Steel for super-wear-resistant conical lining plate of crusher and preparation method of steel

Abstract

The invention relates to steel for a super wear-resistant conical lining plate of a crusher and a preparation method of the steel. The steel comprises the following components in percentage by mass: 1.30 to 1.50 percent of C, 22 to 25 percent of Mn, 0.35 to 0.80 percent of Si, 2.0 to 2.5 percent of Cr, 0.1 to 0.15 percent of V, 0.06 to 0.12 percent of Ti, 0.05 to 0.08 percent of N, 0.3 to 0.6 percent of Mo, less than or equal to 0.035 percent of P, less than or equal to 0.015 percent of S and the balance of Fe and inevitable impurities. Wherein the mass ratio of Mn / C is 16-18, the mass ratio of Cr / V is 16-20, and the total mass ratio of Cr and Mo is smaller than or equal to 2.8%. The hardness of the steel can reach 289HB, the impact toughness can reach 203J / cm < 2 >, the tensile strength can reach 849MPa, the addition of a large amount of elements such as Ni and Mo is reduced, and the cost is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of wear-resistant steel, and in particular relates to a steel for a super-wear-resistant cone liner of a crusher and a preparation method thereof. Background Art

[0002] Cone crushers are mining machines used to crush ore. During operation, ore enters the cone crusher's feed port and is crushed by impact and compression in the crushing chamber formed by the mortar and crushing walls. The cone crusher liner, as a core wear-resistant component, withstands the ore's intense impact, compression, and abrasive wear over time. Especially when processing medium-hard iron ore, the liner must simultaneously possess a high surface hardness (≥50 HRC) to resist abrasive cutting and excellent impact toughness (≥150 J / cm 2 ) to prevent fracture, enhance work-hardening capabilities, and increase surface hardness even under low-impact conditions. However, traditional high-manganese steels (such as ZGMn13) have inherent flaws. Their low initial hardness (only 18-22 HRC) prevents them from fully hardening when the impact energy in the fine-crushing cavity is insufficient, resulting in a more than 30% drop in wear resistance and a shorter service life. Furthermore, carbides in the core of thick-walled castings are not completely dissolved, leaving undissolved carbides during water-toughening, which can become crack sources. Furthermore, they are highly dependent on precious metals, and the addition of elements such as Ni and Mo to enhance performance increases the cost per ton by 8-12%.

[0003] With the increasing scale of mining equipment, the service conditions of liners are becoming increasingly stringent. There is an urgent need to develop wear-resistant liners with higher hardness and strength to extend service life. Reducing product costs is also a pressing issue. Therefore, traditional liner steels struggle to meet the requirements of low cost and high performance. There is an urgent need to develop a low-cost, high-strength, high-hardness liner steel to meet market demands and promote industry development. Summary of the Invention

[0004] The present invention provides a super-wear-resistant steel for crusher cone linings and a preparation method thereof, which is used to address the current problems of insufficient hardness, short service life, and high cost of lining steel. The obtained super-wear-resistant steel for crusher cone linings has a grain size controlled at 8-10 levels, a carbide precipitate size less than 80nm, a hardness of up to 289HB, and an impact toughness of up to 203J / cm 2 The ultra-wear-resistant steel for the crusher cone liner has high hardness, high tensile strength, and excellent impact toughness. It is alloyed using only Cr, Mo, V, and Ti elements. By optimizing the ratio and proportion of the alloying elements, the coordinated effect of the elements is fully utilized, reducing the large amount of Ni, Mo and other elements added, and significantly reducing costs.

[0005] In the first aspect, the present invention relates to a steel for an ultra-wear-resistant cone liner of a crusher, which contains the following components by mass percentage: C: 1.30-1.50%, Mn: 22-25%, Si: 0.35-0.80%, Cr: 2.0-2.5%, V: 0.1-0.15%, Ti: 0.06-0.12%, N: 0.05-0.08%, Mo: 0.3-0.6%, P≤0.035%, S≤0.015%, and the balance is Fe and unavoidable impurities.

[0006] Preferably, the mass ratio of Mn / C is 16-18, the mass ratio of Cr / V is 16-20, and the total mass proportion of Cr+Mo is ≤2.8%.

[0007] Preferably, the grain size of the steel is 8 to 10, and the size of carbides precipitated in the steel is less than 80 nm.

[0008] Preferably, the hardness of the steel can reach 289HB and the impact toughness can reach 203J / cm 2 , the tensile strength can reach 849MPa.

[0009] Preferably, the steel for the ultra-wear-resistant cone liner of a crusher contains the following components by mass percentage: C: 1.4%, Mn: 23%, Si: 0.4%, Cr: 2.3%, V: 0.13%, Ti: 0.1%, N: 0.06%, Mo: 0.4%, P≤0.035%, S≤0.015%, and the remainder is Fe and unavoidable impurities.

[0010] In a second aspect, the present invention relates to a method for preparing the steel for the super-wear-resistant conical liner of a crusher, comprising the following steps: Smelting: The materials are prepared according to the chemical composition, and an electric arc furnace or a medium frequency induction furnace is used for smelting. The temperature is controlled at 1600-1650°C during the smelting process, and deoxidation and desulfurization treatment is performed; Casting: The molten steel is cast into a mold to obtain a casting, and the casting temperature is controlled at 1450-1550℃; First heat treatment: heat the casting to 850-880℃ and keep it at this temperature for 2-3 hours, then air cool it for the first heat treatment; Water toughening treatment: heat the casting to 1080-1120℃ at a rate of 40-50℃ / h and keep warm. The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the liner, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, Mo in the steel; After insulation, water quenching is performed, and the cooling rate is ≥50℃ / s; the maximum wall thickness of the lining is 40-80mm.

[0011] Second heat treatment: Heat the water-toughened casting to 580-620°C, keep it warm for 4-8 hours, and then air-cool it to room temperature.

[0012] Preferably, the water toughening treatment specifically includes: heating to 300°C at 30-40°C / h and keeping warm for 1 hour; heating to 510°C at 45°C / h and keeping warm for 2 hours; heating to 720°C at 30°C / h and keeping warm for 1.5 hours; heating to 1080-1120°C at 35°C / h and keeping warm for t; then quickly immersing in cooling water at room temperature, ensuring that the cooling water temperature does not exceed 45°C during the cooling process; The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the liner, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, and Mo elements in the steel.

[0013] The beneficial effects of the present invention are: The present invention uses only Cr, Mo, V, and Ti elements for alloying, optimizes the Mn / C mass ratio, the Cr / V mass ratio, the total mass proportion of Cr+Mo, and optimizes the ratio and proportion of the element contents, so that the components in the high manganese steel can fully exert their synergistic effects, improve the hardness and strength of the steel, reduce the large amount of addition of elements such as Ni and Mo, and greatly reduce the cost.

[0014] The preparation process adopts a three-step heat treatment process. The first heat treatment eliminates the internal stress in the liner steel processing process, reduces the possibility of deformation and cracking, and can also make the steel's structure distribution more uniform, improve the consistency of the structure, and prepare the structure for subsequent water toughening treatment.

[0015] The holding time for water-toughening treatment is dynamically adjusted based on the liner thickness. The effects of C, Si, Cr, and Mo in the steel are comprehensively considered, and appropriate coefficients are adjusted to cover the dissolution energy barrier, ensuring complete dissolution of carbides and conserving water-toughening energy. Water-toughening heating utilizes a four-step temperature ramp. The heating rate and temperature gradient for each stage are optimized based on the influence of the liner's composition on its thermal conductivity, eliminating the risk of thermal stress cracking. Furthermore, the staged temperature ramp provides the foundation for the full dissolution of carbides, further ensuring the steel's hardness and strength.

[0016] The second heat treatment promotes the re-dispersion and precipitation of nano-carbides in the steel, which are dispersed in the austenite matrix in the form of precipitates. The grain size of the steel is controlled at 8-10 levels, and the size of the precipitated carbides in the steel is less than 80nm. The hardness of the steel for the ultra-wear-resistant cone liner of the crusher prepared can reach 289HB and the impact toughness can reach 203J / cm 2, the tensile strength can reach 849MPa. The ultra-wear-resistant cone liner steel obtained from the crusher has high hardness, high tensile strength and excellent impact toughness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 The present invention discloses a schematic diagram of a process flow for preparing steel for a super-wear-resistant cone liner of a crusher. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] As mining equipment becomes larger and larger, the service conditions of liners become increasingly stringent. Existing liner steels are unable to meet the requirements of low cost and high performance. There is an urgent need to develop a low-cost, high-strength, high-hardness liner steel to extend liner service life, meet market requirements, and promote industry development.

[0021] In response to the above technical problems, an embodiment of the present invention provides a steel for an ultra-wear-resistant cone liner of a crusher, which contains the following components by mass percentage: C: 1.30-1.50%, Mn: 22-25%, Si: 0.35-0.80%, Cr: 2.0-2.5%, V: 0.1-0.15%, Ti: 0.06-0.12%, N: 0.05-0.08%, Mo: 0.3-0.6%, P≤0.035%, S≤0.015%, and the balance is Fe and unavoidable impurities.

[0022] In one embodiment, the mass ratio of Mn / C is 16-18, the mass ratio of Cr / V is 16-20, and the total mass proportion of Cr+Mo is ≤2.8%.

[0023] Carbon is an important solid solution strengthening element in high-manganese steel, enabling it to achieve both high hardness and toughness. Excessive carbon content can cause excessive lattice distortion or the precipitation of large carbides at grain boundaries, reducing the steel's plasticity. The carbon content should be controlled within a range of 1.30-1.50%.

[0024] Mn is the primary component of austenitic manganese alloy steel. Mn expands the austenite phase and stabilizes the austenitic structure. Some Mn dissolves in austenite, increasing the stability of supercooled austenite and improving its hardenability. The remaining Mn exists in carbides such as (Fe,Mn)3C and Mn7C, enhancing the strength and impact toughness of high-manganese steel. When the carbon content in steel remains constant, increasing Mn content causes the microstructure to gradually transform from pearlite to martensite and further to austenite, leading to the formation of a single austenitic structure at room temperature. Furthermore, Mn can influence the deformation mechanism of steel by affecting the stacking fault energy. As the Mn content increases, the deformation mechanism of austenitic steel gradually shifts from the TRIP effect to the TWIP effect. Therefore, the Mn content is controlled between 22% and 25%.

[0025] Si is the main element to improve the structure and morphology of carbides. When the Si content is high, it helps the eutectic carbide to have a high MC structure, which helps to improve the carbide morphology and improve the strength and wear resistance of high manganese steel. The Si control range is 0.35-0.80%.

[0026] Cr is a stabilizing element that helps improve the stability of room-temperature austenite. Cr can combine with carbon to form polymorphic carbides such as (Fe, Cr)3C. These carbides exist as dispersed hard particles in the matrix of high-manganese steel, increasing the initial hardness of the steel. Therefore, the Cr content is controlled between 2.0-2.5%.

[0027] The main function of Mo is to increase the hardenability of high manganese steel, refine the structure, and improve the strength and toughness of the matrix. The control range of Mo is 0.3-0.6%.

[0028] N can form nitrides in high manganese steel, such as TiN, VN and other wear-resistant hard spots. The effect is better when its content is in the range of 0.05-0.08%.

[0029] V has the effect of improving hardenability, forming stable carbides, and refining grains. Especially when combined with titanium, it can improve work hardening performance and wear resistance. The effect is better when the V content is controlled at 0.1-0.15%.

[0030] Ti is a strong carbide-forming element, which can refine grains, eliminate columnar crystals, form hard points (TiC, TiN), and improve wear resistance. When the titanium addition amount is 0.06-0.12%, the wear resistance can be significantly improved.

[0031] The various components in high-manganese steel work synergistically. Controlling the Mn / C mass ratio to 16-18 ensures high work-hardening ability while avoiding excessive carbides and improving toughness. Controlling the Cr / V mass ratio to 16-20 controls the size and quantity of carbides such as (Fe, Cr)3C and VC in the steel, ensuring grain refinement and ensuring the dispersion of precipitated phases. Keeping the total Cr+Mo mass ratio ≤2.8% achieves a better balance between hardness and toughness, ensuring wear resistance while avoiding degradation of impact toughness.

[0032] In one embodiment, the steel for the ultra-wear-resistant cone liner of a crusher contains the following components by mass percentage: C: 1.4%, Mn: 23%, Si: 0.4%, Cr: 2.3%, V: 0.13%, Ti: 0.1%, N: 0.06%, Mo: 0.4%, P≤0.035%, S≤0.015%, and the balance is Fe and unavoidable impurities.

[0033] like Figure 1 As shown, a method for preparing steel for a super-wear-resistant cone liner of a crusher according to an embodiment of the present invention comprises the following steps: Smelting: The materials are prepared according to the chemical composition, and an electric arc furnace or a medium frequency induction furnace is used for smelting. The temperature is controlled at 1600-1650°C during the smelting process, and deoxidation and desulfurization treatment is performed; Casting: The molten steel is cast into a mold to obtain a casting, and the casting temperature is controlled at 1450-1550℃; First heat treatment: heat the casting to 850-880℃ and keep it at this temperature for 2-3 hours, then air cool it for the first heat treatment; Water toughening treatment: heat the casting to 1080-1120℃ at a rate of 40-50℃ / h and keep warm. The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the liner, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, Mo in the steel; After insulation, water quenching is performed, and the cooling rate is ≥50℃ / s; the maximum wall thickness of the lining is 40-80mm.

[0034] Second heat treatment: Heat the water-toughened casting to 580-620°C, keep it warm for 4-8 hours, and then air-cool it to room temperature.

[0035] The present invention has no special restrictions on the smelting and casting methods of the steel for the ultra-wear-resistant cone liner of the crusher. The casting can be sand casting, metal casting, or other methods well known to those skilled in the art.

[0036] The first heat treatment is set at a temperature of 850-880℃ and kept at this temperature for 2-3 hours before air cooling. This can eliminate the internal stress in the liner steel processing process, reduce the possibility of deformation and cracking, and make the steel's microstructure more uniform, improve the consistency of the structure, and prepare the structure for subsequent water toughening treatment.

[0037] The ideal temperature for water quenching is 1080-1120°C. A temperature too low is detrimental to carbide dissolution, while a temperature too high can easily lead to overheating. The holding time t is dynamically adjusted based on the liner thickness, taking into account the influence of C, Si, Cr, and Mo in the steel. An appropriate coefficient is adjusted to cover the dissolution energy barrier, ensuring complete carbide dissolution and conserving water quenching energy. A water quenching cooling rate of ≥50°C / s ensures a single austenite structure and avoids pearlite transformation.

[0038] The second heat treatment is to reheat to 580-620℃ and keep it warm for 4-8 hours to promote the redispersion and precipitation of nano-carbides in the steel. The nano-carbides are dispersed in the austenite matrix in the form of precipitated phases, and the carbide size is less than 80nm, which further improves the hardness of the liner steel.

[0039] In one embodiment, the water toughening treatment specifically includes: heating to 300° C. at 30-40° C. / h and holding for 1 hour; heating to 510° C. at 45° C. / h and holding for 2 hours; heating to 720° C. at 30° C. / h and holding for 1.5 hours; heating to 1080-1120° C. at 35° C. / h and holding for t; then rapidly immersing in cooling water at room temperature, ensuring that the cooling water temperature does not exceed 45° C. during the cooling process; The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the liner, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, and Mo elements in the steel.

[0040] Because high-manganese steel has a very low thermal conductivity and a large thermal expansion coefficient, thermal stress is easily generated during heating. This, combined with the casting stress inherent in the casting, makes high-manganese steel castings extremely susceptible to cracking during heat treatment, especially for large parts with complex structures and large variations in wall thickness. This application preferably utilizes a four-step heating process and, based on the influence of the liner's components on its thermal conductivity, optimizes the heating rate and temperature gradient for each stage to eliminate the risk of thermal stress cracking. Furthermore, this staged heating process provides the foundation for the full dissolution of carbides, further ensuring the steel's hardness and strength.

[0041] After the above heat treatment, the alloying elements of the crusher super wear-resistant cone lining steel can fully function, the grain size of the steel is controlled at level 8-10, and the size of the carbides precipitated in the steel is less than 80nm. The hardness of the prepared crusher super wear-resistant cone lining steel can reach 289HB and the impact toughness can reach 203J / cm 2 , with a tensile strength of up to 849 MPa. The ultra-wear-resistant steel for crusher cone liners boasts high hardness, high tensile strength, and excellent impact toughness. It is alloyed using only Cr, Mo, V, and Ti elements. By optimizing the ratio and proportion of the alloying elements, the coordinated effects of the elements are fully utilized, reducing the large addition of elements such as Ni and Mo, significantly reducing costs.

[0042] Example 1: A method for preparing steel for a super-wear-resistant cone liner of a crusher, comprising the following steps: Smelting: Prepare the ingredients according to the chemical composition in Table 1, and use an electric arc furnace or a medium frequency induction furnace for smelting. During the smelting process, the temperature is controlled at 1610℃, and deoxidation and desulfurization treatment are carried out; Casting: The molten steel is cast into a casting, and the casting temperature is controlled at 1451℃; First heat treatment: heat the casting to 850℃ and keep it at this temperature for 3 hours, then air cool it for the first heat treatment; Water toughening treatment: heat the casting to 1080℃ at a rate of 40℃ / h and keep it warm. The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the lining plate, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, Mo elements in the steel; the maximum wall thickness of the lining plate is 40 mm, After holding, water quenching is performed at a cooling rate of 55°C / s; Second heat treatment: heat the water-toughened casting to 590°C, keep it at this temperature for 6 hours, and then air-cool it to room temperature.

[0043] Example 2: A method for preparing steel for a super-wear-resistant cone liner of a crusher, comprising the following steps: Smelting: Prepare the ingredients according to the chemical composition in Table 1, and use an electric arc furnace or a medium frequency induction furnace for smelting. During the smelting process, the temperature is controlled at 1620℃, and deoxidation and desulfurization treatment are carried out; Casting: The molten steel is cast into a mold to obtain a casting, and the casting temperature is controlled at 1500℃; First heat treatment: heat the casting to 860℃ and keep it at this temperature for 2.5h, then air cool it for the first heat treatment; Water toughening treatment: heat the casting to 1100℃ at a rate of 45℃ / h and keep it warm. The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the lining, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, Mo elements in the steel; the maximum wall thickness of the lining is 50 mm, After holding, water quenching is performed at a cooling rate of 56°C / s; Second heat treatment: heat the water-toughened casting to 600°C, keep it at this temperature for 5 hours, and then air-cool it to room temperature.

[0044] Example 3: A method for preparing steel for a super-wear-resistant cone liner of a crusher, comprising the following steps: Smelting: Prepare the ingredients according to the chemical composition in Table 1, and use an electric arc furnace or a medium frequency induction furnace for smelting. During the smelting process, the temperature is controlled at 1650℃, and deoxidation and desulfurization treatment are carried out; Casting: The molten steel is cast into a mold to obtain a casting, and the casting temperature is controlled at 1450℃; First heat treatment: heat the casting to 880℃ and keep it at this temperature for 2 hours, then air cool it for the first heat treatment; Water toughening treatment: heat the casting to 1120℃ at a rate of 45℃ / h and keep it warm. The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the lining plate, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, Mo elements in the steel; the maximum wall thickness of the lining plate is 60 mm, After holding, water quenching is performed at a cooling rate of 70°C / s; Second heat treatment: heat the water-toughened casting to 580°C, keep it at this temperature for 4 hours, and then air-cool it to room temperature.

[0045] Example 4: A method for preparing steel for a super-wear-resistant cone liner of a crusher, comprising the following steps: Smelting: Prepare the ingredients according to the chemical composition in Table 1, and use an electric arc furnace or a medium frequency induction furnace for smelting. During the smelting process, the temperature is controlled at 1640℃, and deoxidation and desulfurization treatment are carried out; Casting: The molten steel is cast into a mold to obtain a casting, and the casting temperature is controlled at 1550℃; First heat treatment: heat the casting to 870℃ and keep it at this temperature for 2.6h, then air cool it for the first heat treatment; Water toughening treatment: heat the casting to 1090℃ at a rate of 50℃ / h and keep it warm. The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the lining, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, Mo elements in the steel; the maximum wall thickness of the lining is 80 mm, After holding, water quenching is performed at a cooling rate of 70°C / s; Second heat treatment: heat the water-toughened casting to 620°C, keep it at this temperature for 8 hours, and then air-cool it to room temperature.

[0046] Comparative Example 1-2: The components of the preparation method of steel for super-wear-resistant cone liner of crusher in Comparative Example 1-2 are shown in Table 1, and the specific preparation process parameters are the same as those in Example 2.

[0047] The composition ratio of the steel for the super-wear-resistant cone liner of the crusher in Examples 1-4 and Comparative Examples 1-2 is shown in Table 1.

[0048] Table 1 Composition of steels in Examples 1-4 and Comparative Examples 1-2 C Mn Si Cr V Ti N Mo P S Mn / C Cr / V Cr+Mo Example 1 1.3 22 0.35 2.0 0.12 0.07 0.07 0.3 0.02 0.007 16.9 16.7 2.3 Example 2 1.4 23 0.4 2.3 0.13 0.1 0.06 0.4 0.02 0.006 16.4 17.7 2.7 Example 3 1.5 25 0.8 2.5 0.1 0.06 0.08 0.6 0.01 0.005 16.7 25 3.1 Example 4 1.5 22 0.5 2.1 0.15 0.12 0.05 0.5 0.01 0.006 14.7 14 2.6 Comparative Example 1 1.1 20 0.2 1.6 0.2 0.1 0.06 0.5 0.01 0.006 18.2 8 2.1 Comparative Example 2 1.6 28 0.6 3.0 0.08 0.05 0.06 0.2 0.03 0.01 17.5 37.5 3.2

[0049] Example 5: The method for preparing a steel for a super-wear-resistant cone liner of a crusher in Example 5 differs from that in Example 2 only in the water-toughening process: The water toughening treatment specifically includes: heating to 300°C at 30°C / h and holding for 1 hour; heating to 510°C at 45°C / h and holding for 2 hours; heating to 720°C at 30°C / h and holding for 1.5 hours; heating to 1100°C at 35°C / h and holding for t; then quickly immersing in cooling water at room temperature, ensuring that the cooling water temperature does not exceed 45°C during the cooling process; The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the lining, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, Mo elements in steel, and the maximum wall thickness of the lining is 50 mm.

[0050] Example 6: The method for preparing a steel for a super-wear-resistant cone liner of a crusher in Example 6 differs from that in Example 1 only in the water-toughening process: The water toughening treatment specifically includes: heating to 300°C at 40°C / h and holding for 1 hour; heating to 510°C at 45°C / h and holding for 2 hours; heating to 720°C at 30°C / h and holding for 1.5 hours; heating to 1080°C at 35°C / h and holding for t; then quickly immersing in cooling water at room temperature, ensuring that the cooling water temperature does not exceed 45°C during the cooling process; The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the lining, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, Mo elements in steel, and the maximum wall thickness of the lining is 40 mm.

[0051] The performance of the super-wear-resistant conical liner steels for crushers prepared in Examples 1-5 and Comparative Examples 1-2 was tested, and the results are shown in Table 1.

[0052] Table 2: Steel performance data prepared in Examples 1-5 and Comparative Examples 1-2 Hardness (HB) Tensile strength (MPa) <![CDATA[Impact toughness (J / cm 2 )]]> Example 1 270 810 185 Example 2 281 830 192 Example 3 263 795 180 Example 4 260 787 177 Example 5 289 842 193 Example 6 286 849 203 Comparative Example 1 251 760 166 Comparative Example 2 242 743 163 From Table 2, it can be found that the hardness of the steel for the ultra-wear-resistant cone liner of the crusher prepared by the present invention can reach 289HB and the impact toughness can reach 203J / cm 2 , with a tensile strength of up to 849 MPa. The ultra-wear-resistant steel for crusher cone liners boasts high hardness, high tensile strength, and excellent impact toughness. It is alloyed using only Cr, Mo, V, and Ti elements. By optimizing the ratio and proportion of the alloying elements, the coordinated effects of the elements are fully utilized, reducing the large addition of elements such as Ni and Mo, significantly reducing costs.

[0053] In Example 1-2, the Mn / C mass ratio of the components is controlled to be 16-18, the Cr / V mass ratio is 16-20, and the total mass proportion of Cr+Mo is ≤2.8%, which can better play the coordination role of the alloying elements and has better hardness, tensile strength and impact toughness than Examples 3-4.

[0054] Examples 5-6 further optimize the water toughening process and provide basic conditions for the full dissolution of carbides through staged temperature increase, further ensuring the hardness and strength properties of the steel. The performance is better than that of Examples 1-4.

[0055] In Comparative Example 1-2, the components of the alloy were changed, and the functions of the components could not be fully exerted, and the hardness, tensile strength and impact toughness of the steel were all reduced.

[0056] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A super wear-resistant cone liner steel for a crusher, characterized in that: It contains the following components by mass percentage: C: 1.30-1.50%, Mn: 22-25%, Si: 0.35-0.80%, Cr: 2.0-2.5%, V: 0.1-0.15%, Ti: 0.06-0.12%, N: 0.05-0.08%, Mo: 0.3-0.6%, P≤0.035%, S≤0.015%, and the balance is Fe and unavoidable impurities.

2. The super wear-resistant cone liner steel for a crusher according to claim 1, characterized in that: The mass ratio of Mn / C is 16-18, the mass ratio of Cr / V is 16-20, and the total mass proportion of Cr+Mo is ≤2.8%.

3. The super wear-resistant cone liner steel for a crusher according to claim 1, characterized in that: Contains the following components by mass percentage: C: 1.4%, Mn: 23%, Si: 0.4%, Cr: 2.3%, V: 0.13%, Ti: 0.1%, N: 0.06%, Mo: 0.4%, P≤0.035%, S≤0.015%, the balance is Fe and unavoidable impurities.

4. The super wear-resistant cone liner steel for a crusher according to any one of claims 1 to 3, characterized in that: The grain size of the steel is 8~10, and the size of the carbides precipitated in the steel is less than 80nm.

5. The super wear-resistant cone liner steel for a crusher according to claim 4, characterized in that: The hardness of the steel can reach 289HB and the impact toughness can reach 203J / cm 2 , the tensile strength can reach 849MPa.

6. A method for preparing a steel for a super-wear-resistant cone liner of a crusher according to any one of claims 1 to 5, characterized in that: The following steps are involved: Smelting: The materials are prepared according to the chemical composition and smelted in an electric arc furnace or a medium frequency induction furnace. The temperature is controlled at 1600-1650℃ during the smelting process, and deoxidation and desulfurization treatment are carried out; Casting: The molten steel is cast into a mold to obtain a casting, and the casting temperature is controlled at 1450-1550℃; First heat treatment: heat the casting to 850-880℃ and keep it at this temperature for 2-3 hours, then air cool it for the first heat treatment; Water toughening treatment: heat the casting to 1080-1120℃ at a rate of 40-50℃ / h and keep warm. The holding time t satisfies: t=0.018×a×[1.3×(C+Si+0.5Cr+Mo)], Where t is the holding time, unit is h; a is the maximum wall thickness of the liner, unit is mm; C, Si, Cr, Mo are the mass fractions of C, Si, Cr, and Mo in the steel; After holding, water quenching is performed, and the cooling rate is ≥50℃ / s; Second heat treatment: Heat the water-toughened casting to 580-620°C, keep it warm for 4-8 hours, and then air-cool it to room temperature.

7. The method for preparing steel for super-wear-resistant cone liner of crusher according to claim 6, characterized in that: The water toughening treatment specifically includes: first heating to 300°C at 30-40°C / h and keeping warm for 1 hour; then heating to 510°C at 45°C / h and keeping warm for 2 hours; then heating to 720°C at 30°C / h and keeping warm for 1.5 hours; finally heating to 1080-1120°C at 35°C / h and keeping warm for t; then quickly putting into cooling water at room temperature, and ensuring that the cooling water temperature does not exceed 45°C during the cooling process.

8. The method for preparing steel for super wear-resistant cone liner of crusher according to claim 6, characterized in that: The maximum wall thickness a of the lining plate is in the range of 40-80 mm.

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