Low-oxygen-content lightweight wear-resistant manganese steel and preparation method thereof

Abstract

The invention discloses a preparation method of low-oxygen-content light-weight wear-resistant manganese steel, and the low-oxygen-content light-weight wear-resistant manganese steel comprises the following chemical components in percentage by mass: 0.50 to 1.30 percent of C, 0.50 to 1.00 percent of Si, 8.00 to 22.00 percent of Mn, 0.50 to 1.00 percent of Cr, 0.05 to 0.10 percent of Mo, 4.00 to 15.00 percent of Al, 0.01 to 0.03 percent of V, 0.01 to 0.03 percent of W, 0.01 to 0.03 percent of Ce, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P and the balance of iron and inevitable impurities, the oxygen content in the steel is effectively reduced only through medium-frequency electric furnace smelting, precise control of the adding time and content of aluminum and aluminum-cerium alloy, argon blowing purification, follow-up heat treatment and other processes, meanwhile, the weight is reduced by 5.0-19.0%, and the wear resistance is improved by 25% or above.

Description

Technical Field

[0001] This invention relates to the field of wear-resistant manganese steel technology, specifically to a low-oxygen-content lightweight wear-resistant manganese steel and its preparation method. Background Technology

[0002] Wear-resistant manganese steel is one of the most widely used steel wear-resistant materials, and is widely used in mining crushing, engineering infrastructure and other fields due to its excellent work hardening ability. However, this material still faces several key problems in actual production and application: In the smelting process, the high oxygen content in the steel will promote the easy oxidation of manganese to form MnO inclusions, affecting the cleanliness of the molten steel; During use, under low stress conditions, insufficient initial hardness and low work hardening rate lead to rapid wear, while under high stress conditions, deformation or fracture is likely to occur; In addition, because its density is similar to that of traditional steel, the weight of key components is too large, resulting in an additional energy consumption of about 15% during equipment operation, which is not conducive to energy conservation and consumption reduction.

[0003] With industrial restructuring and equipment upgrades, promoting the efficiency and lightweighting of engineering machinery has become an urgent industry need. Reducing the density of manganese steel to decrease component weight while simultaneously enhancing its work hardening capacity to extend service life has become a key focus of current wear-resistant material research and development, and a crucial path for energy and material conservation across the industry chain. Therefore, developing new wear-resistant manganese steels that combine low density, high hardening rate, low cost, and suitability for short-process manufacturing is of great significance for promoting the industry's green transformation and technological progress.

[0004] CN 111961805 B discloses a method, product, and application for purifying high-manganese steel molten steel. This process first uses a silicon-aluminum-barium-calcium alloy for deep deoxidation, followed by bottom nitrogen blowing and the addition of a yttrium-containing heavy rare earth alloy. The interaction between nitrogen and yttrium simultaneously achieves steel purification and microalloying, significantly improving rare earth yield and overall material performance. However, silicon-aluminum-barium-calcium alloys and heavy rare earth alloys are relatively expensive, and their addition during the smelting process increases preparation costs to some extent.

[0005] Patent CN 112522614 B discloses a method for manufacturing a long-life, toughened semi-autogenous grinding mill liner. Its chemical composition is: C: 0.80-1.60%, P≦0.03%, Si: 0.30-1.20%, S≦0.03%, Mn: 11.00-25.00%, Cr: 1.00-1.50%, Mo: 0.10-1.20%, V: 0.10-0.70%, with the remainder being Fe and unavoidable impurities. The semi-autogenous grinding mill liner steel is smelted in a medium-frequency electric furnace and purified by double-blowing argon in the furnace and ladle. Modifiers and spheroidizing agents are added to refine the as-cast microstructure and spheroidize inclusions. Combined with lost foam vibration casting and special cooling control, dispersed carbide precipitation is promoted, and the residual heat of the casting is used to achieve uniform water toughening treatment, effectively improving the microstructure uniformity and mechanical properties. However, this process relies on special tooling and precise temperature control, and the procedures are complex, difficult to implement, and require a high level of equipment and control.

[0006] Patent CN 118854178 B discloses a wear-resistant high-manganese steel and its preparation method. Its chemical composition is: C: 0.05-0.15%, Mn: 12.00-28.00%, Si: 0.30-0.90%, Mo: 0.05-0.12%, Ni: 3.00-8.00%, Al: 8.00-12.00%, V: 0.05-0.10%, Ti: 0.05-0.15%, with the remainder being Fe and unavoidable impurities. This wear-resistant high-manganese steel is primarily composed of carbon, manganese, and aluminum, with synergistic additions of silicon, molybdenum, titanium, vanadium, and nickel for multi-element alloy design and composite strengthening. This stabilizes austenite while promoting the precipitation of B2 phase and carbides, and inhibiting the coarsening of nano-phases. However, this method has an overly complex process, requiring two melting processes, multiple hot and cold rolling passes, double annealing, and laser cladding, resulting in high production costs and stringent process control requirements.

[0007] Patent CN 120174264 A discloses a high-strength, high-toughness, low-density high-manganese steel and its production method. Its chemical composition is: C: 0.65-1.00%, Si: 0.01-0.05%, Mn: 11.00-22.00%, P: ≦0.020%, S ≦0.005%, Al: 6.00-7.00%, Cr: 0.55-0.80%, with the remainder being Fe and unavoidable impurities. This high-manganese steel possesses the advantages of low density and a single, fine austenitic structure, achieving a combination of high strength and toughness with lightweight. However, its manufacturing process is extremely complex, requiring multiple steps such as continuous casting (including electromagnetic stirring), multi-stage heating, multi-pass rolling, water quenching, and bell-type annealing, significantly increasing production difficulty and cost.

[0008] In summary, to address the core issues commonly faced by manganese steel, such as poor smelting cleanliness, low initial hardness, insufficient work hardening rate, and high energy consumption due to high density, mainstream technical approaches rely on complex composition design, the use of expensive purifying agents and protective atmospheres to isolate air during smelting purification, and multi-stage heat treatment and rolling processes to optimize microstructure and properties. However, these methods generally result in long process flows and high costs, and the materials produced are difficult to meet the stringent requirements of "low cost, short process, and high performance" wear-resistant parts in actual working conditions such as mining crushing equipment in terms of cost-effectiveness and process adaptability.

[0009] In view of this, the present invention is proposed. Summary of the Invention

[0010] The purpose of this invention is to provide a low-oxygen-content lightweight wear-resistant manganese steel and its preparation method, which solves the problems of long process flow, high cost and unsatisfactory cost-effectiveness of existing technologies.

[0011] This invention is achieved through the following technical solutions:

[0012] A method for preparing a low-oxygen-content lightweight wear-resistant manganese steel, wherein the chemical composition of the low-oxygen-content lightweight wear-resistant manganese steel, based on a total mass fraction of 100%, includes: C: 0.50-1.30%, Si: 0.50-1.00%, Mn: 8.00-22.00%, Cr: 0.50-1.00%, Mo: 0.05-0.10%, Al: 4.00-15.00%, V: 0.01-0.03%, W: 0.01-0.03%, Ce: 0.01-0.03%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities; the preparation method is as follows:

[0013] (1) Scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum, ferrotungsten, and ferrovanadium raw materials are smelted in a medium-frequency induction furnace according to the proportion. The smelting temperature is controlled at ≥1550℃. After the raw materials are completely melted, pure aluminum is added for the first time 5-10 minutes to ensure the aluminum source. Deoxidation and impurity removal are carried out. After preliminary purification, the temperature of the molten steel is adjusted to 1480-1520℃. Then, pure aluminum is added for the second time to deoxidize and remove impurities.

[0014] (2) Pour the molten steel obtained in step (1) into the ladle. The ladle needs to be baked at 500℃ for 2-3 hours in advance. Al-Ce alloy is placed at the bottom of the ladle beforehand. It is then purified and modified again. After the molten steel is transferred into the ladle, it is argon-blown.

[0015] (3) After the temperature of the molten steel in step (2) drops to 1380-1420℃, the molten steel is poured into a mold and cooled to obtain a casting;

[0016] (4) The casting obtained in step (3) undergoes high-temperature quenching and tempering processes; High-temperature quenching: The casting is heated to 750~850℃ at a heating rate of 100~150℃ / h and held for ≥30min, then heated to 1050~1100℃ at a heating rate of 50-80℃ / h and held for 3-6h before being placed in water to cool to room temperature; Tempering: The casting after high-temperature quenching is heated to 350-450℃ at a heating rate of 80-100℃ / h and held for 5-10h, then removed from the furnace and air-cooled to room temperature.

[0017] Preferably, the chemical composition of the low-oxygen-content lightweight wear-resistant manganese steel, based on a total mass fraction of 100%, includes: C: 0.80-1.30%, Si: 0.75-1.00%, Mn: 15.00-22.00%, Cr: 0.75-1.00%, Mo: 0.075-0.10%, Al: 8.00-15.00%, V: 0.02-0.03%, W: 0.02-0.03%, Ce: 0.02-0.03%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

[0018] More preferably, the chemical composition of the low-oxygen-content lightweight wear-resistant manganese steel, calculated by total mass fraction of 100%, includes: C: 0.90-1.30%, Si: 0.85-1.00%, Mn: 15.00-22.00%, Cr: 0.8-1.00%, Mo: 0.075-0.10%, Al: 15.00%, V: 0.02-0.03%, W: 0.02-0.03%, Ce: 0.02-0.03%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

[0019] Preferably, the melting temperature in step (1) is controlled at 1600-1620℃.

[0020] Preferably, the high-temperature quenching treatment in step (4) is as follows: the casting is heated to 780~850℃ at a heating rate of 125~150℃ / h and held for ≥40min, then heated to 1060~1080℃ at a heating rate of 60-70℃ / h and held for 4-5h before being placed in water to cool to room temperature.

[0021] More preferably, the high-temperature quenching treatment in step (4) is as follows: the casting is heated to 800~830℃ at a heating rate of 125~130℃ / h and held for 45min, then heated to 1080℃ at a heating rate of 65℃ / h and held for 4.5h, and then placed in water to cool to room temperature.

[0022] Preferably, the tempering treatment in step (4) is as follows: the high-temperature quenched casting is heated to 380-420℃ at a heating rate of 85-90℃ / h and held for 6-8h, and then taken out of the furnace and air-cooled to room temperature.

[0023] More preferably, the tempering treatment in step (4) is as follows: the high-temperature quenched casting is heated to 420℃ at a heating rate of 90℃ / h and held for 6h, and then taken out of the furnace and air-cooled to room temperature.

[0024] This invention also protects the low-oxygen-content lightweight wear-resistant manganese steel obtained by the above method.

[0025] The beneficial effects of this invention are as follows:

[0026] 1) This invention only requires conventional medium-frequency electric furnace smelting with argon blowing purification and subsequent heat treatment, without relying on long process steps such as converter, refining, forging, and rolling. This invention effectively reduces the oxygen content in steel, purifies the molten steel, and reduces inclusions through argon blowing in the ladle and precise control of the timing and content of aluminum (Al) and aluminum-cerium (Al-Ce) alloys. Simultaneously, it achieves active control over material density, laying the foundation for the preparation of lightweight components.

[0027] 2) This invention introduces trace alloying elements such as vanadium (V) and tungsten (W), combined with appropriate heat treatment processes (high-temperature quenching aims to ensure a solid solution matrix of V and W elements and control grain size; tempering aims to control the precipitation of V- and W-rich fine carbides within the grains). It utilizes the solid solution strengthening effect of V and promotes the dispersed precipitation of V- and W-rich fine carbides within the matrix. These high-hardness precipitates not only significantly improve the initial surface hardness of the material but also act as dislocation pinning points, promoting rapid dislocation proliferation and entanglement under external forces, thereby greatly accelerating the work hardening process. Ultimately, this technology enables traditional wear-resistant manganese steel to simultaneously achieve high initial hardness and excellent work hardening capability through its own microstructure regulation, thus broadly adapting to various demanding working conditions from low-stress abrasives to high-stress impacts, achieving a good balance between adjustable performance and production feasibility.

[0028] 3) The oxygen content in the low-oxygen-content lightweight wear-resistant manganese steel obtained by this invention can be stably controlled below 30 ppm, and the density is 6.3-7.4 g / cm³. 3 Compared to the ZG120Mn18 in the national standard GB / T5680-2023 "Austenitic Manganese Steel Castings", it has a weight reduction of 5.0-19.0% and an increase in wear resistance of more than 25%, which can meet the high performance requirements of large / medium / small, thick / thin-walled wear-resistant parts in various equipment in mining, crushing and other fields.

[0029] In summary, this invention effectively reduces the oxygen content in steel, purifies the molten steel, and reduces inclusions by employing only medium-frequency electric furnace smelting, precise control of the timing and content of aluminum and aluminum-cerium alloy addition, supplemented by argon blowing purification and subsequent heat treatment. Simultaneously, it achieves active control over material density, laying the foundation for the fabrication of lightweight components. This allows traditional wear-resistant manganese steel to simultaneously achieve high initial hardness and excellent work hardening ability through its own microstructure regulation, achieving a good balance between adjustable performance and production feasibility. The resulting low-oxygen lightweight wear-resistant manganese steel has an oxygen content that can be stably controlled below 30 ppm and a density of 6.3-7.4 g / cm³. 3 Compared to the ZG120Mn18 in the national standard GB / T5680-2023 "Austenitic Manganese Steel Castings", it has a weight reduction of 5.0-19.0% and an increase in wear resistance of more than 25%, which can meet the high performance requirements of large / medium / small, thick / thin-walled wear-resistant parts in various equipment in mining, crushing and other fields. Detailed Implementation

[0030] The following is a further description of the invention, but not a limitation thereof.

[0031] Example 1:

[0032] Based on a total mass fraction of 100%, the chemical composition of a low-oxygen content lightweight wear-resistant manganese steel includes: C: 0.50%, Si: 0.50%, Mn: 8.00%, Cr: 0.50%, Mo: 0.05%, Al: 4.00%, V: 0.01%, W: 0.01%, Ce: 0.01%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

[0033] The specific preparation method is as follows:

[0034] (1) Raw materials such as scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum, ferrotungsten, and ferrovanadium are smelted in a medium-frequency induction furnace according to the proportion. The smelting temperature is 1600℃. After the raw materials are completely melted for 5 minutes, pure aluminum is added for the first time to ensure the aluminum source and to carry out deoxidation and impurity removal. The temperature of the molten steel after preliminary purification is adjusted to 1520℃ and pure aluminum is added for the second time to carry out deoxidation and impurity removal.

[0035] (2) Pour the above molten steel into the ladle. The ladle needs to be baked at 500°C for 3 hours in advance. Al-Ce alloy is placed at the bottom of the ladle beforehand for purification and modification. The molten steel is then purged with argon after being transferred into the ladle.

[0036] (3) After the temperature of the molten steel drops to 1420℃, the molten steel is poured into the mold and cooled to obtain the casting.

[0037] (4) The above-mentioned manganese steel castings are subjected to two heat treatments, namely high-temperature quenching and tempering. The specific process is as follows: First, the castings are heated to 750℃ at a heating rate of 100℃ / h and held for 60min. Then, the castings are heated to 1050℃ at a heating rate of 50℃ / h and held for 6h. The castings are then placed in water to cool to room temperature. After that, the quenched castings are heated to 350℃ at a heating rate of 80℃ / h and held for 10h. After that, the castings are taken out of the furnace and air-cooled to room temperature.

[0038] Example 2

[0039] Based on a total mass fraction of 100%, the chemical composition of a low-oxygen content lightweight wear-resistant manganese steel includes: C: 1.30%, Si: 1.00%, Mn: 15.00%, Cr: 1.00%, Mo: 0.10%, Al: 8.00%, V: 0.03%, W: 0.03%, Ce: 0.03%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

[0040] The specific preparation method is as follows:

[0041] (1) Raw materials such as scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum, ferrotungsten, and ferrovanadium are smelted in a medium-frequency induction furnace according to the proportion. The smelting temperature is 1620℃. After the raw materials are completely melted for 10 minutes, pure aluminum is added for the first time to ensure the aluminum source and to carry out deoxidation and impurity removal. The temperature of the molten steel after preliminary purification is adjusted to 1520℃ and pure aluminum is added for the second time to carry out deoxidation and impurity removal.

[0042] (2) Pour the above molten steel into the ladle. The ladle needs to be baked at 500°C for 3 hours in advance. Al-Ce alloy is placed at the bottom of the ladle beforehand for purification and modification. The molten steel is then purged with argon after being transferred into the ladle.

[0043] (3) After the temperature of the molten steel drops to 1410℃, the molten steel is poured into the mold and cooled to obtain the casting.

[0044] (4) The above-mentioned manganese steel castings are subjected to two heat treatments, namely high-temperature quenching and tempering. The specific process is as follows: First, the castings are heated to 800℃ at a heating rate of 125℃ / h and held for 45min. Then, the castings are heated to 1080℃ at a heating rate of 65℃ / h and held for 4.5h. They are then placed in water to cool to room temperature. Subsequently, the quenched castings are heated to 420℃ at a heating rate of 90℃ / h and held for 6h. After that, they are taken out of the furnace and air-cooled to room temperature.

[0045] Example 3

[0046] Based on a total mass fraction of 100%, the chemical composition of a low-oxygen content lightweight wear-resistant manganese steel includes: C: 1.30%, Si: 1.00%, Mn: 22.00%, Cr: 1.00%, Mo: 0.10%, Al: 15.00%, V: 0.03%, W: 0.03%, Ce: 0.03%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

[0047] The specific preparation method is as follows:

[0048] (1) Raw materials such as scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum, ferrotungsten, and ferrovanadium are smelted in a medium-frequency induction furnace according to the proportion. The smelting temperature is 1620℃. After the raw materials are completely melted, pure aluminum is added for the first time 8 minutes to ensure the aluminum source and to carry out deoxidation and impurity removal. The temperature of the molten steel after preliminary purification is adjusted to 1520℃ and pure aluminum is added for deoxidation and impurity removal.

[0049] (2) Pour the above molten steel into the ladle. The ladle needs to be baked at 500°C for 3 hours in advance. Al-Ce alloy is placed at the bottom of the ladle beforehand for purification and modification. The molten steel is then purged with argon after being transferred into the ladle.

[0050] (3) After the temperature of the molten steel drops to 1410℃, the molten steel is poured into the mold and cooled to obtain the casting.

[0051] (4) The above-mentioned manganese steel castings are subjected to two heat treatments, namely high-temperature quenching and tempering. The specific process is as follows: First, the castings are heated to 800℃ at a heating rate of 125℃ / h and held for 45min. Then, the castings are heated to 1080℃ at a heating rate of 65℃ / h and held for 4.5h. They are then placed in water to cool to room temperature. Subsequently, the quenched castings are heated to 420℃ at a heating rate of 90℃ / h and held for 6h. After that, they are taken out of the furnace and air-cooled to room temperature.

[0052] Example 4:

[0053] Based on a total mass fraction of 100%, the chemical composition of a low-oxygen content lightweight wear-resistant manganese steel includes: C: 0.90%, Si: 0.75%, Mn: 15.00%, Cr: 0.75%, Mo: 0.075%, Al: 15.00%, V: 0.02%, W: 0.02%, Ce: 0.02%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

[0054] The specific preparation method is as follows:

[0055] (1) Raw materials such as scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum, ferrotungsten, and ferrovanadium are smelted in a medium-frequency induction furnace according to the proportion. The smelting temperature is 1620℃. After the raw materials are completely melted, pure aluminum is added for the first time 5 minutes to ensure the aluminum source and to carry out deoxidation and impurity removal. The temperature of the molten steel after preliminary purification is adjusted to 1520℃ and pure aluminum is added for the second time to carry out deoxidation and impurity removal.

[0056] (2) Pour the above molten steel into the ladle. The ladle needs to be baked at 500°C for 3 hours in advance. Al-Ce alloy is placed at the bottom of the ladle beforehand for purification and modification. The molten steel is then purged with argon after being transferred into the ladle.

[0057] (3) After the temperature of the molten steel drops to 1410℃, the molten steel is poured into the mold and cooled to obtain the casting.

[0058] (4) The above-mentioned manganese steel castings are subjected to two heat treatments, namely high-temperature quenching and tempering. The specific process is as follows: First, the castings are heated to 800℃ at a heating rate of 125℃ / h and held for 45min. Then, the castings are heated to 1080℃ at a heating rate of 65℃ / h and held for 4.5h. They are then placed in water to cool to room temperature. Subsequently, the quenched castings are heated to 420℃ at a heating rate of 90℃ / h and held for 6h. After that, they are taken out of the furnace and air-cooled to room temperature.

[0059] Example 5

[0060] Based on a total mass fraction of 100%, the chemical composition of a low-oxygen content lightweight wear-resistant manganese steel includes: C: 0.90%, Si: 0.75%, Mn: 15.00%, Cr: 0.75%, Mo: 0.075%, Al: 15.00%, V: 0.02%, W: 0.02%, Ce: 0.02%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

[0061] The specific preparation method is as follows:

[0062] (1) Raw materials such as scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum, ferrotungsten, and ferrovanadium are smelted in a medium-frequency induction furnace according to the proportion. The smelting temperature is 1620℃. After the raw materials are completely melted for 5 minutes, pure aluminum is added for the first time to ensure the aluminum source and to carry out deoxidation and impurity removal. The temperature of the molten steel after preliminary purification is adjusted to 1520℃ and pure aluminum is added for the second time to carry out deoxidation and impurity removal.

[0063] (2) Pour the above molten steel into the ladle. The ladle needs to be baked at 500°C for 3 hours in advance. Al-Ce alloy is placed at the bottom of the ladle beforehand for purification and modification. The molten steel is then purged with argon after being transferred into the ladle.

[0064] (3) After the temperature of the molten steel drops to 1410℃, the molten steel is poured into the mold and cooled to obtain the casting.

[0065] (4) The above-mentioned manganese steel castings are subjected to two heat treatments, namely high-temperature quenching and tempering. The specific process is as follows: First, the castings are heated to 850℃ at a heating rate of 150℃ / h and held for 30 minutes, then heated to 1100℃ at a heating rate of 80℃ / h and held for 3 hours, and then placed in water to cool to room temperature; then, the quenched castings are heated to 450℃ at a heating rate of 100℃ / h and held for 5 hours, and then taken out of the furnace and air-cooled to room temperature.

[0066] Comparative Example 1

[0067] The specific composition is ZG120Mn18 steel as specified in GB / T5680-2023 "Austenitic Manganese Steel Castings", specifically: C: 1.20%, Si: 0.60%, Mn: 18.00%, S≤0.04%, P≤0.06%, with the balance being iron and unavoidable impurities. Its smelting, casting, and heat treatment adopt the methods recommended in the aforementioned standard.

[0068] Comparative Example 2:

[0069] Referring to Example 3, the difference is that aluminum was not added a second time in step (1).

[0070] Comparative Example 3

[0071] Referring to Example 3, the difference is that the preparation process did not use argon blowing technology.

[0072] Comparative Example 4

[0073] Referring to Example 3, the difference lies in the heat treatment process in step 4), which is different: First, the casting is heated to 1100°C at a heating rate of 180°C / h and held for 2 hours before being cooled in water to room temperature; then, the quenched casting is heated to 600°C at a heating rate of 150°C / h and held for 5 hours before being taken out of the furnace and air-cooled to room temperature.

[0074] Performance testing

[0075] The test results are shown in Table 1, based on the relevant indicators of the standard test examples and comparative examples below.

[0076] Oxygen content was determined according to GB / T 11261-2006 "Determination of Oxygen Content in Iron and Steel - Pulse Heating Inert Gas Melting-Infrared Absorption Method"; density was determined according to GB / T 3850-2015 "Method for Determination of Density of Dense Sintered Metals and Hard Alloys"; wear test was conducted according to T / CFA 010604-3-2016 "Test Method for Impact Abrasive Wear of Iron and Steel Materials".

[0077] Table 1 Performance Test Results

[0078] As can be seen from Table 1, the overall performance of Examples 1-5 is better than that of the comparative examples.

Claims

1. A method for preparing a low-oxygen-content, lightweight, wear-resistant manganese steel, characterized in that, The low-oxygen-content lightweight wear-resistant manganese steel has the following chemical composition, based on a total mass fraction of 100%: C: 0.50-1.30%, Si: 0.50-1.00%, Mn: 8.00-22.00%, Cr: 0.50-1.00%, Mo: 0.05-0.10%, Al: 4.00-15.00%, V: 0.01-0.03%, W: 0.01-0.03%, Ce: 0.01-0.03%. S≤0.03%, P≤0.03%, with the remainder being iron and unavoidable impurities; its preparation method is as follows: (1) Scrap steel, ferrosilicon, ferromanganese, ferrochrome, ferromolybdenum, ferrotungsten, and ferrovanadium raw materials are smelted in a medium-frequency induction furnace according to the proportion. The smelting temperature is controlled at ≥1550℃. After the raw materials are completely melted, pure aluminum is added for the first time 5-10 minutes to ensure the aluminum source, and deoxidation and impurity removal are carried out. After preliminary purification, the temperature of the molten steel is adjusted to 1480-1520℃, and then the second (2) Add pure aluminum for deoxidation and impurity removal; (3) Pour the molten steel obtained in step (1) into a ladle. The ladle needs to be baked at 500°C for 2-3 hours in advance. Al-Ce alloy is placed at the bottom of the ladle beforehand for purification and modification. The molten steel is then argon-blown after being transferred into the ladle; (4) After the temperature of the molten steel in step (2) drops to 1380-1420°C, cast the molten steel into a mold and cool it to obtain a casting; (5) The casting obtained in step (3) undergoes high-temperature quenching. The process includes: quenching and tempering; high-temperature quenching: heating the casting to 750-850℃ at a heating rate of 100-150℃ / h and holding for ≥30min, then heating to 1050-1100℃ at a heating rate of 50-80℃ / h and holding for 3-6h, then cooling in water to room temperature; tempering: heating the high-temperature quenched casting to 350-450℃ at a heating rate of 80-100℃ / h and holding for 5-10h, then removing it from the furnace and air-cooling to room temperature.

2. The method according to claim 1, characterized in that, The chemical composition of the low-oxygen-content lightweight wear-resistant manganese steel, based on a total mass fraction of 100%, includes: C: 0.80-1.30%, Si: 0.75-1.00%, Mn: 15.00-22.00%, Cr: 0.75-1.00%, Mo: 0.075-0.10%, Al: 8.00-15.00%, V: 0.02-0.03%, W: 0.02-0.03%, Ce: 0.02-0.03%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

3. The method according to claim 1, characterized in that, The chemical composition of the low-oxygen-content lightweight wear-resistant manganese steel, based on a total mass fraction of 100%, includes: C: 0.90-1.30%, Si: 0.85-1.00%, Mn: 15.00-22.00%, Cr: 0.8-1.00%, Mo: 0.075-0.10%, Al: 15.00%, V: 0.02-0.03%, W: 0.02-0.03%, Ce: 0.02-0.03%, S≤0.03%, P≤0.03%, with the balance being iron and unavoidable impurities.

4. The method according to claim 1, characterized in that, Step (1) The melting temperature is controlled at 1600-1620℃.

5. The method according to claim 1, characterized in that, Step (4) High-temperature quenching treatment is as follows: Heat the casting to 780~850℃ at a heating rate of 125~150℃ / h and hold for ≥40min, then heat to 1060~1080℃ at a heating rate of 60-70℃ / h and hold for 4-5h, then cool in water to room temperature.

6. The method according to claim 1, characterized in that, Step (4) High-temperature quenching treatment is as follows: The casting is heated to 800~830℃ at a heating rate of 125~130℃ / h and held for 45min. Then it is heated to 1080℃ at a heating rate of 65℃ / h and held for 4.5h. It is then placed in water to cool to room temperature.

7. The method according to claim 1, characterized in that, Step (4) Tempering treatment is as follows: The high-temperature quenched casting is heated to 380-420℃ at a heating rate of 85-90℃ / h and held for 6-8h, and then taken out of the furnace and air-cooled to room temperature.

8. The method according to claim 1, characterized in that, Step (4) Tempering treatment is as follows: The high-temperature quenched casting is heated to 420℃ at a heating rate of 90℃ / h and held for 6h, and then taken out of the furnace and air-cooled to room temperature.

9. The low-oxygen-content lightweight wear-resistant manganese steel obtained by the method of any one of claims 1-3.

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