Composite lifter bar having plate-shaped structure

Abstract

A composite lifter bar having a plate-shaped structure, comprising: a plate-shaped lifter bar body (3), the plate-shaped lifter bar body (3) being integrally formed by forging; and dovetail grooves (31), provided on both sides of the back surface of the plate-shaped lifter bar body (3). The dovetail grooves (31) do not penetrate through the plate-shaped lifter bar body (3). The front surface and the top surface of the plate-shaped lifter bar body (3) serve as working surfaces. By means manufacturing a liner plate using forging, wear resistance can be improved and the frequency of maintenance and replacement can be reduced, production costs can be reduced, and a long-term stable working state of a machine can be ensured, thereby bringing significant benefits to industrial production.

Description

A plate-shaped composite lifting bar Technical Field

[0001] This utility model belongs to the technical field of steel lifting bars, and relates to a plate-shaped composite lifting bar. 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.

[0004] Utility Model Content

[0005] To address the shortcomings of the aforementioned technologies, the purpose of this utility model is to provide a wear-resistant liner with high production efficiency, high quality wear resistance, and high toughness, as well as a lifting strip and its forming method.

[0006] This utility model proposes a plate-shaped composite lifting bar, comprising: a plate-shaped lifting bar body, wherein the plate-shaped lifting bar body is integrally forged;

[0007] 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.

[0008] The front and top surfaces of the plate-shaped lifting bar body serve as the working surfaces.

[0009] In this utility model, 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.

[0010] In this utility model, 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.

[0011] Based on the above-mentioned plate-shaped composite lifting bar, this utility model also proposes a forging method for a plate-shaped composite lifting bar, including the following steps:

[0012] Step 1: First, the steel alloy wear-resistant liner is designed as a plate structure;

[0013] 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;

[0014] Step 3: The liner forging lifting bar undergoes spheroidizing annealing to prevent the forging from cracking;

[0015] Step 4: After annealing, the plate-shaped wear-resistant liner forging is cut into plates using a band saw.

[0016] Step 5: Then, the finished plate-shaped lining plate is obtained through machining.

[0017] Step 6: After machining, the finished liner plate is heat-treated to obtain the final product, so as to meet the required performance indicators.

[0018] Step 7: The liner is then combined with rubber and other parts to form a liner assembly.

[0019] In this invention, one to two heating processes are used for forming. The heating temperature for each forging process should be decreased by 10 to 20°C per forging process to ensure the uniformity of the grain structure of the steel alloy forging material after forging and to improve forging efficiency.

[0020] This invention improves material utilization by sawing to obtain a plate-shaped liner.

[0021] This utility model also proposes a die-forged all-metal lifting bar, including: a lifting bar body, wherein the lifting bar body is forged into one piece;

[0022] Dovetail grooves are provided on both sides of the bottom surface of the lifting bar body; the dovetail grooves do not penetrate the lifting bar body.

[0023] The lifting bar body has a sloping surface on its front side, which serves as a working surface;

[0024] The depth of the dovetail groove does not exceed the horizontal plane where the bottom of the inclined plane is located.

[0025] In this utility model, the top of the dovetail groove is rounded with a radius of R8; the length of the dovetail groove is 45mm; 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.

[0026] In this invention, the 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 rounded with a radius of R30. The distance between the bottom edge of the back surface of the lifting bar body and the center line of its nearest dovetail groove is 56mm.

[0027] In this invention, the angle between the inclined plane and the vertical plane is 15-35°, preferably 26°.

[0028] Based on the above die forging-all-metal lifting bar, this utility model also proposes a die forging method for an all-metal lifting bar, including the following steps:

[0029] Step 1: First, the electroslag ingot is heated to a forging temperature of 1200-1250℃ and forged into a square cross-section steel billet of the required size.

[0030] Step 2: The billet is heated a second time to a forging temperature of 1200-1250℃ and then pre-formed by forging and pressing the inclined surface.

[0031] Step 3: The slanted billet is heated three times to a forging temperature of 1200-1250℃ and then forged in a die for final shaping.

[0032] Step 4: The final forged lifting bar undergoes spheroidizing annealing to prevent cracking of the forging;

[0033] Step 5: The forging is processed into the finished liner plate through subsequent machining.

[0034] Step 6: After machining, the finished liner plate is heat-treated to obtain the final product, so as to meet the required performance indicators.

[0035] 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:

[0036] In this invention, the heating temperature is decreased in each forging process, decreasing by 10-20°C per forging pass, to ensure the uniformity of the grain size of the steel alloy material after forging.

[0037] This utility model also proposes a method for forging and then sawing a die-forged all-metal lifting bar, including the following steps:

[0038] 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.

[0039] Step 2: The billet forging lifting bars undergo spheroidizing annealing to prevent cracking of the forgings;

[0040] Step 3: The billet is sawn into wear-resistant lining plates using a band saw;

[0041] Step 4: After sawing, the lining plate is obtained by machining.

[0042] Step 5: After machining, the finished liner plate is heat-treated to obtain the final product, so as to meet the required performance indicators.

[0043] In this invention, one to two heating processes are used for forming. The heating temperature for each forging process should be decreased by 10 to 20°C per forging process to ensure the uniformity of the grain structure of the steel alloy forging material after forging and to improve forging efficiency.

[0044] In this invention, the cross-sectional dimensions are obtained by sawing to improve material utilization.

[0045] This utility model also 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] This utility model 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:

[0053] 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.

[0054] In this invention, the composition is determined to meet the requirements by using a direct-reading spectrometer for pre-furnace and post-furnace composition detection.

[0055] 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.

[0056] Step 3, high-temperature homogenization: Heat the circular electroslag ingot obtained in Step 2 to 1200 - 1250 °C, with a holding time of 0.3×D hours, where D is the diameter size of the ingot in cm, to make the composition in the steel diffuse uniformly, and then cool it to the forging temperature of 1150 - 1200 °C;

[0057] Step 4, upsetting: Upset the electroslag ingot at 1150 - 1200 °C on the press along the height direction of the ingot to 30% of its height, then finish sizing, and heat it in the furnace for 2 - 4 hours; then perform the second upsetting to 50% of its height, finish sizing, and always maintain the final forging temperature above 870 - 1250 °C;

[0058] Step 5, drawing out: Draw out and forge the ingot after double upsetting to obtain the module with the final size, maintain the final forging temperature above 870 - 1250 °C, and cool it in the pit to about 350 °C after drawing out;

[0059] Step 6, ultra-fine grain 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 it to about 100 °C, then raise the temperature 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 it in the furnace to 500 - 550 °C, then quickly raise the temperature 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 it in the furnace to 300 °C and take it out for air cooling;

[0060] In the present utility model, slightly opening the furnace door has the following functions: 1) Reduce the process cycle; 2) Obtain better grain size and more non-spontaneous nucleation cores;

[0061] Step 7, Process the blank obtained in Step 6 into a finished product by numerically controlled machine tools;

[0062] Step 8, quenching and tempering treatment: Heat the module to 1000 - 1050 °C and hold for 5 - 10 hours, oil quench it to about 100 °C and take it out for air cooling, and immediately perform tempering. The tempering temperature is 550 - 600 °C and hold for 5 - 10h, temper 3 times to obtain a high wear-resistant and high toughness forged steel alloy material for the semi-autogenous mill liner.

[0063] For the steel alloy material proposed by the present utility model, the performance indicators are: hardness 48 - 54 HRC; impact energy (U-notch) ≥ 20 J; the wear resistance is 50% higher than that of Taibai chromium molybdenum steel. As shown in Figure 1, GH6 in Figure 1 is the custom steel alloy model of the applicant.

[0064] The present utility model also proposes a high wear-resistant and high toughness forged steel alloy material prepared by the above method.

[0065] This invention also proposes the application of the aforementioned high wear-resistant and high toughness forged steel alloy material in the liner of a semi-autogenous grinding mill.

[0066] The three forging processes proposed in this utility model yield 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.

[0067] The lifting bar proposed in this utility model solves the problem of notch sensitivity in forged materials and eliminates the origin of cracks such as through holes. This utility model 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 working condition of the machine, bringing significant benefits to industrial production. Attached Figure Description

[0068] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0069] Figure 1 is a schematic diagram showing the relative wear resistance of the steel alloy of this utility model and Taibai chromium-molybdenum steel.

[0070] Figure 2 is a schematic diagram of the metallographic structure of the steel alloy of this utility model: martensite + retained austenite.

[0071] Figures 3a-3c are structural diagrams of the die forging-all-metal lifting bar of this utility model.

[0072] Figure 4 is a schematic diagram of the two parts combined in the die forging-all-metal lifting bar of this utility model.

[0073] Figures 5a-5e are structural diagrams of the plate-shaped composite lifting strip of this utility model.

[0074] Figures 6a-6d are schematic diagrams illustrating the use of the plate-shaped composite lifting strip of this utility model.

[0075] Figures 7a-7d are schematic diagrams illustrating the use of the all-metal lifting bar in the die forging of this utility model. Detailed Implementation

[0076] The utility model 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 this utility model are all common knowledge and general knowledge in the field, and this utility model has no particular limitations.

[0077] Example 1: Preparation of high wear-resistant and high-toughness forged steel alloy materials

[0078] 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.

[0079] 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.

[0080] 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℃.

[0081] 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℃.

[0082] 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.

[0083] 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.

[0084] Step 7: Process the blank into finished products using a CNC machine tool;

[0085] 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.

[0086] Example 2: Preparation of high wear-resistant and high-toughness forged steel alloy materials

[0087] 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.

[0088] 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.

[0089] 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℃.

[0090] 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℃.

[0091] 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.

[0092] 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.

[0093] Step 7: Process the blank into finished products using a CNC machine tool;

[0094] 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.

[0095] Example 3: Preparation of high wear-resistant and high toughness forged steel alloy materials

[0096] 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.

[0097] 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.

[0098] 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℃.

[0099] 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℃.

[0100] 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.

[0101] 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.

[0102] Step 7: Process the blank into finished products using a CNC machine tool;

[0103] 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.

[0104] Example 4: Preparation of high wear-resistant and high toughness forged steel alloy materials

[0105] 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.

[0106] 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.

[0107] 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℃.

[0108] 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℃.

[0109] 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.

[0110] 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.

[0111] Step 7: Process the blank into finished products using a CNC machine tool;

[0112] 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.

[0113] Example 5: Preparation of High Wear-Resistant and High-Toughness Forged Steel Alloy Materials

[0114] 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.

[0115] 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.

[0116] 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℃.

[0117] 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℃;

[0118] 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.

[0119] 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.

[0120] Step 7: Process the blank into finished products using a CNC machine tool;

[0121] 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.

[0122] Example 6: Preparation of High Wear-Resistant and High-Toughness Forged Steel Alloy Materials

[0123] 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.

[0124] 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.

[0125] 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℃.

[0126] 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℃.

[0127] 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.

[0128] 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.

[0129] Step 7: Process the blank into finished products using a CNC machine tool;

[0130] 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.

[0131] The elemental contents of the high wear-resistant and high-toughness forged steel alloy materials in Embodiments 1-6 of this utility model are shown in the following table:

[0132] Example 7

[0133] 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:

[0134] Hardness test:

[0135] For detailed operating procedures, please refer to the national standard GB 230.1-2009.

[0136] Abrasion resistance test:

[0137] For detailed operating procedures, please refer to the national standard GB / T12444.

[0138] Impact test:

[0139] For detailed operating procedures, please refer to the national standard GB 229-2007.

[0140] Tensile strength and elongation tests:

[0141] For detailed operating procedures, please refer to the national standard GB 228.1-2010.

[0142] The test results are shown in the table below:

[0143] The scope of protection of this utility model 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 utility model are included in this utility model and are protected by the appended claims.

Claims

1. A plate-shaped composite lifting strip, characterized in that, 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 the working surfaces.

2. The plate-shaped composite lifting strip as described in claim 1, characterized in that, The top of the dovetail groove (31) is rounded with a radius of R8.

3. The plate-shaped composite lifting strip as described in claim 1, characterized in that, The length of the dovetail groove (31) is 40 mm.

4. The plate-shaped composite lifting strip as described in claim 1, characterized in that, The narrowest part of the dovetail groove (31) is 21 mm, and the widest part is 36 mm.

5. The plate-shaped composite lifting strip as described in claim 1, characterized in that, The bottom of the dovetail groove (31) is 26mm.

6. The plate-shaped composite lifting strip as described in claim 1, characterized in that, The dovetail grooves (31) are spaced 60 mm apart from each other.

7. The plate-shaped composite lifting strip as described in claim 1, characterized in that, The plate-shaped lifting strip body (3) has R20 rounded corners between its front side and top and bottom surfaces; and / or, the plate-shaped lifting strip body (3) has R5 rounded corners between its back side and top and bottom surfaces.

8. The plate-shaped composite lifting strip as described in claim 1, characterized in that, 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.

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