A carbon steel composite plate for a cutting tool and a manufacturing process thereof

Abstract

The application discloses a carbon steel composite plate for cutters and a preparation process thereof, and belongs to the technical field of metal composite materials. The core of the composite plate is carbon steel or carbon steel powder, the outer layer is corrosion-resistant stainless steel, and there is a separation layer between the carbon steel and the stainless steel. The outermost layer is provided with a sheath. In the application, the carbon steel-stainless steel composite steel plate for cutters retains the advantages of high hardness, wear resistance and good regrindability of carbon steel, and solves the problem of easy rusting of the material surface. Meanwhile, the amount of stainless steel is reduced, and the material cost is lowered.

Description

Technical Field

[0001] This invention belongs to the field of metal composite materials technology, specifically a carbon steel composite plate for cutting tools and its preparation process. Background Technology

[0002] Carbon steel kitchen knives are a traditional type of Chinese kitchen knife. Due to their durability, sharpness, and ease of sharpening, they still have a large market in China. As people pursue a higher quality of life and place increasing emphasis on healthy eating, higher performance requirements are being placed on carbon steel kitchen knives.

[0003] In modern manufacturing, the performance of cutting tool materials directly affects the tool's lifespan and processing efficiency. Traditional cutting tool materials are mostly single-metal materials, such as high-speed steel and cemented carbide. Although these materials possess a certain degree of hardness and wear resistance, they still suffer from problems such as easy wear and poor corrosion resistance in complex processing environments. Especially when processing corrosive materials, the tool's durability is greatly reduced, affecting processing efficiency and quality. Traditional carbon steel kitchen knives suffer from poor corrosion resistance and are prone to rusting, while stainless steel kitchen knives are more expensive than carbon steel knives, and their resharpening is not as good. Therefore, it is necessary to propose a carbon steel composite plate for cutting tools and its manufacturing process to solve the above technical problems. Summary of the Invention

[0004] To address the above problems, this invention provides a carbon steel composite plate for cutting tools and its preparation process, which solves the technical problems of poor hardness, wear resistance, re-grinding ability, and rust in existing cutting tools.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A carbon steel composite plate for cutting tools, wherein the core of the composite plate is carbon steel or carbon steel powder and the outer layer is corrosion-resistant stainless steel, with a separating layer between the carbon steel and the stainless steel; initially, a sheath is provided on the outermost layer, which is then oxidized.

[0007] A manufacturing process for a carbon steel composite plate for cutting tools specifically includes the following steps:

[0008] Step 1: Cleaning the surface of raw material boards: Use physical and chemical methods to remove oil, oxides and impurities from the surface of the raw material boards;

[0009] Step 2: Encasing preparation and blank assembly:

[0010] Sheath preparation: The sheath is made of steel plate welded into a box shape, and the five sides of the sheath are welded together by gas shielded welding, with the upper end face reserved for filling raw materials;

[0011] Blank assembly: After cleaning the surface of the sheet material, put it into a clean packaging box in sequence. The top and bottom layers are stainless steel plates, and carbon steel plates or carbon steel powder are stacked in the middle. A partition layer is placed between the carbon steel and the stainless steel. Finally, cover the box with the packaging cover plate.

[0012] Step 3, Vacuum Packaging: The assembled composite blank is fed into the vacuum packaging equipment, the air in the packaging box is removed by vacuuming, and then the packaging is sealed and welded.

[0013] Step 4, hot rolling: Heat the above-mentioned clad composite steel billet to 950-1050℃, hold it at that temperature for 1-3 hours, and then hot roll it. The initial rolling temperature is about 950-1000℃, the final rolling temperature is greater than 730℃, and the total hot rolling reduction is greater than 90%.

[0014] Step 5, Heat treatment: Annealing: Place the carbon steel composite steel plate in a gas-protected furnace and heat it to 700-800℃ and hold it for 2-4 hours for annealing. Then, cool it in the furnace to 580-650℃ and then remove it from the furnace and air cool it.

[0015] Step 6, Finishing and Slitting: Straighten the annealed carbon steel composite steel plate, cut (sawing) the ends and edges, and slit it to the appropriate size;

[0016] Step 7, Heat Treatment: Quenching: Heat the carbon steel composite steel plate to 780-880℃ for quenching, hold for 10-60 minutes, and then remove from the furnace and cool with oil or water mist.

[0017] Cryogenic treatment: After cooling to room temperature, the steel billet is transferred into a cryogenic furnace and cryogenically cooled at -150 to 80°C for 30 minutes to 2 hours.

[0018] Tempering: After deep cooling, the composite board is heated to 120-200℃ and held for 2-5 hours for tempering treatment.

[0019] As a further improvement to the above scheme, the cladding is made of 3Cr13 stainless steel plate.

[0020] As a further improvement to the above scheme, the outer layer of stainless steel in the composite plate can be stainless steel of the same material or stainless steel composed of multiple layers of stainless steel of different materials.

[0021] As a further improvement to the above scheme, the composite steel plate can be 5, 7 or more layers, the core carbon steel is T8 or T10 carbon tool steel, the separator can be copper, white copper, or copper-containing nickel plate, and the outer stainless steel is 2Cr13, 3Cr13, 3Cr14, 304 or 316 stainless steel.

[0022] As a further improvement to the above scheme, the carbon steel in the core of the composite steel plate accounts for 25-30% of the volume.

[0023] As a further improvement to the above scheme, in step two, if the middle part is carbon steel powder, after covering the end cover plate of the sleeve, the entire sleeve is placed under a pressure device for static pressure for 60-120 minutes, with a unit pressure of 30-80MPa, to press the powder and stainless steel plate tightly.

[0024] As a further improvement to the above scheme, in step three, the vacuum degree inside the casing is greater than or equal to 100 Pa.

[0025] As a further improvement to the above scheme, in step four, the first six hot rolling passes must be rolled with a large reduction, with a single pass reduction of 15-35%.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. The carbon steel-stainless steel composite steel plate used in this invention retains the advantages of carbon steel, such as high hardness, wear resistance and good re-grinding properties, while solving the problem of easy rusting on the material surface; at the same time, it reduces the amount of stainless steel used and lowers the material cost.

[0028] 2. The new heat treatment process enables both the core carbon steel and the outer stainless steel of the carbon steel composite plate to obtain excellent hardness and toughness, giving the plate excellent comprehensive performance.

[0029] 3. The invention employs hot rolling to prepare carbon steel-stainless steel composite plates for cutting tools. The plates retain the advantages of carbon steel, such as high hardness, wear resistance, and good re-grinding properties, while solving the problem of easy rusting on the material surface. The Cu layer in the cutting tool plate has bactericidal, antiviral, and microbial growth-inhibiting properties, which can significantly reduce the presence of bacteria on the tool surface. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the cross-sectional structure of the carbon steel-stainless steel composite billet of the present invention.

[0031] Figure 2 The metallographic structure of the hot-rolled carbon steel-stainless steel composite steel plate of this invention is (T8 + copper + 3Cr13).

[0032] Figure 3 The metallographic structure of the hot-rolled carbon steel-stainless steel composite steel plate of this invention is (T8 + white copper + 3Cr13).

[0033] In the diagram: 1. Encasing; 2. Welding point; 3. Core of composite board; 4. Separating layer; 5. Stainless steel plate. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0035] like Figure 1 As shown, the specific solution of this embodiment is as follows: a carbon steel composite plate for cutting tools, wherein the core 3 of the composite plate is carbon steel or carbon steel powder, the outer layer is a corrosion-resistant stainless steel plate 5, and there is a separating layer 4 between the carbon steel and the stainless steel; the outermost layer is provided with a sheath 1, which is welded through welding points 2. Initially, the outermost layer is provided with a sheath 1, and then it is oxidized.

[0036] A manufacturing process for a carbon steel composite plate for cutting tools specifically includes the following steps:

[0037] Step 1: Cleaning the surface of raw material boards: Use physical and chemical methods to remove oil, oxides and impurities from the surface of the raw material boards;

[0038] Step 2: Encasing preparation and blank assembly:

[0039] Sheath preparation: The sheath is made of steel plate welded into a box shape. The five sides of the sheath are welded together by gas shielded welding, and the upper end is left open for filling raw materials.

[0040] Blank assembly: After cleaning the surface of the sheet material, put it into a clean packaging box in sequence. The top and bottom layers are stainless steel plates, and carbon steel plates or carbon steel powder are stacked in the middle. A partition layer is placed between the carbon steel and the stainless steel. Finally, cover the box with the packaging cover plate.

[0041] Step 3, Vacuum Packaging: The assembled composite blank is fed into the vacuum packaging equipment, the air in the packaging box is removed by vacuuming, and then the packaging is sealed and welded.

[0042] Step 4, hot rolling: Heat the above-mentioned clad composite steel billet to 950-1050℃, hold it at that temperature for 1-3 hours, and then hot roll it. The initial rolling temperature is about 950-1000℃, the final rolling temperature is greater than 730℃, and the total hot rolling reduction is greater than 90%.

[0043] Step 5, Heat treatment: Annealing: Place the carbon steel composite steel plate in a gas-protected furnace and heat it to 700-800℃ and hold it for 2-4 hours for annealing. Then, cool it in the furnace to 580-650℃ and then remove it from the furnace and air cool it.

[0044] Step 6, Finishing and Slitting: Straighten the annealed carbon steel composite steel plate, cut (sawing) the ends and edges, and slit it to the appropriate size;

[0045] Step 7, Heat Treatment: Quenching: Heat the carbon steel composite steel plate to 780-880℃ for quenching, hold for 10-60 minutes, and then remove from the furnace and cool with oil or water mist.

[0046] Cryogenic treatment: After cooling to room temperature, the steel billet is transferred into a cryogenic furnace and cryogenically cooled at -150 to 80°C for 30 minutes to 2 hours.

[0047] Tempering: After deep cooling, the composite board is heated to 120-200℃ and held for 2-5 hours for tempering treatment.

[0048] As a preferred embodiment of the above, the sheath is made of 3Cr13 stainless steel plate.

[0049] As a preferred embodiment of the above, the outer layer of stainless steel in the composite plate can be stainless steel of the same material or stainless steel composed of multiple layers of stainless steel of different materials.

[0050] like Figure 2 and Figure 3 As shown, in a preferred embodiment of the above, the composite steel plate may have 5, 7 or more layers, the core carbon steel may be T8 or T10 carbon tool steel, the separator may be copper, white copper or copper-containing nickel plate, and the outer stainless steel may be 2Cr13, 3Cr13, 3Cr14, 304 or 316 stainless steel.

[0051] As a preferred embodiment of the above, the volume ratio of carbon steel in the core of the composite steel plate is 25-30%.

[0052] As a preferred embodiment of the above, in step two, if the middle part is carbon steel powder, after covering the end cover plate of the sleeve, the entire sleeve is placed under a pressure device for static pressure for 60-120 minutes, with a unit pressure of 30-80 MPa, to press the powder and stainless steel plate together.

[0053] As a preferred embodiment of the above, in step three, the vacuum degree inside the casing is greater than or equal to 100 Pa.

[0054] As a preferred embodiment of the above, in step four, the first six hot rolling passes must be rolled with a large reduction, with a single pass reduction of 15-35%.

[0055] Example 1: T8 carbon steel composite steel plate

[0056] Step 1: Clean the surface of the steel plate raw materials. Use ultrasonic cleaning to remove oil and impurities from the surface of 3Cr13 stainless steel and T8 steel plates.

[0057] Step 2: Packaging preparation and raw material filling:

[0058] Sheath preparation: The sheath is made of 4mm thick 3Cr13 stainless steel and welded into a box shape. The five sides of the sheath are welded together by gas shielded welding, and the upper end is left open for filling raw materials.

[0059] Raw material loading: Load the plates into the packaging box in the following order: 3Cr13 stainless steel, copper plate, T8 carbon steel, copper plate, and 3Cr13 stainless steel. The thickness of 3Cr13 stainless steel is 59mm, the thickness of copper plate is 1mm, and the thickness of T8 carbon steel is 40mm. Cover the top of the packaging box with the cover plate.

[0060] Step 3, Vacuum Sealing: Transfer the shroud blank into a vacuum pump to remove air from the shroud box to a vacuum level of 10 Pa. Then, use an electron beam welder to weld and seal the end cap.

[0061] Step 4, Hot rolling: The vacuum-sealed carbon steel-stainless steel composite billet is heated to 1020℃, held for 2 hours and then hot rolled. The initial rolling temperature is 1000℃ and the final rolling temperature is 830℃. The billet is hot rolled into a coil with a thickness of 3mm. The total hot rolling reduction is 98.2%.

[0062] Step 5, Heat treatment: Annealing: Place the carbon steel composite steel plate (or coil) in a gas-protected furnace and heat it to 750℃ and hold it for 3 hours for annealing. Then, cool it in the furnace to 610℃ and then remove it from the furnace and air cool it.

[0063] Step 6: After annealing, the carbon steel composite steel sheet (coil) is straightened and finished by slitting to obtain a sheet with a flat surface and suitable size.

[0064] Step 7, Quenching: Place the carbon steel composite steel plate in a quenching furnace and heat it to a quenching temperature of 820℃. After holding it at that temperature for 2 hours, remove it from the furnace and quench it with water mist, then cool it to room temperature.

[0065] Cryogenic treatment: After cooling to room temperature, the steel billet is transferred into a cryogenic furnace and cryogenically cooled at -110℃ for 1 hour;

[0066] Tempering: The composite board after deep cooling is heated to 150℃ and held for 3 hours for tempering treatment.

[0067] The tempered composite sheet possesses both hardness and toughness, with a carbon steel core hardness of 59-60 HRC and an outer stainless steel layer hardness of 52-53 HRC. The composite sheet (3.0 mm) has an impact absorption energy of 15 J.

[0068] Example 2: T10 carbon steel composite steel plate

[0069] Step 1: Clean the surface of the steel plate raw materials. Use ultrasonic cleaning to remove oil and impurities from the surface of 4Cr13 stainless steel and T10 steel plates.

[0070] Step 2: Packaging preparation and raw material filling:

[0071] Sheath preparation: The sheath is made of 4mm thick 3Cr13 stainless steel and welded into a box shape. The sheath is welded with gas shielded welding and an opening is reserved on the upper end for filling raw materials.

[0072] Raw material filling: In sequence, stack 10 layers of 2mm thick 304 and 4Cr13 alternately, then a layer of 15mm thick 4Cr13, a layer of 1mm thick white copper plate, a layer of 45mm thick T10 carbon steel, a layer of 1mm thick white copper plate, a layer of 15mm thick 4Cr13, and then stack 10 layers of 2mm thick 4Cr13 and 304 alternately. Put them into the packaging box, and then cover the top cover of the packaging box.

[0073] Step 3, Vacuum Sealing: Transfer the shroud blank into a vacuum pump to remove air from the shroud box to a vacuum level of 10 Pa. Then, use an electron beam welder to weld and seal the end cap.

[0074] Step 4, Hot rolling: The vacuum-sealed carbon steel-stainless steel composite billet is heated to 1030℃, held at that temperature for 3 hours, and then hot rolled. The initial rolling temperature is 1000℃, and the final rolling temperature is 810℃. The billet is hot rolled into coils or plates with a thickness of 3mm. The total hot rolling reduction is 98.1%.

[0075] Step 5, Heat treatment: Annealing: Place the carbon steel composite steel plate (or coil) in a gas-protected furnace and heat it to 760℃ and hold it for 3 hours for annealing. Then, cool it in the furnace to 610℃ and then remove it from the furnace and air cool it.

[0076] Step 6: After annealing, the carbon steel composite steel sheet (coil) is straightened and finished by slitting to obtain a sheet with a flat surface and suitable size.

[0077] Step 7, Quenching: Place the carbon steel composite steel plate in a quenching furnace and heat it to a quenching temperature of 830℃. After holding it at that temperature for 2 hours, remove it from the furnace and oil quench it, then cool it to room temperature.

[0078] Cryogenic treatment: After cooling to room temperature, the steel billet is transferred into a cryogenic furnace and cryogenically cooled at -120℃ for 1 hour;

[0079] Tempering: The composite board after cryogenic heating is heated to 180℃ and held for 3 hours for tempering treatment.

[0080] The tempered composite sheet possesses both hardness and toughness, with a carbon steel core hardness of approximately 60 HRC and an outer stainless steel layer hardness of approximately 52 HRC. The composite sheet (3.0 mm) has an impact absorption energy of 13-15 J.

[0081] It should be noted that, in this document, the terms "including," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the technical solutions of this invention. The above examples are merely to help understand the method and core ideas of this invention. The above are only preferred embodiments of this invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this invention.

Claims

1. A manufacturing process for a carbon steel composite plate for cutting tools, characterized in that, The core of the composite panel is carbon steel or carbon steel powder, and the outer layer is corrosion-resistant stainless steel. There is a separating layer between the carbon steel and stainless steel, specifically including... The following steps: Step 1: Cleaning the surface of raw material boards: Use physical and chemical methods to remove oil, oxides and impurities from the surface of the raw material boards; Step 2: Encasing preparation and blank assembly: Sheath preparation: The sheath is made of steel plate welded into a box shape, and the five sides of the sheath are welded together by gas shielded welding, with the upper end face reserved for filling raw materials; Blank assembly: After cleaning the surface of the sheet material, put it into a clean packaging box in sequence. The top and bottom layers are stainless steel plates, and carbon steel plates or carbon steel powder are stacked in the middle. A partition layer is placed between the carbon steel and the stainless steel. Finally, cover the box with the packaging cover plate. Step 3, Vacuum Packaging: The assembled composite blank is fed into the vacuum packaging equipment, the air in the packaging box is removed by vacuuming, and then the packaging is sealed and welded. Step 4, Hot rolling: Heat the above-mentioned clad composite steel billet to 950-1050℃, hold for 1-3 hours and then hot roll. The initial rolling temperature is 950-1000℃, the final rolling temperature is greater than 730℃, and the total hot rolling reduction is greater than 90%. Step 5, Heat treatment: Annealing: Place the carbon steel composite plate in a gas-protected furnace and heat it to 700-800℃ and hold it for 2-4 hours for annealing. Then, cool it in the furnace to 580-650℃ and then remove it from the furnace and air cool it. Step 6, Finishing and Slitting: Straighten, cut or saw the ends and edges of the annealed carbon steel composite sheet, and slit it to the appropriate size; Step 7, Heat Treatment: Quenching: Heat the carbon steel composite plate to 780-880℃ for quenching, hold for 10-60 minutes, and then remove from the furnace and cool with oil or water mist. Cryogenic treatment: After cooling to room temperature, the steel billet is transferred into a cryogenic furnace and cryogenically cooled at -150~-80℃ for 30 minutes to 2 hours. Tempering: After cryogenic treatment, the composite board is heated to 120-200℃ and held for 2-5 hours for tempering. The cladding is made of 3Cr13 stainless steel plate; the outer layer of stainless steel in the composite plate is made of the same material or multiple layers of stainless steel of different materials; the composite plate has 5, 7 or more layers, the core carbon steel is T8 or T10 carbon tool steel, the separator is copper, cupronickel or nickel plate containing copper, and the outer stainless steel is 2Cr13, 3Cr13, 3Cr14, 304 or 316 stainless steel; the core carbon steel accounts for 25-30% of the volume of the composite plate.

2. The manufacturing process of a carbon steel composite plate for cutting tools according to claim 1, characterized in that, In step two, if the middle part is carbon steel powder, after covering it with the end cover plate, place the entire package under a pressure device and press it statically for 60-120 minutes at a unit pressure of 30-80 MPa to press the powder and stainless steel plate together.

3. The manufacturing process of a carbon steel composite plate for cutting tools according to claim 1, characterized in that, In step four, the first six hot rolling passes must use a large reduction rolling, with a single pass reduction of 15-35%.

Images