Inoculating agent for improving performance of thick and large-section ultrahigh manganese steel casting and preparation method

Abstract

The invention discloses an inoculant for improving the performance of a thick and large-section ultrahigh manganese steel casting, and belongs to the field of inoculants and preparation. The inoculant is prepared from the following components in parts by mass: 80-100 parts of silicon iron; 5 to 10 parts of silicon calcium; 20 to 26 parts of chromium; 1-4 parts of manganese; 2 to 5 parts of cerium; 2 to 5 parts of vanadium; 2 to 5 parts of titanium; 1 to 3 parts of aluminum; 1 to 3 parts of niobium; 1 to 3 parts of zirconium; 0.5 to 2 parts of boron; 0.5 to 2 parts of carbon; and 15 to 20 parts of alloy powder. Through the synergistic effect of multiple components, the number of primary high-melting-point compounds of the thick and large-section ultrahigh manganese steel casting can be remarkably increased, so that grains are refined, grain boundaries are purified, defects in the casting are reduced, and the strength, toughness and wear resistance of the casting are improved. Under the severe working condition, the nucleating agent can ensure that a casting keeps stable performance, the service life is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of inoculants and preparation thereof, in particular to an inoculant for improving the performance of thick and large-section ultra-high manganese steel castings and a preparation method thereof. Background Art

[0002] Thick and large-section ultra-high manganese steel castings refer to those with larger cross-sections and manganese content exceeding the range of traditional high manganese steel. The manganese content in thick and large-section ultra-high manganese steel castings is greater than 14.0%, and even reaches 16.0% to 24.0% of alloy steel. This type of casting not only has the hard surface and flexible core of ordinary high manganese steel, and can withstand strong impact, but also exhibits more excellent wear resistance and work hardening ability due to its ultra-high manganese content.

[0003] Due to their excellent wear resistance and toughness, thick and large-section ultra-high manganese steel castings are widely used in a variety of fields, such as heavy equipment in mining, building materials, metallurgy, power and other industries, or in easily worn parts. These parts can maintain good performance for a long time in harsh working environments, thereby improving the service life and production efficiency of the equipment.

[0004] However, when the inoculants available on the market are used in thick and large-section ultra-high manganese steel castings, they cannot ensure that the castings maintain stable performance under harsh working conditions. Therefore, the service life of the castings cannot be guaranteed, increasing the maintenance cost of the castings. Summary of the invention

[0005] The present invention aims at the problems existing in the prior art. Through the synergistic effect of multiple components, the amount of primary high melting point compounds in thick and large-section ultra-high manganese steel castings can be significantly increased, thereby refining the grains, purifying the grain boundaries, reducing defects in the castings, and improving the strength, toughness, and wear resistance of the castings. Under harsh working conditions, the inoculant of the present invention can ensure that the castings maintain stable performance, extend service life, and reduce maintenance costs.

[0006] The present invention is achieved in that:

[0007] An inoculant for improving the performance of thick and large-section ultra-high manganese steel castings, wherein the inoculant is prepared from the following components in parts by mass:

[0008] Ferrosilicon: 80-100 parts;

[0009] Silicon calcium: 5-10 parts;

[0010] Chromium: 20-26 parts;

[0011] Strong: 1 to 4 servings;

[0012] Cerium: 2-5 parts;

[0013] Vanadium: 2-5 parts;

[0014] Titanium: 2-5 parts;

[0015] Aluminum: 1-3 parts;

[0016] Niobium: 1-3 parts;

[0017] Zirconium: 1-3 parts;

[0018] Boron: 0.5-2 parts;

[0019] Carbon: 0.5-2 parts;

[0020] Alloy powder: 15-20 parts.

[0021] Furthermore, the alloy powder is a mixture of two or more of ferrovanadium, ferrotitanium, ferromolybdenum, ferrochromium nitride and ferrotungsten.

[0022] Furthermore, the alloy powder is 60-200 mesh.

[0023] Furthermore, the mass ratio of cerium, vanadium and titanium is 1:1:1.

[0024] Furthermore, the mass ratio of aluminum, niobium and zirconium is 1:1:1.

[0025] Furthermore, the mass ratio of boron to carbon is 1:1:1.

[0026] The present invention also discloses a method for preparing an inoculant for improving the performance of thick and large-section ultra-high manganese steel castings, wherein the method comprises:

[0027] Weigh the raw materials in proportion (80-100 parts of ferrosilicon; 5-10 parts of calcium silicon; 20-26 parts of chromium; 1-4 parts of manganese; 2-5 parts of cerium; 2-5 parts of vanadium; 2-5 parts of titanium; 1-3 parts of aluminum; 1-3 parts of niobium; 1-3 parts of zirconium; 0.5-2 parts of boron; 0.5-2 parts of carbon; 15-20 parts of alloy powder), and mix them mechanically until they are uniform;

[0028] The mixed material is put into a vacuum induction furnace for smelting at a temperature of 1600-1700°C. After melting, it flows out through a tundish. The liquid alloy is broken into spherical particles by high-pressure airflow. After cooling, the particles are sieved to obtain an inoculant that improves the performance of thick and large-section ultra-high manganese steel castings.

[0029] Furthermore, the sieved inoculant has a particle size of 0.5-5 mm.

[0030] In the present invention, various elements, especially vanadium, niobium, zirconium, boron and carbon, are added in trace amounts to improve the microstructure and performance of cast iron. Zirconium has the functions of deoxidation, desulfurization, stabilization of austenite and refinement of pearlite. Various elements are mixed to form specific compounds or phases, which further affect the microstructure and performance of cast iron, thereby improving the wear resistance of thick and large-section ultra-high manganese steel castings.

[0031] When ferrovanadium, ferrotitanium, ferromolybdenum, ferrochromium nitride, ferrotungsten and other elements are mixed in cast iron, stable carbides can be formed to hinder grain coarsening, thus playing a significant role in improving wear resistance and stability. 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 preparation method of the inoculant for improving the performance of thick and large-section ultra-high manganese steel castings in this embodiment is:

[0035] Weigh the raw materials in proportion (88 parts of ferrosilicon; 8 parts of calcium silicon; 26 parts of chromium; 2 parts of manganese; 4 parts of cerium; 4 parts of vanadium; 4 parts of titanium; 3 parts of aluminum; 3 parts of niobium; 3 parts of zirconium; 1.6 parts of boron; 1.6 parts of carbon; 16 parts of alloy powder), and mix them mechanically until they are uniform; (the mass ratio of cerium, vanadium and titanium is 1:1:1; the mass ratio of aluminum, niobium and zirconium is 1:1:1; the mass ratio of boron and carbon is 1:1:1)

[0036] The mixed material is put into a vacuum induction furnace for smelting at a temperature of 1600-1700°C. After melting, it flows out through a tundish, and the liquid alloy is broken into spherical particles by a high-pressure airflow. After cooling, it is sieved to obtain an inoculant (the sieved inoculant particle size is 0.5-5mm) for improving the performance of thick and large-section ultra-high manganese steel castings.

[0037] Example 2

[0038] The preparation method of the inoculant for improving the performance of thick and large-section ultra-high manganese steel castings in this embodiment is:

[0039] Weigh the raw materials in proportion (100 parts of ferrosilicon; 10 parts of calcium silicon; 26 parts of chromium; 4 parts of manganese; 5 parts of cerium; 5 parts of vanadium; 5 parts of titanium; 3 parts of aluminum; 3 parts of niobium; 3 parts of zirconium; 2 parts of boron; 2 parts of carbon; 20 parts of alloy powder), and mix them mechanically until they are uniform; (the mass ratio of cerium, vanadium and titanium is 1:1:1; the mass ratio of aluminum, niobium and zirconium is 1:1:1; the mass ratio of boron and carbon is 1:1:1)

[0040] The mixed material is put into a vacuum induction furnace for smelting at a temperature of 1600-1700°C. After melting, it flows out through a tundish, and the liquid alloy is broken into spherical particles by a high-pressure airflow. After cooling, it is sieved to obtain an inoculant (the sieved inoculant particle size is 0.5-5mm) for improving the performance of thick and large-section ultra-high manganese steel castings.

[0041] Example 3

[0042] The preparation method of the inoculant for improving the performance of thick and large-section ultra-high manganese steel castings in this embodiment is:

[0043] Weigh the raw materials in proportion (80 parts of ferrosilicon; 5 parts of calcium silicon; 20 parts of chromium; 1 part of manganese; 2 parts of cerium; 2 parts of vanadium; 2 parts of titanium; 1 part of aluminum; 1 part of niobium; 1 part of zirconium; 0.5 parts of boron; 0.5 parts of carbon; 15-20 parts of alloy powder), and mix them mechanically until they are uniform; (the mass ratio of cerium, vanadium and titanium is 1:1:1; the mass ratio of aluminum, niobium and zirconium is 1:1:1; the mass ratio of boron and carbon is 1:1:1)

[0044] The mixed material is put into a vacuum induction furnace for smelting at a temperature of 1600-1700°C. After melting, it flows out through a tundish, and the liquid alloy is broken into spherical particles by a high-pressure airflow. After cooling, it is sieved to obtain an inoculant (the sieved inoculant particle size is 0.5-5mm) for improving the performance of thick and large-section ultra-high manganese steel castings.

[0045] Example 4

[0046] The preparation method of the inoculant for improving the performance of thick and large-section ultra-high manganese steel castings in this embodiment is:

[0047] Weigh the raw materials in proportion (90 parts of ferrosilicon; 6 parts of calcium silicon; 23 parts of chromium; 2 parts of manganese; 3 parts of cerium; 3 parts of vanadium; 3 parts of titanium; 2 parts of aluminum; 2 parts of niobium; 2 parts of zirconium; 0.7 parts of boron; 0.7 parts of carbon; 18 parts of alloy powder), and mix them mechanically until they are uniform; (the mass ratio of cerium, vanadium and titanium is 1:1:1; the mass ratio of aluminum, niobium and zirconium is 1:1:1; the mass ratio of boron and carbon is 1:1:1)

[0048] The mixed material is put into a vacuum induction furnace for smelting at a temperature of 1600-1700°C. After melting, it flows out through a tundish, and the liquid alloy is broken into spherical particles by a high-pressure airflow. After cooling, it is sieved to obtain an inoculant (the sieved inoculant particle size is 0.5-5mm) for improving the performance of thick and large-section ultra-high manganese steel castings.

[0049] Example 5

[0050] The preparation method of the inoculant for improving the performance of thick and large-section ultra-high manganese steel castings in this embodiment is:

[0051] Weigh the raw materials in proportion (88 parts of ferrosilicon; 7 parts of calcium silicon; 25 parts of chromium; 3 parts of manganese; 4 parts of cerium; 4 parts of vanadium; 4 parts of titanium; 2 parts of aluminum; 2 parts of niobium; 2 parts of zirconium; 0.6 parts of boron; 0.6 parts of carbon; 19 parts of alloy powder), and mix them mechanically until they are uniform; (the mass ratio of cerium, vanadium and titanium is 1:1:1; the mass ratio of aluminum, niobium and zirconium is 1:1:1; the mass ratio of boron and carbon is 1:1:1)

[0052] The mixed material is put into a vacuum induction furnace for smelting at a temperature of 1600-1700°C. After melting, it flows out through a tundish, and the liquid alloy is broken into spherical particles by a high-pressure airflow. After cooling, it is sieved to obtain an inoculant (the sieved inoculant particle size is 0.5-5mm) for improving the performance of thick and large-section ultra-high manganese steel castings.

[0053] Example 6

[0054] The preparation method of the inoculant for improving the performance of thick and large-section ultra-high manganese steel castings in this embodiment is:

[0055] Weigh the raw materials in proportion (96 parts of ferrosilicon; 8 parts of calcium silicon; 24 parts of chromium; 4 parts of manganese; 4 parts of cerium; 4 parts of vanadium; 4 parts of titanium; 1 part of aluminum; 1 part of niobium; 1 part of zirconium; 0.9 parts of boron; 0.9 parts of carbon; 16 parts of alloy powder), and mix them mechanically until they are uniform; (the mass ratio of cerium, vanadium and titanium is 1:1:1; the mass ratio of aluminum, niobium and zirconium is 1:1:1; the mass ratio of boron and carbon is 1:1:1)

[0056] The mixed material is put into a vacuum induction furnace for smelting at a temperature of 1600-1700°C. After melting, it flows out through a tundish, and the liquid alloy is broken into spherical particles by a high-pressure airflow. After cooling, it is sieved to obtain an inoculant (the sieved inoculant particle size is 0.5-5mm) for improving the performance of thick and large-section ultra-high manganese steel castings.

[0057] Example 7

[0058] The preparation method of the inoculant for improving the performance of thick and large-section ultra-high manganese steel castings in this embodiment is:

[0059] Weigh the raw materials in proportion (92 parts of ferrosilicon; 7 parts of calcium silicon; 22 parts of chromium; 2 parts of manganese; 5 parts of cerium; 5 parts of vanadium; 5 parts of titanium; 2 parts of aluminum; 2 parts of niobium; 2 parts of zirconium; 0.6 parts of boron; 0.6 parts of carbon; 17 parts of alloy powder), and mix them mechanically until they are uniform; (the mass ratio of cerium, vanadium and titanium is 1:1:1; the mass ratio of aluminum, niobium and zirconium is 1:1:1; the mass ratio of boron and carbon is 1:1:1)

[0060] The mixed material is put into a vacuum induction furnace for smelting at a temperature of 1600-1700°C. After melting, it flows out through a tundish, and the liquid alloy is broken into spherical particles by a high-pressure airflow. After cooling, it is sieved to obtain an inoculant (the sieved inoculant particle size is 0.5-5mm) for improving the performance of thick and large-section ultra-high manganese steel castings.

[0061] Example 8

[0062] The preparation method of the inoculant for improving the performance of thick and large-section ultra-high manganese steel castings in this embodiment is:

[0063] Weigh the raw materials in proportion (85 parts of ferrosilicon; 6 parts of calcium silicon; 23 parts of chromium; 2 parts of manganese; 3 parts of cerium; 3 parts of vanadium; 3 parts of titanium; 1 part of aluminum; 1 part of niobium; 1 part of zirconium; 1.5 parts of boron; 1.5 parts of carbon; 18 parts of alloy powder), and mix them mechanically until they are uniform; (the mass ratio of cerium, vanadium and titanium is 1:1:1; the mass ratio of aluminum, niobium and zirconium is 1:1:1; the mass ratio of boron and carbon is 1:1:1)

[0064] The mixed material is put into a vacuum induction furnace for smelting at a temperature of 1600-1700°C. After melting, it flows out through a tundish, and the liquid alloy is broken into spherical particles by a high-pressure airflow. After cooling, it is sieved to obtain an inoculant (the sieved inoculant particle size is 0.5-5mm) for improving the performance of thick and large-section ultra-high manganese steel castings.

[0065] 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. An inoculant for improving the performance of thick and large-section ultra-high manganese steel castings, characterized in that: The inoculant is prepared from the following components in parts by mass: Ferrosilicon: 80-100 parts; Silicon calcium: 5-10 parts; Chromium: 20-26 parts; Strong: 1 to 4 servings; Cerium: 2-5 parts; Vanadium: 2-5 parts; Titanium: 2-5 parts; Aluminum: 1-3 parts; Niobium: 1-3 parts; Zirconium: 1-3 parts; Boron: 0.5-2 parts; Carbon: 0.5-2 parts; Alloy powder: 15-20 parts.

2. The inoculant for improving the performance of thick and large-section ultra-high manganese steel castings according to claim 1, characterized in that: The alloy powder is a mixture of two or more of ferrovanadium, ferrotitanium, ferromolybdenum, ferrochromium nitride and ferrotungsten.

3. The inoculant for improving the performance of thick and large-section ultra-high manganese steel castings according to claim 2, characterized in that: The alloy powder has a mesh size of 60 to 200.

4. The inoculant for improving the performance of thick and large-section ultra-high manganese steel castings according to claim 1, characterized in that: The mass ratio of cerium, vanadium and titanium is 1:1:

1.

5. The inoculant for improving the performance of thick and large-section ultra-high manganese steel castings according to claim 1, characterized in that: The mass ratio of aluminum, niobium and zirconium is 1:1:

1.

6. The inoculant for improving the performance of thick and large-section ultra-high manganese steel castings according to claim 1, characterized in that: The mass ratio of boron to carbon is 1:1:

1.

7. A method for preparing an inoculant for improving the performance of thick and large-section ultra-high manganese steel castings, characterized in that: The method described is: Weigh the raw materials according to the proportion (ferrosilicon: 80-100 parts; calcium silicon: 5-10 parts; chromium: 20-26 parts; manganese: 1-4 parts; cerium: 2-5 parts; vanadium: 2-5 parts; titanium: 2-5 parts; aluminum: 1-3 parts; niobium: 1-3 parts; zirconium: 1-3 parts; boron: 0.5-2 parts; Carbon: 0.5-2 parts; alloy powder: 15-20 parts), and mechanically mix until uniform; The mixed material is put into a vacuum induction furnace for smelting at a temperature of 1600-1700°C. After melting, it flows out through a tundish. The liquid alloy is broken into spherical particles by high-pressure airflow. After cooling, the particles are sieved to obtain an inoculant that improves the performance of thick and large-section ultra-high manganese steel castings.

8. The method for preparing an inoculant for improving the performance of thick and large-section ultra-high manganese steel castings according to claim 7, characterized in that: The particle size of the screened inoculant is 0.5-5 mm.