepared from the following components in parts by mass: 96 parts of ferrosilicon; 23 parts of scrap steel; 2.4 parts of potassium chloride; 4 parts of calcium silicon; 12 parts of calcium fluoride; 0.9 parts of titanium aluminum alloy; and 0.5 parts of rare earth elements.

[0050] The above-mentioned parts by mass of ferrosilicon, scrap steel, potassium chloride, calcium silicon, calcium fluoride, titanium aluminum alloy and rare earth elements are mechanically mixed, and after mixing, heated in a heating reactor to a molten state of the alloy (the reactor temperature is 900±50°C), and then cast, cooled and broken into spheroidizing agent blocks.

[0051] Example 7

[0052] The spheroidizing agent in this embodiment is prepared from the following components in parts by mass: 96 parts of ferrosilicon; 23 parts of scrap steel; 2.4 parts of potassium chloride; 3 parts of calcium silicon; 9 parts of calcium fluoride; 0.8 parts of titanium aluminum alloy; and 0.7 parts of rare earth elements.

[0053] The above-mentioned parts by mass of ferrosilicon, scrap steel, potassium chloride, calcium silicon, calcium fluoride, titanium aluminum alloy and rare earth elements are mechanically mixed, and after mixing, heated in a heating reactor to a molten state of the alloy (the reactor temperature is 900±50°C), and then cast, cooled and broken into spheroidizing agent blocks.

[0054] The performance of the spheroidizing agent block in the above embodiment was tested in actual application, and the results are as follows:

[0055]

[0056]

[0057] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A potassium metal spheroidizing agent, characterized in that: The spheroidizing agent is prepared from the following components in parts by mass: Ferrosilicon: 80-100 parts; Scrap steel: 20-30 parts; Potassium chloride: 2-2.5 parts; Silicon calcium: 2-4 parts; Calcium fluoride: 6-12 parts; Titanium aluminum alloy: 0.6 to 1 part; Rare earth elements: 0.5 to 1 part.

2. A potassium metal spheroidizing agent according to claim 1, characterized in that: The rare earth elements include one or more of lanthanum, cerium and yttrium.

3. A potassium metal spheroidizing agent according to claim 1, characterized in that: The titanium-aluminum alloy is a titanium-aluminum alloy powder obtained by crushing and pulverizing titanium-aluminum metal ingots, and the particle size is 6-8 meshes.

4. A potassium metal spheroidizing agent according to claim 3, characterized in that: The titanium aluminum alloy powder may be of type TiAl4822 or TiAl30.

5. A potassium metal spheroidizing agent according to claim 1, characterized in that: The mass ratio of the ferrosilicon and potassium chloride is 50:

1.

6. A potassium metal spheroidizing agent according to claim 1, characterized in that: The mass ratio of calcium silicon to calcium fluoride is 1:

3.

7. The potassium metal spheroidizing agent according to claim 1, wherein the spheroidizing agent is prepared from the following components in parts by mass: Ferrosilicon: 90 parts; Scrap steel: 28 parts; Potassium chloride: 2.25 parts; Silicon calcium: 3 parts; Calcium fluoride: 9 parts; Titanium aluminum alloy: 0.9 parts; Rare earth elements: 0.7 parts.

8. A process for preparing a potassium-containing metal spheroidizing agent, characterized in that: The process is as follows: according to corresponding mass parts, ferrosilicon (80-100 parts), scrap steel (20-30 parts); potassium chloride (2-2.5 parts); calcium silicon (2-4 parts); calcium fluoride (6-12 parts); titanium aluminum alloy (0.6-1 part); and rare earth elements (0.5-1 part) are mechanically mixed, and after mixing, the mixture is heated to a molten state of the alloy, and then poured, cooled, and broken into spheroidizing agent blocks.

9. The process for preparing a potassium-containing metal spheroidizing agent according to claim 8, characterized in that: After mixing, heat in a heating reactor with the reactor temperature at 900±50°C.

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