High manganese steel for crusher lining plate and heat treatment method of high manganese steel

Abstract

In order to solve the problem that the service life of existing high-manganese steel for the lining plate of the crusher is short, the high-manganese steel for the lining plate of the crusher and the heat treatment method of the high-manganese steel are provided, and the high-manganese steel for the lining plate of the crusher is prepared from, by mass, 1.15%-1.45% of C, 17%-19% of Mn, 2.5%-5.0% of Cr, 0.45%-0.6% of Mo, 0.2%-0.4% of Ti, 0.02%-0.06% of Re, smaller than or equal to 0.045% of P and smaller than or equal to 0.045% of S. The heat treatment method of the high manganese steel for the crusher lining plate comprises water toughening treatment and dispersion treatment. According to the high-manganese steel, the proportion of all components is optimized, the high-manganese steel lining plate is subjected to heat treatment, the toughness and wear resistance of the high-manganese steel are improved, the performance of the thick-wall lining plate of the crusher is improved, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of crusher lining production, and more specifically, relates to a high manganese steel for crusher lining and a heat treatment method. Background Art

[0002] There are some thick-walled linings in thick-walled cone crushers, with a thickness of more than 140MM, and the production difficulty is correspondingly higher, such as Figure 1 As shown. At present, there are three main types of high manganese steel used in crusher liners. One is C1.05-1.35% by mass, Mn11.0-14.0%, Cr0.1-3.0%, P≤0.05%, S≤0.05% (or add RE0.2% or so), and the heat treatment process is water toughening. The second component mass percentage is C1.1-1.6%, Mn16-22%, Cr0.1-0.6%, Ti≤0.1%, P≤0.05%, S≤0.05%, and the heat treatment process is water toughening. The third component mass percentage is C0.95-1.35%, Mn16-20%, Cr1.5-2.5%, Mo0.45-0.6%, Si0.6-0.8%, RE0.2%, P≤0.05%, S≤0.05%, and the heat treatment process is 1100℃ water toughening. The purpose of using thick-walled liners is to extend the service life. The service life of the second liner is longer than that of the first high manganese steel, but shorter than that of the third. The service life of the third liner is about 15% longer than that of ordinary high manganese steel.

[0003] Since the crusher lining plate has to bear friction and impact during use, especially the thick wall lining plate has a long service life and is subject to high impact frequency, the lining plate must have high toughness and high wear resistance. Therefore, it is necessary to further develop high manganese steel for crusher lining plates. Summary of the invention

[0004] The purpose of the present invention is to provide a high manganese steel for a crusher liner and a heat treatment method thereof in order to solve the problem that the existing high manganese steel for a crusher liner has a short service life.

[0005] The high manganese steel of the invention optimizes the distribution ratio of each group, and heat-treats the high manganese steel liner, thereby improving the toughness and wear resistance of the high manganese steel, improving the performance of the crusher thick-wall liner, and extending its service life.

[0006] According to one aspect of the present invention, a high manganese steel for a crusher liner is provided, wherein the mass percentage of each component includes C1.15-1.45%, Mn17-19%, Cr2.5-5.0%, Mo0.45-0.6%, Ti0.2-0.4%, Re0.02-0.06%, P≤0.045%, and S≤0.045%.

[0007] According to another aspect of the present invention, a heat treatment method for high manganese steel for crusher lining is provided, comprising the following steps:

[0008] 1) Water toughening to austenitize

[0009] The crusher lining is cast and processed into a lining with high manganese steel, and then the lining is heated to 1060-1090°C, kept warm for 8-12 hours, and then quickly taken out of the furnace for water quenching, i.e., water toughening treatment, to obtain a high manganese steel lining with austenite structure;

[0010] 2) Diffusion treatment

[0011] The high manganese steel lining after water toughening is sent to the heat treatment furnace for treatment, the temperature is raised to 260-280℃, and kept warm for 1.5-2 hours to obtain a 30-50mm deep dispersion treatment structure, which plays a role in surface strengthening.

[0012] Furthermore, the heat treatment method of the high manganese steel for the crusher liner mentioned above also includes:

[0013] Step 3) Detect the effect of diffusion treatment

[0014] The metallographic structure of the high manganese steel lining after dispersion treatment was tested to observe the dispersion effect.

[0015] Compared with the prior art, the advantages of the present invention are:

[0016] After the thick-walled cone crusher liner adopts the material and heat treatment method of the present invention, the service life of the liner is significantly improved. After dispersion treatment, a dispersion layer will be formed at 30-50MM on the surface of the liner. Dispersed carbides are evenly distributed on the surface of the dispersion layer to form hard points, increase wear resistance, and play a surface strengthening effect. When the liner is installed and used, it plays a wear-resistant role, especially before the stress effect reaches the hardening effect, the wear-resistant protection effect is obvious. The center of the liner is not dispersed, and under high-impact working conditions, stress concentration and defect cracking tendency are reduced, thereby further extending the service life of the liner. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of cone crusher liner structure.

[0018] Figure 2 This is a metallographic structure diagram of the liner after dispersion treatment in Example 2 of the present invention, magnified 100 times;

[0019] Figure 3 This is a metallographic structure diagram of the liner after dispersion treatment in Example 2 of the present invention, magnified 500 times;

[0020] Figure 4This is a metallographic structure diagram of a liner plate of the comparative example of the present invention which has not been subjected to dispersion treatment and is magnified 100 times;

[0021] Figure 5 This is a metallographic structure diagram of a liner plate of the comparative example of the present invention which has not been subjected to dispersion treatment and is magnified 500 times. DETAILED DESCRIPTION

[0022] According to one aspect of the present invention, this embodiment proposes a high manganese steel for a crusher liner, wherein the mass percentage of each component includes C1.15-1.45%, Mn17-19%, Cr2.5-5.0%, Mo0.45-0.6%, Ti0.2-0.4%, Re0.02-0.06%, P≤0.045%, and S≤0.045%.

[0023] Among them, the C element is an austenite-forming element, so it can expand the austenite phase area and stabilize the austenite structure. The carbon element is dissolved in the austenite grains, which can produce a strong solid solution strengthening effect, improve the hardness, strength and wear resistance. On the basis of ensuring other properties, the C content can be increased appropriately. In this design, the C content is 1.15-1.45%.

[0024] Mn element: During use, manganese forms a solid solution with iron, which improves the hardness and strength of steel. It is also a carbide-forming element. It reduces the critical transition temperature, refines the grains, increases the hardenability of steel, expands the austenite zone, and avoids the aggregation of carbides in the carburized layer. The Mn content in this design is Mn17-19%.

[0025] Cr element: It enhances the hardenability of steel and has a secondary hardening effect, which can improve the hardness and wear resistance of steel. However, as the content increases, the brittleness and quenching cracking increase. Therefore, the chromium content of this design is controlled at 2.5-5.0%.

[0026] Mo element: It improves the hardenability of steel and prevents temper brittleness. Mo has a solid solution strengthening effect and also improves the stability of carbides, thereby increasing the strength of steel. From a cost perspective, the effect of increasing more than 0.6% is not obvious, so the molybdenum content is controlled at 0.45-0.6%.

[0027] Ti element: It can refine the grains, improve the plasticity and toughness of steel, increase the tempering stability and prevent tempering brittleness. When the content exceeds 0.4%, the enhanced performance is not obvious, so the Ti element is controlled at 0.2-0.4%.

[0028] Re element: It is called the industrial "vitamin" and industrial "gold". It can refine grains, purify tissues, and significantly improve strength, hardness, wear resistance and other properties.

[0029] P element: a harmful element that easily forms phosphides at grain boundaries, reducing the plasticity and toughness of steel and increasing its brittleness. It should be strictly controlled, P ≤ 0.045%.

[0030] S element: a harmful element that increases brittleness. Manganese has a desulfurizing effect. Generally, the S content in high manganese steel is low, S≤0.045%.

[0031] According to another aspect of the present invention, this embodiment provides a heat treatment method for high manganese steel for crusher lining, comprising the following steps:

[0032] 1) Water toughening to austenitize

[0033] The crusher lining is cast and processed into a lining with high manganese steel, and then the lining is heated to 1060-1090°C, kept warm for 8-12 hours, and then quickly taken out of the furnace for water quenching, i.e., water toughening treatment, to obtain a high manganese steel lining with austenite structure;

[0034] 2) Diffusion treatment

[0035] The high manganese steel lining after water toughening is sent to the heat treatment furnace for treatment, the temperature is raised to 260-280℃, and kept warm for 1.5-2 hours to obtain a 30-50mm deep dispersion treatment structure, which plays a role in surface strengthening.

[0036] It may also include step 3) detecting the effect of the diffusion treatment

[0037] The metallographic structure of the high manganese steel lining after dispersion treatment was tested to observe the dispersion effect.

[0038] After the thick-walled cone crusher liner adopts this material and heat treatment method, the service life of the liner is significantly improved. After dispersion treatment, a dispersion layer will be formed at 30-50MM on the surface of the liner. The surface of the dispersion layer is evenly distributed with dispersed carbides to form hard points, which increases wear resistance and plays a surface strengthening effect. When the liner is installed and used, it plays a wear-resistant role, especially before the stress effect reaches the hardening effect, the wear-resistant protection effect is obvious. The center of the liner is not dispersed, which reduces stress concentration and defect cracking tendency under high impact working conditions, thereby further extending the service life of the liner.

[0039] Comparative Example

[0040] like Figure 1As shown, the section line is a thick-walled liner. A set of cone crusher liner with a wall thickness of 145MM is made. The mass percentage of the liner is C1.23%, Mn13.2%, Cr1.86%, Mo0.0.36%, Re0.018%, P0.050%, S≤0.013%. The liner is heated to 1080℃ and kept warm for 8 hours. After the heat preservation, it is quickly taken out of the furnace for water quenching, that is, water toughening treatment, to obtain austenite structure. The installation test is carried out. Compared with ordinary high manganese steel liner, the service life of the installation can be increased by more than 10%.

[0041] Example 1

[0042] A set of cone crusher lining plates with a wall thickness of 145MM is made. The mass percentage of the lining plates is C1.36%, Mn18.3%, Cr4.2%, Mo0.48%, Ti0.38%, Re0.021%, P0.043%, S0.013%. The lining plates are heated to 1080℃ and kept warm for 8 hours. After keeping warm, they are quickly taken out of the furnace for water quenching, i.e. water toughening treatment, to obtain austenite structure. The lining plates after water toughening treatment are sent to the heat treatment furnace and heated to 280℃, kept warm for 1.5 hours, and then dispersed. Then the lining plates are installed and used for testing. Compared with ordinary high manganese steel lining plates, the service life can be increased by more than 35%.

[0043] Example 2

[0044] A set of cone crusher lining plates with a wall thickness of 190MM is produced, and the mass percentage of the lining plates is C1.28%, Mn18.6%, Cr3.1%, Mo0.52%, Ti0.35%, Re0.026%, P0.041%, S0.015%. The lining plates are heated to 1080℃ and kept warm for 10 hours. After the heat preservation, they are quickly taken out of the furnace for water quenching, i.e. water toughening treatment, to obtain austenite structure. The lining plates after water toughening treatment are sent to the heat treatment furnace to heat up to 260℃, kept warm for 2 hours, and then dispersed. Compared with ordinary high manganese steel lining plates, the service life of the installed machine can be increased by more than 30%.

[0045] The ultra-high manganese steel after dispersion treatment in Example 1 was compared with the ultra-high manganese steel without dispersion treatment in the comparative example. Figure 2 To magnify the metallographic structure of high manganese steel after dispersion treatment at 100 times, it can be observed that the particles are evenly distributed on the surface of austenite. After the metallographic detection is magnified to 500 times, it can be observed that the carbides are round and evenly distributed in size. Figure 4 and Figure 5 This is the metallographic structure of high manganese steel that has not undergone dispersion treatment and has no dispersion points.

[0046] Therefore, after the thick-walled cone crusher liner adopts the material and heat treatment method of the present invention, the service life of the liner is significantly improved. After the dispersion treatment, a dispersion layer will be formed at 30-50MM on the surface of the liner. The surface of the dispersion layer is evenly distributed with dispersed carbides to form hard points, which increases wear resistance and has a surface strengthening effect. When the liner is installed and used, it plays a wear-resistant role, especially before the stress effect reaches the hardening effect, the wear-resistant protection effect is obvious. The center of the liner is not dispersed, and under high-impact working conditions, stress concentration and defect cracking tendency are reduced, thereby further extending the service life of the liner.

Claims

1. A high manganese steel for crusher lining, characterized in that: The mass percentage of each component includes: C1.15-1.45%, Mn17-19%, Cr2.5-5.0%, Mo0.45-0.6%, Ti0.2-0.4%, Re0.02-0.06%, P≤0.045%, S≤0.045%.

2. A heat treatment method for high manganese steel for crusher lining, characterized in that: The steps include: 1) Water toughening to austenitize The crusher lining is cast and processed into a lining with high manganese steel, and then the lining is heated to 1060-1090°C, kept warm for 8-12 hours, and then quickly taken out of the furnace for water quenching, i.e., water toughening treatment, to obtain a high manganese steel lining with austenite structure; 2) Diffusion treatment The high manganese steel lining after water toughening is sent to the heat treatment furnace for treatment, the temperature is raised to 260-280℃, and kept warm for 1.5-2 hours to obtain a 30-50mm deep dispersion treatment structure, which plays a role in surface strengthening.

3. The heat treatment method for high manganese steel for crusher liner according to claim 2, characterized in that: Also includes: Step 3) Detect the effect of diffusion treatment The metallographic structure of the high manganese steel liner after dispersion treatment was tested to observe the dispersion effect.

Images