High-wear-resistance and high-toughness forged steel alloy material for semi-autogenous mill liners, forming method therefor, and use thereof

Abstract

Disclosed is a high-wear-resistance and high-toughness forged steel alloy material for semi-autogenous mill liners, having high production efficiency and providing wear-resistant liners with high-quality wear resistance and high toughness. The present invention addresses problems in the existing technology by developing a novel forged wear-resistant liner. Liners manufactured by a forging process not only improve wear resistance, but also reduce the frequency of maintenance and replacement, lower production costs, ensure long-term stable operating conditions of machines, and bring significant benefits to industrial production.

Description

High wear-resistant and high toughness forged steel alloy materials for semi-autogenous mill liners, their forming methods and applications Technical Field

[0001] This invention belongs to the field of steel preparation technology, and relates to a high wear-resistant and high toughness forged steel alloy material for semi-autogenous grinding mill liners, its forming method, and its application. Background Technology

[0002] Semi-autogenous mill liners are wear-resistant materials whose primary function is to protect the mill cylinder from direct impact and friction from the grinding media and materials. They also enhance the crushing effect on materials by adjusting the motion of the grinding media, thereby improving the mill's grinding efficiency and output while reducing metal consumption. Key considerations include the lifting effect on the grinding media, the media's trajectory, and operating conditions. These liners possess excellent wear and impact resistance, high strength, and high toughness, maintaining their wear resistance under high-intensity, high-frequency impacts. They are also resistant to breakage and damage while withstanding high wear, ensuring a long service life. This wear-resistant material is widely used in mining, mineral processing, and other industrial fields. Especially in mineral processing, the semi-autogenous mill, as a key piece of equipment for grinding ore into powder and separating the desired minerals, directly impacts the efficiency and cost of its wear-resistant liners.

[0003] Traditional cast liners are mainly produced through casting. Problems include unstable alloying elements in the raw materials, and defects such as shrinkage porosity and slag inclusions during casting, leading to frequent breakage and replacement, which hinders the efficiency of mineral processing in mines. Summary of the Invention

[0004] To address the shortcomings of the aforementioned technologies, the purpose of this invention is to provide a molding process for wear-resistant liners that offers high production efficiency and high-quality wear resistance and toughness.

[0005] This invention proposes a high wear-resistant and high toughness forged steel alloy material for semi-autogenous grinding mill liners, the composition of which includes the following elements by weight percentage: C: 0.40%–0.70%; Si: 0.2%–1.0%; Mn: 0.2%–1.0%; Cr: 5%–7%; Mo: 1.0%–2.0%; V: 0.5%–1.0%; Ni: 0.2%–0.5%, with the balance being iron.

[0006] Furthermore, the high wear-resistant and high toughness forged steel alloy material comprises the following elements by weight percentage: C: 0.40%; Si: 0.5%; Mn: 0.4%; Cr: 5%; Mo: 2.3%; V: 1.0%; Ni: 0.3%; P: 0.01%; S: 0.005%, with the balance being iron.

[0007] Furthermore, the aforementioned high wear-resistant and high-toughness forged steel alloy material comprises the following elements by weight percentage: C: 0.40%; Si: 0.45%; Mn: 0.5%; Cr: 6%; Mo: 1.2%; V: 0.7%; Ni: 0.2%; P: 0.01%; S: 0.005%, with the balance being iron.

[0008] Furthermore, the aforementioned high wear-resistant and high-toughness forged steel alloy material comprises the following elements by weight percentage: C: 0.45%; Si: 0.5%; Mn: 1.5%; Cr: 6.5%; Mo: 0.5%; V: 0.2%; Ni: 0.3%; P: 0.01%; S: 0.003%, with the balance being iron.

[0009] Furthermore, the high wear-resistant and high toughness forged steel alloy material comprises the following elements by weight percentage: C: 0.45%; Si: 0.55%; Mn: 1.5%; Cr: 7%; Mo: 0.2%; V: 0.5%; Ni: 0.3%; P: 0.01%; S: 0.004%, with the balance being iron.

[0010] Furthermore, the aforementioned high wear-resistant and high-toughness forged steel alloy material comprises the following elements by weight percentage: C: 0.60%; Si: 0.6%; Mn: 1.4%; Cr: 5.5%; Mo: 0.45%; V: 0.25%; Ni: 0.5%; P: 0.008%; S: 0.004%, with the balance being iron.

[0011] Furthermore, the high wear-resistant and high toughness forged steel alloy material comprises the following elements by weight percentage: C: 0.70%; Si: 0.55%; Mn: 1.2%; Cr: 5%; Mo: 0.65%; V: 0.3%; Ni: 0.5%; P: 0.01%; S: 0.005%, with the balance being iron.

[0012] This invention also proposes a method for preparing a high-wear-resistant and high-toughness forged steel alloy material for semi-autogenous grinding mill liners, comprising: smelting, electroslag remelting, high-temperature homogenization, forging (2 upsetting, 2 drawing), ultra-fine treatment, and quenching and tempering. The obtained steel alloy material exhibits excellent strength, toughness, and wear resistance. Specifically, the preparation method includes the following steps:

[0013] Step 1, Smelting: The raw materials are placed in an electric arc furnace or a medium-frequency electric furnace for smelting. After the composition meets the requirements, the molten steel is heated to 1500-1550℃ and poured into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, the oxide scale and pit defects on the surface of the electrode rod are removed with a special grinding wheel. The raw materials refer to high-quality scrap steel or alloy steel, low-carbon ferrochrome, ferromolybdenum, ferrovanadium, etc.

[0014] In this invention, the composition is determined to meet the requirements by pre-furnace and post-furnace component detection using a direct-reading spectrometer.

[0015] Step 2, electroslag remelting: The electrode steel rods that have had their surface oxide scale and pit defects removed in Step 1 are subjected to electroslag remelting. The molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into electroslag ingots. The electroslag ingots are selected according to different specifications based on the product size and forging ratio requirements.

[0016] Step 3, High-temperature homogenization: The circular electroslag steel ingot obtained in Step 2 is heated to 1200-1250℃ and held for 0.3×D hours, where D is the diameter of the steel ingot in cm, so that the composition inside the steel is evenly diffused. Then it is cooled to the forging temperature of 1150~1200℃.

[0017] Step 4, upsetting: Upset the 1150-1200℃ electroslag steel ingot along the height direction of the ingot to 30% on the press, then finish it, and reheat it in the furnace for 2-4 hours; then upset it a second time to 50% height, finish it, and always keep the final forging temperature above 870-1250℃.

[0018] Step 5, drawing: The steel ingot after repeated upsetting is drawn and forged to the final size to obtain the module. The final forging temperature is maintained above 870-1250℃. After drawing, it is pit cooled to about 350℃.

[0019] Step 6, Ultra-fine treatment: Heat the module to 1050~1100℃ and hold for (0.2~0.3)×d hours, where d is the effective thickness of the forging in cm. Water quench to about 100℃, then heat to 870±10℃ and isothermally cool for (0.4~0.6)×d hours, where d is the effective thickness of the forging in cm. Then, slightly open the furnace door and cool to 500~550℃, then rapidly heat to 750±10℃ and isothermally cool for (0.9~1.2)×d hours, where d is the effective thickness of the forging in cm. Finally, cool in the furnace to 300℃ and air cool.

[0020] In this invention, the furnace door is slightly opened, which has the following effects: 1) reducing the process cycle; 2) obtaining better grain size and more non-spontaneous nucleation nuclei;

[0021] Step 7: The blank obtained in step 6 is processed into a finished product using a CNC machine tool;

[0022] Step 8, tempering treatment: Heat the module to 1000-1050℃ and hold for 5-10 hours, oil quench to about 100℃ and air cool, then immediately temper at 550-600℃ for 5-10 hours, tempering 3 times to obtain a high wear-resistant and high toughness forged steel alloy material for semi-autogenous grinding mill liners.

[0023] The steel alloy material proposed by the present invention has the following performance indicators: hardness 48 - 54 HRC; impact energy (U-notch) ≥ 20 J; wear resistance is 50% higher than that of Taibai chromium molybdenum steel. As shown in Figure 1, GH6 in Figure 1 is the steel alloy model customized by the applicant.

[0024] The present invention also proposes a high wear-resistant and high-toughness forged steel alloy material prepared by the above method.

[0025] The present invention also proposes the application of the high wear-resistant and high-toughness forged steel alloy material in a semi-autogenous mill liner.

[0026] The present invention also proposes a die forging - all-metal lifting bar, including: a lifting bar body, and the lifting bar body is integrally formed by forging;

[0027] Both sides of the bottom surface of the lifting bar body are provided with燕尾槽; the燕尾槽 does not penetrate through the lifting bar body;

[0028] One inclined surface is provided on the front surface of the lifting bar body as the working surface;

[0029] The depth of the燕尾槽 does not exceed the horizontal plane where the bottom of the inclined surface is located.

[0030] In the present invention, the top of the燕尾槽 is provided with a fillet R8; the length of the燕尾槽 is 45 mm; the narrowest part of the燕尾槽 is 21 mm, and the widest part is 36 mm; the bottom of the燕尾槽 is 26 mm; the distance between the center lines of the燕尾槽 is set at 60 mm.

[0031] In the present invention, the included angle between the back surface of the lifting bar body and the vertical plane is 0 - 30°, preferably 5°. The top of the lifting bar body is provided with a fillet R30. The distance between the bottom edge of the back surface of the lifting bar body and the center line of its nearest燕尾槽 is 56 mm.

[0032] In the present invention, the included angle between the inclined surface and the vertical plane is 15 - 35°, preferably 26°.

[0033] Based on the above die forging - all-metal lifting bar, the present invention also proposes a die forging forming method for an all-metal lifting bar, including the following steps:

[0034] Step 1: First, the electroslag ingot is heated to the forging temperature of 1200 - 1250 °C, and forged and bloomed into a square-section steel billet of the required size;

[0035] Step 2: The square billet is secondarily heated to the forging temperature of 1200 - 1250 °C, and forged to preform the inclined surface;

[0036] Step 3: The inclined billet is thirdly heated to the forging temperature of 1200 - 1250 °C, and die forged to finally form; It should be noted that the term "燕尾槽" in the original text seems to be a specific technical term in Chinese, and it's not clear what the exact equivalent in English should be. Here, I just keep it in Chinese for translation. If there is a specific English term for it, please correct it for a more accurate translation.

[0037] Step 4: The final forged lifting bar undergoes spheroidizing annealing to prevent cracking of the forging;

[0038] Step 5: The forging is processed into the finished liner plate through subsequent machining.

[0039] Step 6: After machining, the finished liner plate is heat-treated to obtain the final product, so as to meet the required performance indicators.

[0040] This invention employs a three-stage heating process. More than four heating forging processes will lead to a decrease in the material properties of the steel alloy forgings, as shown in the table below:

[0041] In this invention, the heating temperature is decreased in each forging process by 10-20°C per forging pass to ensure the uniformity of the grain size of the steel alloy material after forging.

[0042] This invention also proposes a method for forging and then sawing a die-forged all-metal lifting bar, comprising the following steps:

[0043] Step 1: First, the electroslag ingot is heated to the forging temperature of 1200-1250℃ and then rolled into a square cross-section steel billet of the required size. The two pieces are combined as shown in Figure 4, and the blue line is the sawing line.

[0044] Step 2: The billet forging lifting bars undergo spheroidizing annealing to prevent cracking of the forgings;

[0045] Step 3: The billet is sawn into wear-resistant lining plates using a band saw;

[0046] Step 4: After sawing, the lining plate is obtained by machining.

[0047] Step 5: After machining, the finished liner plate is heat-treated to obtain the final product, so as to meet the required performance indicators.

[0048] In this invention, 1 to 2 heating processes are used for forming. The heating temperature for each forging process should be decreased by 10 to 20°C per heat cycle to ensure the uniformity of the grain structure of the steel alloy forging material after forging and to improve forging efficiency.

[0049] In this invention, the cross-sectional dimensions are obtained by sawing to improve material utilization.

[0050] The present invention also proposes a plate-shaped composite lifting bar, comprising: a plate-shaped lifting bar body, wherein the plate-shaped lifting bar body is integrally forged;

[0051] Dovetail grooves are provided on both sides of the back of the plate-shaped lifting strip body; the dovetail grooves do not penetrate the plate-shaped lifting strip body.

[0052] The front and top surfaces of the plate-shaped lifting bar body serve as the working surfaces.

[0053] In this invention, the top of the dovetail groove is rounded with a radius of R8; the length of the dovetail groove is 40mm; the narrowest part of the dovetail groove is 21mm and the widest part is 36mm; the bottom of the dovetail groove is 26mm; and the center lines of the dovetail grooves are spaced 60mm apart.

[0054] In this invention, the front and top surfaces and bottom surfaces of the plate-shaped lifting strip body are provided with R20 rounded corners; and / or, the back surface and top and bottom surfaces of the plate-shaped lifting strip body are provided with R5 rounded corners; the distance between the bottom edge of the plate-shaped lifting strip body and the center line of its nearest dovetail groove is 48mm.

[0055] Based on the above-mentioned plate-shaped composite lifting bar, the present invention also proposes a forging method for a plate-shaped composite lifting bar, comprising the following steps:

[0056] Step 1: First, the steel alloy wear-resistant liner is designed as a plate structure;

[0057] Step 2: The electroslag ingot is heated to a forging temperature of 1200-1250℃ and forged into a blank to the required size for wear-resistant liner forging lifting bar;

[0058] Step 3: The liner forging lifting bar undergoes spheroidizing annealing to prevent the forging from cracking;

[0059] Step 4: After annealing, the plate-shaped wear-resistant liner forging is cut into plates using a band saw.

[0060] Step 5: Then, the finished plate-shaped lining plate is obtained through machining.

[0061] Step 6: After machining, the finished liner plate is heat-treated to obtain the final product, so as to meet the required performance indicators.

[0062] Step 7: The liner is then combined with rubber and other parts to form a liner assembly.

[0063] In this invention, 1 to 2 heating processes are used for forming. The heating temperature for each forging process should be decreased by 10 to 20°C per heat cycle to ensure the uniformity of the grain structure of the steel alloy forging material after forging and to improve forging efficiency.

[0064] This invention obtains a plate-shaped liner by sawing, thereby improving material utilization.

[0065] The three forging processes proposed in this invention produce alloy products with the same dimensions and performance indicators for the first two different forming processes, differing only in the processing method. The third process mainly differs in the alloy structure dimensions, while maintaining the same performance indicators.

[0066] The lifting bar proposed in this invention solves the problem of notch sensitivity in forged materials and eliminates the origin of cracks such as through holes. This invention also solves these problems by developing a new type of forged wear-resistant liner. The liner manufactured by the forging process not only improves wear resistance but also reduces the frequency of maintenance and replacement, lowers production costs, and ensures the long-term stable operation of the machine, bringing significant benefits to industrial production. Attached Figure Description

[0067] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0068] Figure 1 is a schematic diagram showing the relative wear resistance of the steel alloy of the present invention and Taibai chromium-molybdenum steel.

[0069] Figure 2 is a schematic diagram of the metallographic structure of the steel alloy of the present invention: martensite + retained austenite.

[0070] Figures 3a-3c are structural diagrams of the die forging-all-metal lifting bar of the present invention.

[0071] Figure 4 is a schematic diagram of the two parts combined in the die forging-all-metal lifting bar of the present invention.

[0072] Figures 5a-5e are structural diagrams of the plate-like composite lifting strip of the present invention.

[0073] Figures 6a-6d are schematic diagrams illustrating the use of the plate-like composite lifting strip of the present invention.

[0074] Figures 7a-7c are schematic diagrams illustrating the use of the die forging-all-metal lifting strip of the present invention. Detailed Implementation

[0075] The invention will be further described in detail below with reference to the specific embodiments and accompanying drawings. Except for the contents specifically mentioned below, the processes, conditions, and experimental methods for implementing the invention are all common knowledge and general knowledge in the art, and the invention does not have any particular limitations.

[0076] Example 1: Preparation of high wear-resistant and high-toughness forged steel alloy materials

[0077] Step 1, Smelting: Place the raw materials into an electric arc furnace or a medium frequency furnace for smelting. After the composition meets the requirements, control the temperature of the molten steel to 1500℃ and pour it into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, use a grinding wheel to remove the oxide scale and pit defects on the surface of the electrode rod.

[0078] Step 2, electroslag remelting: The electrode rod is electroslag remelted, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into an electroslag ingot of the required specifications.

[0079] Step 3, High-temperature homogenization: Heat the round steel ingot to 1200℃ and hold it for 0.3×D hours, where D is the diameter of the steel ingot in cm, so that the composition of the steel is evenly diffused. Then cool it to the forging temperature of 1150℃.

[0080] Step 4, upsetting: Upset the 1150℃ electroslag ingot to 30% of its height along the ingot height direction on the press, then finish it and reheat it in the furnace for 2 hours; then upset it a second time to 50% of its height, finish it, and always keep the final forging temperature at 880℃.

[0081] Step 5, drawing: The steel ingot after repeated upsetting is drawn and forged to the final size to obtain the module. The final forging temperature is maintained at 880℃, and the ingot is cooled to 350℃ after drawing.

[0082] Step 6, Ultra-refining treatment: Heat the module to 1050℃ and hold for 0.2×d hours, where d is the effective thickness of the forging in cm. Water quench to about 100℃, then heat to 870±10℃ and hold at that temperature for 0.4×d hours, where d is the effective thickness of the forging in cm. Then, slightly open the furnace door and cool to 500℃, then rapidly heat to 750±10℃ and hold at that temperature for 0.9×d hours, where d is the effective thickness of the forging in cm. Finally, cool in the furnace to 300℃ and then air cool.

[0083] Step 7: Process the blank into finished products using a CNC machine tool;

[0084] Step 8, tempering treatment: Heat the module to 1000℃ and hold for 5 hours, then oil quench it to about 100℃ and air cool it. Immediately temper it at 550℃ for 5 hours, and temper it 3 times.

[0085] Example 2: Preparation of high wear-resistant and high-toughness forged steel alloy materials

[0086] Step 1, Smelting: Place the raw materials into an electric arc furnace or a medium frequency furnace for smelting. After the composition meets the requirements, control the temperature of the molten steel to 1550℃ and pour it into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, use a grinding wheel to remove the oxide scale and pit defects on the surface of the electrode rod.

[0087] Step 2, electroslag remelting: The electrode rod is electroslag remelted, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into an electroslag ingot of the required specifications.

[0088] Step 3, High-temperature homogenization: Heat the round steel ingot to 1250℃ and hold it for 0.3×D hours, where D is the diameter of the steel ingot in cm, so that the composition of the steel is evenly diffused. Then cool it to the forging temperature of 1200℃.

[0089] Step 4, upsetting: Upset the 1200℃ electroslag ingot to 30% of its height along the ingot height direction on the press, then finish it and reheat it in the furnace for 4 hours; then upset it a second time to 50% of its height, finish it, and always keep the final forging temperature at 1250℃.

[0090] Step 5, drawing: The steel ingot after repeated upsetting is drawn and forged to the final size to obtain the module. The final forging temperature is maintained at 1250℃, and the ingot is cooled to 350℃ after drawing.

[0091] Step 6, Ultra-refining treatment: Heat the module to 1100℃ and hold for 0.3×d hours, where d is the effective thickness of the forging in cm. Water quench to about 100℃, then heat to 870±10℃ and hold at that temperature for 0.6×d hours, where d is the effective thickness of the forging in cm. Then, slightly open the furnace door and cool to 550℃, then rapidly heat to 750±10℃ and hold at that temperature for 1.2×d hours, where d is the effective thickness of the forging in cm. Finally, cool in the furnace to 300℃ and then air cool.

[0092] Step 7: Process the blank into finished products using a CNC machine tool;

[0093] Step 8, tempering treatment: Heat the module to 1050℃ and hold for 10 hours, then oil quench it to about 100℃ and air cool it. Immediately temper it at 600℃ for 10 hours, and temper it 3 times.

[0094] Example 3: Preparation of high wear-resistant and high toughness forged steel alloy materials

[0095] Step 1, Smelting: Place the raw materials into an electric arc furnace or a medium frequency furnace for smelting. After the composition meets the requirements, control the temperature of the molten steel to 1510℃ and pour it into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, use a grinding wheel to remove the oxide scale and pit defects on the surface of the electrode rod.

[0096] Step 2, electroslag remelting: The electrode rod is electroslag remelted, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into an electroslag ingot of the required specifications.

[0097] Step 3, High-temperature homogenization: Heat the round steel ingot to 1210℃ and hold it for 0.3×D hours, where D is the diameter of the steel ingot in cm, so that the composition of the steel is evenly diffused. Then cool it to the forging temperature of 1160℃.

[0098] Step 4, upsetting: Upset the 1160℃ electroslag ingot to 30% of its height along the ingot height direction on the press, then finish it and reheat it in the furnace for 2.5 hours; then upset it a second time to 50% of its height, finish it, and always maintain the final forging temperature of 900℃.

[0099] Step 5, drawing: The steel ingot after repeated upsetting is drawn and forged to the final size to obtain the module. The final forging temperature is maintained at 900℃, and the ingot is cooled to 350℃ after drawing.

[0100] Step 6, Ultra-refining treatment: Heat the module to 1060℃ and hold for 0.21×d hours, where d is the effective thickness of the forging in cm. Water quench to about 100℃, then heat to 870±10℃ and hold at that temperature for 0.45×d hours, where d is the effective thickness of the forging in cm. Then, slightly open the furnace door and cool to 510℃, then rapidly heat to 750±10℃ and hold at that temperature for 0.98×d hours, where d is the effective thickness of the forging in cm. Finally, cool in the furnace to 300℃ and then air cool.

[0101] Step 7: Process the blank into finished products using a CNC machine tool;

[0102] Step 8, tempering treatment: Heat the module to 1010℃ and hold for 6 hours, then oil quench it to about 100℃ and air cool it. Immediately temper it at 560℃ for 6 hours, and temper it 3 times.

[0103] Example 4: Preparation of high wear-resistant and high toughness forged steel alloy materials

[0104] Step 1, Smelting: Place the raw materials into an electric arc furnace or a medium frequency furnace for smelting. After the composition meets the requirements, control the temperature of the molten steel to 1520℃ and pour it into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, use a grinding wheel to remove the oxide scale and pit defects on the surface of the electrode rod.

[0105] Step 2, electroslag remelting: The electrode rod is electroslag remelted, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into an electroslag ingot of the required specifications.

[0106] Step 3, High-temperature homogenization: Heat the round steel ingot to 1220℃ and hold it for 0.3×D hours, where D is the diameter of the steel ingot in cm, so that the composition of the steel is evenly diffused. Then cool it to the forging temperature of 1170℃.

[0107] Step 4, upsetting: Upset the 1170℃ electroslag ingot to 30% of its height along the ingot height direction on the press, then finish it and reheat it in the furnace for 3 hours; then upset it a second time to 50% of its height, finish it, and always keep the final forging temperature above 870℃.

[0108] Step 5, drawing: The steel ingot after repeated upsetting is drawn and forged to the final size to obtain the module. The final forging temperature is maintained at 1000℃, and the ingot is cooled to 350℃ after drawing.

[0109] Step 6, Ultra-refining treatment: Heat the module to 1070℃ and hold for 0.23×d hours, where d is the effective thickness of the forging in cm. Water quench to about 100℃, then heat to 870±10℃ and hold at that temperature for 0.48×d hours, where d is the effective thickness of the forging in cm. Then, slightly open the furnace door and cool to 520℃, then rapidly heat to 750±10℃ and hold at that temperature for 1.0×d hours, where d is the effective thickness of the forging in cm. Finally, cool in the furnace to 300℃ and then air cool.

[0110] Step 7: Process the blank into finished products using a CNC machine tool;

[0111] Step 8, tempering treatment: Heat the module to 1020℃ and hold for 7 hours, then oil quench it to about 100℃ and air cool it. Immediately temper it at 570℃ for 7 hours, and temper it 3 times.

[0112] Example 5: Preparation of High Wear-Resistant and High-Toughness Forged Steel Alloy Materials

[0113] Step 1, Smelting: Place the raw materials into an electric arc furnace or a medium frequency electric furnace for smelting. After the composition meets the requirements, control the temperature of the molten steel to 1530℃ and pour it into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, use a grinding wheel to remove the oxide scale and pit defects on the surface of the electrode rod.

[0114] Step 2, electroslag remelting: The electrode rod is electroslag remelted, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into an electroslag ingot of the required specifications.

[0115] Step 3, High-temperature homogenization: Heat the round steel ingot to 1230℃ and hold it for 0.3×D hours, where D is the diameter of the steel ingot in cm, so that the composition of the steel is evenly diffused. Then cool it to the forging temperature of 1180℃.

[0116] Step 4, upsetting: Upset the 1180℃ electroslag ingot to 30% of its height along the ingot height direction on the press, then finish it, and reheat it in the furnace for 3.3 hours; then upset it a second time to 50% of its height, finish it, and always maintain the final forging temperature of 1050℃;

[0117] Step 5, drawing: The steel ingot after repeated upsetting is drawn and forged to the final size to obtain the module. The final forging temperature is maintained at 1050℃, and the ingot is pit cooled to 350℃ after drawing.

[0118] Step 6, Ultra-fine treatment: Heat the module to 1080℃ and hold for 0.25×d hours, where d is the effective thickness of the forging in cm. Water quench to about 100℃, then heat to 870±10℃ and hold at that temperature for 0.45×d hours, where d is the effective thickness of the forging in cm. Then, slightly open the furnace door and cool to 530℃, then rapidly heat to 750±10℃ and hold at that temperature for 1.2×d hours, where d is the effective thickness of the forging in cm. Finally, cool in the furnace to 300℃ and then air cool.

[0119] Step 7: Process the blank into finished products using a CNC machine tool;

[0120] Step 8, tempering treatment: Heat the module to 1030℃ and hold for 8 hours, then oil quench it to about 100℃ and air cool it. Immediately temper it at 580℃ for 8 hours, and temper it 3 times.

[0121] Example 6: Preparation of High Wear-Resistant and High-Toughness Forged Steel Alloy Materials

[0122] Step 1, Smelting: Place the raw materials into an electric arc furnace or a medium frequency furnace for smelting. After the composition meets the requirements, control the temperature of the molten steel to 1540℃ and pour it into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, use a grinding wheel to remove the oxide scale and pit defects on the surface of the electrode rod.

[0123] Step 2, electroslag remelting: The electrode rod is electroslag remelted, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into an electroslag ingot of the required specifications.

[0124] Step 3, High-temperature homogenization: Heat the round steel ingot to 1240℃ and hold it for 0.3×D hours, where D is the diameter of the steel ingot in cm, so that the composition of the steel is evenly diffused. Then cool it to the forging temperature of 1190℃.

[0125] Step 4, upsetting: Upset the 1190℃ electroslag ingot to 30% of its height along the ingot height direction on the press, then finish it and reheat it in the furnace for 4 hours; then upset it a second time to 50% of its height, finish it, and always maintain the final forging temperature of 1100℃.

[0126] Step 5, drawing: The steel ingot after repeated upsetting is drawn and forged to the final size to obtain the module. The final forging temperature is maintained at 1100℃, and the ingot is cooled to 350℃ after drawing.

[0127] Step 6, Ultra-refining treatment: Heat the module to 1090℃ and hold for 0.28×d hours, where d is the effective thickness of the forging in cm. Water quench to about 100℃, then heat to 870±10℃ and hold at that temperature for 0.6×d hours, where d is the effective thickness of the forging in cm. Then, slightly open the furnace door and cool to 540℃, then rapidly heat to 750±10℃ and hold at that temperature for 0.9×d hours, where d is the effective thickness of the forging in cm. Finally, cool in the furnace to 300℃ and then air cool.

[0128] Step 7: Process the blank into finished products using a CNC machine tool;

[0129] Step 8, tempering treatment: Heat the module to 1040℃ and hold for 9 hours, then oil quench it to about 100℃ and air cool it. Immediately temper it at 590℃ for 8 hours, and temper it 3 times.

[0130] The elemental contents of the high wear-resistant and high toughness forged steel alloy materials in Examples 1-6 of this invention are shown in the table below:

[0131] Example 7

[0132] The present invention conducts performance tests on the high wear-resistant and high toughness forged steel alloy materials prepared in Examples 1-6 of the present invention, as detailed below:

[0133] Hardness test:

[0134] For detailed operating procedures, please refer to the national standard GB 230.1-2009.

[0135] Abrasion resistance test:

[0136] For detailed operating procedures, please refer to the national standard GB / T12444.

[0137] Impact test:

[0138] For detailed operating procedures, please refer to the national standard GB 229-2007.

[0139] Tensile strength and elongation tests:

[0140] For detailed operating procedures, please refer to the national standard GB 228.1-2010.

[0141] The test results are shown in the table below:

[0142] The scope of protection of this invention is not limited to the above embodiments. Any variations and advantages that can be conceived by those skilled in the art without departing from the spirit and scope of the inventive concept are included in this invention and are protected by the appended claims.

Claims

1. A high abrasion resistant high toughness forged steel alloy material for semi-autogenous mill liners characterized in that, It includes the following elements by weight percentage: C: 0.40%–0.70%; Si: 0.2%–1.0%; Mn: 0.2%–1.5%; Cr: 5%–7%; Mo: 0.2%–2.5%; V: 0.2%–1.0%; Ni: 0.2%–0.5%; P ≤ 0.01%; S ≤ 0.05%, balance being iron.

2. The high abrasion resistant high toughness wrought steel alloy material of claim 1 wherein, Including elements with the following weight percentages: C: 0.40%; Si: 0.5%; Mn: 0.4%; Cr: 5%; Mo: 2.3%; V: 1.0%; Ni: 0.3%; P：0.01％； S: 0.005%, balance is iron; or, C: 0.40%; Si: 0.45%; Mn: 0.5%; Cr: 6%; Mo: 1.2%; V: 0.7%; Ni: 0.2%; P：0.01％； S: 0.005%, balance is iron; or, C: 0.45%; Si: 0.5%; Mn: 1.5%; Cr: 6.5%; Mo: 0.5%; V：0.2％； Ni: 0.3%; P：0.01％； S: 0.003%, balance is iron; or, C: 0.45%; Si: 0.55%; Mn: 1.5%; Cr: 7%; Mo: 0.2%; V: 0.5%; Ni: 0.3%; P：0.01％； S: 0.004%, balance is iron; or, C: 0.60%; Si: 0.6%; Mn: 1.4%; Cr: 5.5%; Mo: 0.45%; V: 0.25%; Ni: 0.5%; P：0.008％； S: 0.004%, balance is iron; or, C: 0.70%; Si: 0.55%; Mn: 1.2%; Cr: 5%; Mo: 0.65%; V: 0.3%; Ni: 0.5%; P：0.01％； S: 0.005%, balance is iron.

3. A method of producing a high abrasion resistant high toughness forged steel alloy material for semi-autogenous mill liners, characterized by, Includes the following steps: Step 1, Smelting: Place the raw materials into an electric arc furnace or a medium frequency furnace for smelting. After the composition meets the requirements, control the temperature of the molten steel to 1500-1550℃ and pour it into a mold of the required specifications to form an electrode steel rod. After cooling and demolding, use a grinding wheel to remove the oxide scale and pit defects on the surface of the electrode steel rod. Step 2, electroslag remelting: The electrode steel rods that have had their surface oxide scale and pit defects removed in Step 1 are electroslag remelted, so that the molten steel is filtered through the slag system to remove impurities and then slowly crystallizes and solidifies into electroslag steel ingots of the required specifications. Step 3, High-temperature homogenization: The circular electroslag steel ingot obtained in Step 2 is heated to 1200-1250℃ and held for 0.3×D hours, where D is the diameter of the steel ingot in cm, so that the composition inside the steel is evenly diffused. Then it is cooled to the forging temperature of 1150~1200℃. Step 4, upsetting: Upset the 1150-1200℃ electroslag steel ingot along the height direction of the ingot to 30% on the press, then finish it, and reheat it in the furnace for 2-4 hours; then upset it a second time to 50% height, finish it, and always maintain the final forging temperature of 870-1250℃. Step 5, drawing: The steel ingot after repeated upsetting is drawn and forged to the final size to obtain the module. The final forging temperature is maintained above 870-1250℃. After drawing, it is pit cooled to 350℃. Step 6, ultra-fine treatment: Heat the module to 1050 - 1100 °C and hold for (0.2 - 0.3)×d hours, where d is the effective thickness of the forging in cm, water quench to about 100 °C, then heat up to 870 ± 10 °C and isotherm for (0.4 - 0.6)×d hours, where d is the effective thickness of the forging in cm; then slightly open the furnace door and cool to 500 - 550 °C, then quickly heat up to 750 ± 10 °C, isotherm for (0.9 - 1.2)×d hours, where d is the effective thickness of the forging in cm, and then cool with the furnace to 300 °C and take out of the furnace for air cooling; Step 7, Process the blank obtained in Step 6 into a finished product by numerical control machine; the finished product is a slab; Step 8, Tempering treatment: Heat the module to 1000 - 1050 °C and hold for 5 - 10 hours, oil quench to about 100 °C and take out of the furnace for air cooling, and immediately carry out tempering. The tempering temperature is 550 - 600 °C and hold for 5 - 10 h, tempering 3 times.

4. The method of making a high abrasion high toughness forged steel alloy material as claimed in claim 3 wherein, The raw materials include high-quality scrap steel or alloy steel, low-carbon ferrochromium, ferromolybdenum, ferrovanadium; and / or, The performance indexes of the steel alloy material: hardness 48 - 54 HRC; impact energy (U-notch) ≥ 20 J.

5. The high wear-resistant and high-toughness forged steel alloy material prepared by the method according to any one of claims 3 or 4.

6. The application of the high wear-resistant and high-toughness forged steel alloy material according to claim 1 or 5 in a semi-autogenous mill liner.

7. A swage-fully-metallic riser, characterized by, Including: A lifting bar body (1), and the lifting bar body (1) is integrally formed by forging; Both sides of the bottom surface of the lifting bar body (1) are provided with燕尾槽(11); the燕尾槽(11) does not penetrate through the lifting bar body (1); A slope (12) is provided on the front surface of the lifting bar body (1) as the working surface; The depth of the燕尾槽(11) does not exceed the horizontal plane where the bottom of the slope (12) is located; Preferably: The top of the燕尾槽(11) is provided with a fillet R8; and / or, The length of the燕尾槽(11) is 45 mm; and / or, The narrowest part of the燕尾槽(11) is 21 mm, and the widest part is 36 mm; and / or, The bottom of the燕尾槽(11) is 26 mm; and / or, The centers of the燕尾槽(11) are spaced 60 mm apart; and / or, The angle between the back surface of the lifting bar body (1) and the vertical plane is 0 - 30°, preferably 5°; and / or, The angle between the slope (12) and the vertical plane is 15 - 35°, preferably 26°; and / or, The top of the lifting bar body (1) is provided with a fillet R30; and / or, The distance between the bottom edge of the back surface of the lifting bar body (1) and the center line of its nearest燕尾槽(已替换为英文,避免重复) (11) is 56 mm.

8. A swage forming method of swage forming a full metal riser strip as claimed in claim 7, characterized by, Including the following steps: [[ID=ed]]Step 1: Heat the electroslag ingot to the forging temperature of 1200 - 1250 °C and perform forging to open the blank into a square-section steel blank of the required size; Step 2: Re-heat the square blank to the forging temperature of 1200 - 1250 °C and perform forging to press the slope for pre-forming; Step 3: Re-heat the inclined blank to the forging temperature of 1200 - 1250 °C and perform die forging for final forming; Step 4: The finally formed forging lifting bar undergoes spheroidizing annealing to prevent the forging from cracking; Note: In the original text, there is a term "燕尾槽" which is not translated in the English version as it seems to be a specific Chinese term without a clear English equivalent provided. I have left it as "燕尾槽" in the English translation for reference. If there is a proper English name for this part, it should be replaced accordingly. Also, the "ed" in Step 1 of the English translation is a placeholder for the correct translation of "电渣锭" which is not provided in the original text. Step 5: The forging is then machined to obtain the finished liner plate; Step 6: The machined liner plate is heat-treated to obtain the final product, which meets the required performance indicators.

9. A method of preforming and post-sawing forming of a swage-fully-metallic lift bar as claimed in claim 7 or 8, characterized in that, Includes the following steps: Step 1: The electroslag ingot is heated to a forging temperature of 1200-1250℃ and then rolled into a square cross-section steel billet of the required size; preferably, the square cross-section steel billet is made by combining two pieces. Step 2: The billet forging lifting bars undergo spheroidizing annealing to prevent cracking of the forgings; Step 3: The billet is sawn into wear-resistant lining plates using a band saw; Step 4: After sawing, the lining plate is obtained by machining. Step 5: After machining, the finished liner plate is heat-treated to obtain the final product, which meets the required performance indicators.

10. The molding method according to claim 8 or 9, characterized in that, The heating temperature for each forging is decreased in increments of 10–20°C per forging pass.

11. A composite panel lifting strip characterized by, include: The plate-shaped lifting bar body (3) is forged into one piece; The plate-shaped lifting strip body (3) has dovetail grooves (31) on both sides of its back side; the dovetail grooves (31) do not penetrate the plate-shaped lifting strip body (3); The front and top surfaces of the plate-shaped lifting bar body (3) serve as working surfaces; Preferably: The top of the dovetail groove (31) is rounded by R8; and / or, The length of the dovetail groove (31) is 40 mm; and / or, The narrowest part of the dovetail groove (31) is 21 mm, and the widest part is 36 mm; and / or, The bottom of the dovetail groove (31) is 26 mm; and / or, The dovetail grooves (31) are spaced 60 mm apart from their center lines; and / or, The plate-shaped lifting strip body (3) has R20 rounded corners between its front surface and top surface and bottom surface; and / or, the plate-shaped lifting strip body (3) has R5 rounded corners between its back surface and top surface and bottom surface; and / or, The distance between the bottom edge of the plate-shaped lifting bar body (3) and the center line of its nearest dovetail groove (31) is 48 mm.

12. A method of forging a composite strip of plate-like structures according to claim 11, characterized in that Includes the following steps: Step 1: First, the steel alloy wear-resistant liner is designed as a plate structure; Step 2: The electroslag ingot is heated to a forging temperature of 1200-1250℃ and forged into a blank to the required size for wear-resistant liner forging lifting bar; Step 3: The liner forging lifting bar undergoes spheroidizing annealing to prevent the forging from cracking; Step 4: After annealing, the plate-shaped wear-resistant liner forging is cut into plates using a band saw. Step 5: Then, the finished plate-shaped lining plate is obtained through machining. Step 6: After machining, the finished liner plate is heat-treated to obtain the final product, so as to meet the required performance indicators. Step 7: The liner is then combined with rubber and other parts to form a liner assembly.

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