High-strength and high-toughness durable antibacterial cutter material, preparation method thereof and cutter

Abstract

The invention discloses a high-strength and high-toughness durable antibacterial cutter material, a preparation method thereof and a cutter, and belongs to the technical field of cutter materials. The cutter material takes Fe as a matrix, and further comprises C, Si, S, P, Mn, MoCr, Ag, Nb elements and inevitable impurities, the addition amount of the Nb element accounts for 0.01-0.03 wt% of the whole material, and the addition amount of the Ag element accounts for 0.01-0.2 wt% of the whole material; the weight ratio of the Nb element to the C element is (0.008-0.12): 1, and the weight ratio of the Cr element to the C element is (10-72): 1. According to the cutter material, a proper amount of Ag is added into a stainless steel base material, the durable antibacterial effect can be achieved, and the added Nb element can promote carbide precipitation, so that the material has the properties of high toughness, high strength and durable sharpness.

Description

Technical Field

[0001] The present application relates to a high-strength, high-toughness, durable antibacterial tool material, a preparation method thereof, and a tool, belonging to the technical field of tool materials. Background Art

[0002] Knives are used at room temperature to cut food, and antibacterial knives are becoming more and more popular among consumers. There are two main types of antibacterial knives on the market. The first is to achieve antibacterial effect through coating, and the other is to achieve antibacterial effect through copper-containing antibacterial stainless steel.

[0003] The first type of antibacterial tool prepared by coating has a non-wear-resistant surface coating that is easy to fall off. After the coating falls off, the antibacterial effect drops sharply, or even has no antibacterial effect, and cannot achieve long-term antibacterial effect. The second type of copper-containing antibacterial stainless steel must have a copper content of more than 4% to achieve a good antibacterial effect. A high copper content leads to poor mechanical properties of the material, and cannot meet the requirements of tool sharpness, high strength and high toughness.

[0004] Therefore, there is an urgent need for a tool material that can achieve long-lasting antibacterial properties while also having high toughness, high strength and long-lasting sharpness. Summary of the invention

[0005] In order to solve the above problems, a high-strength, high-toughness and long-lasting antibacterial tool material is provided. The tool material adds an appropriate amount of Ag to the stainless steel base material to achieve long-lasting antibacterial properties, and the added Nb element can promote the precipitation of carbides, so that the material has high toughness, high strength and long-lasting sharpness.

[0006] According to one aspect of the present application, a high-strength, high-toughness, long-lasting antibacterial tool material is provided, which is based on Fe and further includes C, Si, S, P, Mn, Cr, Ag, Nb elements and inevitable impurities, wherein the addition amount of the Ag element accounts for 0.01 to 0.2 wt% of the whole material, and the Ag element is uniformly distributed in the tool material;

[0007] The weight ratio of the Nb element to the C element is 0.008-0.12:1, and the weight ratio of the Cr element to the C element is 10-72:1.

[0008] The tool material is stainless steel, and C, Si, S, P, Mn, Ti, Cr, Ag, and Nb elements are added to an Fe matrix, which can optimize the mechanical properties of the tool material, significantly improve its toughness and strength, and after being prepared into a tool, the long-term sharpness of the tool can be improved.

[0009] The Nb element added to the above-mentioned tool can promote the precipitation of carbides during the smelting of the tool material. Nb and C form a strong NbC bonding structure, and at the same time form an isomorphous solid solution mixture, which strengthens the uniformity of the distribution of the steel structure to improve the toughness, strength and long-term sharpness of the tool material. In addition, a small amount of Nb can improve its welding performance, thereby improving the machinability of the tool material. When the ratio of Nb to C is less than 0.008:1, it cannot effectively promote the precipitation of carbides, and thus cannot significantly improve the mechanical properties and long-term sharpness of the tool material; however, the content of Nb element is not the more the better. When the ratio is greater than 0.12:1, the NbC content is too high, which will reduce the elongation of the tool material, reduce the shape plasticity of the tool material, and limit the diversity of the tool shape. Moreover, when the Nb element is too much, it will cause excessive precipitation of the C element, resulting in uneven distribution of the C element in the steel, affecting the basic performance of the steel, and instead causing the mechanical properties of the steel to decrease.

[0010] C in the above tool materials is the first alloying element in stainless steel. It plays an absolute role in the organization and performance of steel. Its main working mechanism is to strengthen the performance of steel and ensure the austenite phase temperature in steel. Its role is about 30 times that of Ni. However, C and chromium elements will combine to produce many complex carbides, which have a lot of influence on the performance of steel. The higher the C content, the stronger and harder the stainless steel will be. However, if the C content is too high, the extra carbon will form CCr with chromium, and the Cr in the martensite organization will be significantly reduced, which will affect the corrosion resistance of stainless steel.

[0011] Cr is an important alloying element in stainless steel. The biggest role of Cr is to improve the corrosion resistance of stainless steel. Cr can significantly increase the pitting potential value of stainless steel and reduce the pitting sensitivity of stainless steel. Cr can form a very stable, thin and dense oxide film on the surface of stainless steel to prevent stainless steel from being corroded. At the same time, Cr can significantly improve the hardenability of tool materials, which is beneficial to control the transformation rate of austenite to martensite and carbide, shift the austenite isothermal transformation curve to the right, and reduce the critical cooling rate of quenching of steel.

[0012] The weight ratio of the Cr element to the C element is 10-72:1, which can reduce the amount of CCr and increase the Cr content in the martensite structure, thereby improving the corrosion resistance of the material and the hardenability of the tool material. If the weight ratio of the Cr element to the C element is less than 10:1, the carbon content is too large and will combine with Cr to form chromium nitride, resulting in a decrease in the chromium content in the martensite, and ultimately making the corrosion resistance of the material in an ordinary kitchen environment unable to meet the requirements; if the weight ratio of the Cr element to the C element is greater than 72:1, the Cr content is too high, making the material brittle, and the possibility of chipping during use increases, affecting the material performance.

[0013] The weight ratio of the Nb element to the C element is 0.008-0.12:1, which can ensure the precipitation of NbC and the formation of an isomorphous solid solution mixture, thereby strengthening the distribution of the steel structure to improve the mechanical properties of the tool material. If the weight ratio of the Nb element to the C element is less than 0.008:1, the content of the Nb element is too small, and the formed NbC structure is too trace, which is difficult to play the effect of strengthening the toughness of the steel. If the weight ratio of the Nb element to the C element is greater than 0.12:1, on the one hand, the excessively high NbC content will significantly increase the hardness of the tool material, which will bring difficulties to the subsequent forming and sharpening processes; on the other hand, the Nb element and its compounds will still affect the subsequent food hygiene testing, and excessive content will cause the tool material to be unable to be used in the field of kitchen knives.

[0014] The Ag element added to the above-mentioned tool material is a very common antibacterial element in daily life. Most metal ions in nature have strong bactericidal ability, and the antibacterial ability is arranged in the following order: Ag>Co≥Ni≥Al≥Zn≥Cu>Fe>Mn≥Sn≥Ba≥Mg≥Ca. However, in order to protect human health, only silver ions are relatively safe among the above-mentioned antibacterial elements. Ag ions can form strong bonds with some substances used by some microorganisms for breathing, such as some molecules containing O, S, and N elements, so that these substances cannot be used by microorganisms, thereby causing the microorganisms to suffocate and die. Therefore, considering the safety and antibacterial properties, and combined with cost considerations, the tool material of this application is best made of Ag ions. Taking into account the antibacterial properties and mechanical properties of the tool material, the amount of Ag added to the tool material is 0.01~0.2wt%.

[0015] Optionally, the Mo element is further included, and the weight ratio of the Mo element to the Fe element is 0.0001-0.02:1.

[0016] Mo is an element that forms ferrite. Its addition can improve the strength and hardness of martensitic stainless steel, increase tempering stability, and ensure that the steel has good toughness and high hardness at the same time. Mo also has a certain effect on quenching hardness. As the Mo content increases, the quenching hardness increases. However, the Mo content in this tool material cannot be too high. If its content is too high, δ-ferrite will be generated, which will reduce the ductility of the tool material and also affect the shape diversity of the tool material. Therefore, the weight ratio of Mo element to Fe element is limited to 0.0001-0.02:1 here, which can synergistically improve the various performances of the tool material. If the weight ratio of Mo element to Fe element is less than 0.0001:1, the Mo element content is too low and it is difficult to play its role; if the weight ratio of Mo element to Fe element is greater than 0.12:1, the δ-ferrite content formed is too high, which affects the ductility and impact resistance of the tool material.

[0017] Optionally, the added amount of the Nb element accounts for 0.01-0.03wt% of the entire material.

[0018] Based on the food hygiene requirements for kitchen knives, the precipitation amount of certain metal elements is restricted. Based on experiments, the content of Nb is controlled within the range of 0.01wt% to 0.03wt%, which combines the performance improvement effect of Nb on the knife material with the requirements of food hygiene, so that the knife material can meet the needs of kitchen knife scenarios.

[0019] Optionally, the weight ratio of the Mn element to the S element is 200-600:1.

[0020] S in this tool material is an inevitable impurity. It forms FeS with the Fe matrix, which will bring hot brittleness to the steel, so its content should be as low as possible. Mn is a deoxidizer for this tool material. Its addition can improve the hardenability of the tool material, and Mn and S will form MnS, avoiding the formation of FeS film on the grain boundary, thereby eliminating the hot brittleness of the steel and improving the processing performance. Therefore, the weight ratio of Mn element to S element is limited to 200-600:1, which can achieve the best effect of eliminating hot brittleness and significantly improve the processing performance. If the weight ratio of Mn element to S element is less than 200:1, there will be excess S element to form FeS with Fe element, making the material hot brittle and affecting the performance of the material; if the weight ratio of Mn element to S element is greater than 600:1, the residual Mn element will increase the brittleness of the tool material and reduce the durability of the tool material.

[0021] The Ag element is evenly distributed in the tool material in the form of ions.

[0022] The Ag element distributed in the form of ions is dispersed more evenly in the tool material, so the volume of the area where the Ag element is distributed can be significantly increased relative to the total volume of the high-strength, high-toughness, long-lasting antibacterial tool material, thereby improving the long-lasting antibacterial properties of the tool material, and the core can still maintain a good antibacterial effect after surface wear.

[0023] Optionally, the tool material comprises, by weight percentage: C: 0.25-1.2wt%, Si≤0.2wt%, S≤0.001wt%, P≤0.01wt%, Mn: 0.2-0.6wt%, Mo: 0.01-1.5wt%, Cr: 12-18wt%, V: 0-1wt%, Ag: 0.01-0.2wt%, Ti: 0-0.05wt%, Nb: 0.01-0.03wt%, and the rest is iron and unavoidable impurities.

[0024] Si is generally used as a deoxidizer in steel. An increase in Si content will increase the possibility of C inclusions in the steel. P forms microsegregation when the molten steel solidifies, and then segregates at the grain boundaries when heated to the austenitizing temperature, causing the steel to become cold and brittle. Therefore, the lower the P content, the better. In this application, the P content is controlled to be below 0.01%.

[0025] In addition, considering the strength and corrosion resistance of the tool material, the C content is determined to be 0.25-1.2wt%; based on the higher carbon content, in order to ensure corrosion resistance, the Cr content is 12-18wt%; in order to reduce the formation of δ-ferrite, the Mo content is controlled to 0.01-1.5wt%, preferably 0.01-1.0wt%; in order to reduce the FeS content, S is controlled below 0.001wt%.

[0026] The above-mentioned tool material also contains Ti element, which can also promote the precipitation of carbides, form a strong TiC bonding structure with C, and can also form an isomorphous solid solution mixture at the same time, thereby playing a role in strengthening the steel structure.

[0027] The content of C in the tool material of the present application can be 0.25wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1.0wt%, 1.1wt%, 1.2wt% and any content therebetween; the content of Mn can be 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt% and any content therebetween; the content of Mo can be 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1.0wt%, 1.1wt%, 1.2wt%, 1.3wt%, 1.4wt%, 1.5wt% and any content therebetween; the content of Cr can be 12wt%. t%, 13wt%, 14wt%, 15wt%, 16wt%, 17wt%, 18wt% and any content therebetween; the V content may be 0.1wt%, 0.2wt%, 0.3wt%, 0.4wt%, 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt%, 1.0wt% and any content therebetween; the Ag content may be 0.01wt%, 0.05wt%, 0.10wt%, 0.15wt%, 0.20wt% and any content therebetween; the Ti content may be 0.01wt%, 0.02wt%, 0.03wt%, 0.04wt%, 0.05wt% and any content therebetween; the Nb content may be 0.01wt%, 0.02wt%, 0.03wt% and any content therebetween.

[0028] According to another aspect of the present application, a method for preparing the high-strength, high-toughness, durable antibacterial tool material as described in any one of the above items is provided, comprising the following steps:

[0029] (1) placing the raw materials in a smelting furnace for smelting, and then hot rolling and annealing to obtain a semi-finished product;

[0030] (2) The semi-finished product is subjected to cold rolling and secondary annealing to obtain a high-strength, high-toughness, and durable antibacterial material.

[0031] The above raw materials can melt and precipitate corresponding phases and form compounds during smelting, thereby achieving long-lasting antibacterial properties and taking into account high toughness, high strength and long-lasting sharpness. The primary annealing and secondary annealing treatments can achieve the homogenization of elements in the tool material, reduce internal defects and stress concentration in the material, and ensure the quality of subsequent processing.

[0032] Optionally, in step (1), Ag and Nb elements are added to the smelting furnace by atomization, specifically:

[0033] An atomization system is added above the smelting furnace, wherein the atomization system includes a crucible and a blowing device. Ag and Nb elements are placed in the crucible, heated to melt them, and the blowing device is used to blow inert gas to blow the molten Ag and Nb into the smelting furnace.

[0034] In the above method, Ag and Nb elements are melted in a crucible and atomized by inert gas. The added trace elements are more uniform after atomization, and the dispersion strengthening effect of the tool material is better. In addition, in the process of blowing the molten Ag and Nb into the melting furnace by inert gas, the inert gas can also refine the raw materials, reduce impurities in the tool material, and further improve the mechanical properties of the tool material.

[0035] Optionally, the blowing device includes four air supply pipes, and the air supply rate of any air supply pipe is 100L / min to 120L / min.

[0036] The four air supply pipes can add Ag and Nb to the smelting furnace in different directions, further improving the dispersion uniformity of the two elements in all raw materials, thereby improving all aspects of the performance of the tool material; the air supply rate of the air supply pipe can ensure the efficient and uniform delivery of Ag and Nb elements, reduce the formation of impurities or unfavorable structures, and thus improve the performance of the tool material.

[0037] Optionally, specific operations of the primary annealing treatment and the secondary annealing treatment are:

[0038] S1: Heat the material to 570-590℃ and keep it warm for 3h;

[0039] S2: then raise the temperature to 610-630℃ and keep it for 9h;

[0040] S3: Heat up to 1240-1260℃ and keep warm for 38h;

[0041] S4: then cool down to 610-630°C;

[0042] S5: Finally the air is cooled to room temperature.

[0043] The annealing treatment adopts a three-stage heating-up-and-keeping treatment and a two-stage cooling treatment, which can promote the uniform dispersion of the components of the above-mentioned materials and form corresponding phases, and can also reduce the internal stress of the materials.

[0044] Preferably, in step S4, the cooling rate to 610-630°C is 2.5-3°C / min.

[0045] Preferably, the smelting in step (1) includes LF process external refining, VD vacuum degassing and electroslag remelting.

[0046] The VD vacuum degassing in this step can effectively remove gas inclusions and improve the purity of stainless steel.

[0047] Preferably, the VD vacuum degassing uses argon gas with a pressure of 1.5 MPa and a duration of 1 hour.

[0048] According to another aspect of the present application, there is provided a cutting tool, which is processed by using any of the high-strength, high-toughness, long-lasting antibacterial cutting tool materials described above or the high-strength, high-toughness, long-lasting antibacterial cutting tool materials prepared by any of the preparation methods described above;

[0049] The Ag element is evenly distributed in the tool material in the form of ions.

[0050] This setting can achieve a long-lasting antibacterial effect, and the core can still maintain a good antibacterial effect after the surface is worn, thereby extending the service life of the tool and the antibacterial effect.

[0051] The beneficial effects of this application include but are not limited to:

[0052] 1. The high-strength, high-toughness, long-lasting antibacterial knife material according to the present application has the ability to achieve long-lasting antibacterial properties while also having high toughness, high strength, and long-lasting sharpness, and can be used in the fields of kitchen knives, medical knives, outdoor knives, and the like.

[0053] 2. According to the high-strength, high-toughness and long-lasting antibacterial tool material of the present application, the Ag element is distributed in the form of ions, which can achieve long-lasting antibacterial and high safety performance. The added trace Nb element promotes the precipitation of carbides, and Nb and C form a strong binding structure of NbC, while forming an isomorphous solid solution mixture, which strengthens the organizational properties of the steel, thereby improving the toughness, strength and long-lasting sharpness of the material.

[0054] 3. According to the high-strength, high-toughness, long-lasting antibacterial tool material of the present application, the addition of Nb can enhance the toughness and strength of the steel, and a small amount of addition can improve its welding performance, thereby improving the processing performance of the tool material.

[0055] 4. According to the preparation method of high-strength, high-toughness and durable antibacterial tool material of the present application, Ag and Nb elements are added by atomization. The structure formed by the added Ag and Nb elements in the material after atomization is more uniform, the dispersion strengthening effect is better, and the mechanical properties of the material are significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0057] Figure 1 This is a side view of the atomization system involved in Example 1 of the present application.

[0058] Figure 2 This is a bottom view of the atomization system involved in Example 1 of the present application.

[0059] Figure 3 This is the Ag element distribution diagram of the tool material 2# involved in Example 2 of the present application.

[0060] Figure 4 This is a test chart of hardness and impact toughness of tool materials 1#, 3#, and 4# involved in Example 2 of the present application.

[0061] Figure 5 This is a self-corrosion potential test diagram of tool materials 5#, 5Cr15MoV, and 9Cr18MoV involved in Example 2 of the present application.

[0062] Figure 6 This is the 72H salt spray test diagram of tool materials 5#, 5Cr15MoV and 9Cr18MoV involved in Example 2 of the present application.

[0063] Figure 7 This is an impact test diagram of tool material 5# involved in Example 2 of the present application and commonly used tool materials.

[0064] List of parts and reference numerals:

[0065] 1. Crucible; 2. Air supply pipe; 10. Outlet. DETAILED DESCRIPTION

[0066] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0067] Unless otherwise specified, the raw materials in the examples and comparative examples of the present application were purchased through commercial channels.

[0068] Unless otherwise specified, the methods used in the examples and comparative examples of the present application are conventional methods in the prior art.

[0069] Example 1

[0070] refer to Figure 1 and Figure 2 The present embodiment relates to an atomization system on a smelting furnace, which includes a crucible 1 and a blowing device. A flow outlet 10 is provided at the bottom of the crucible. The blowing device includes four symmetrically arranged air supply pipes 2 and a bracket. Each air supply pipe 2 is connected to the crucible 1 through the bracket.

[0071] When the atomization system is in use: the crucible 1 contains Ag and Nb elements, and the crucible 1 is heated by a heating device (not shown in the figure). The crucible 1 transfers heat to the Ag and Nb elements, thereby realizing the melting of the Ag and Nb elements. The melted Ag and Nb elements are in a molten state, and flow out of the crucible 1 through the outflow port 10. An inert gas is blown into one end of the air supply pipe 2. The air flow blown out of the symmetrically arranged air supply pipe 2 can form a spiral protective gas layer, which is blown into the smelting furnace. In this process, the air supply setting of the air supply pipe 2 can protect the molten metal and promote the uniform distribution of metal ions in the steel.

[0072] Specifically, the method of blowing inert gas into one end of the air supply pipe 3 can adopt the method commonly used in the prior art, for example, the inert air can be compressed to a certain pressure by a compressor, and then the compressed inert air is sent into the air supply pipe 3 to blow the molten Ag and Nb elements.

[0073] Example 2

[0074] The present embodiment relates to a high-strength, high-toughness, durable antibacterial tool material and a preparation method thereof. The tool material comprises, by weight percentage: C: 0.25-1.2wt%, Si≤0.2wt%, S≤0.001wt%, P≤0.01wt%, Mn: 0.2-0.6wt%, Mo: 0.01-1.5wt%, Cr: 12-18wt%, V: 0-1wt%, Ag: 0.01-0.2wt%, Ti: 0-0.05wt%, Nb: 0.01-0.03wt%, and the rest is iron and unavoidable impurities.

[0075] Preferably, the tool material further comprises Mo element, the content of the Mo element is 0.01-1.5wt%, and the weight ratio of the Mo element to the Fe element is 0.0001-0.02:1.

[0076] The preparation method thereof comprises the following steps:

[0077] (1) placing the raw materials in a smelting furnace for smelting, adding the atomization system of Example 1 above the smelting furnace, placing Ag and Nb elements in a crucible, heating them to melt them, blowing inert gas into the molten Ag and Nb into the smelting furnace through an air supply pipe, the air supply rate of the air supply pipe is 100L / min to 120L / min, and then hot rolling and primary annealing to obtain a semi-finished product;

[0078] (2) The semi-finished product is subjected to cold rolling and secondary annealing to obtain a high-strength, high-toughness, and durable antibacterial material.

[0079] Preferably, the specific operations of the primary annealing treatment and the secondary annealing treatment are:

[0080] S1: Heat the material to 570-590℃ and keep it warm for 3h;

[0081] S2: then raise the temperature to 610-630℃ and keep it for 9h;

[0082] S3: Heat up to 1240-1260℃ and keep warm for 38h;

[0083] S4: Then cool down to 610-630°C at a cooling rate of 2.5-3°C / min;

[0084] S5: Finally the air is cooled to room temperature.

[0085] The advantage of the multi-stage heating method is that the temperature is kept warm after each stage of heating, so that there is enough time at this temperature to allow as many lattice structures as possible to be converted into martensite, and after subsequent heating, the lattice structure that has not been converted into martensite is further converted into martensite structure. That is, each heating stage has enough time to convert the structure into martensite structure, thereby increasing the content of martensite structure in the finished product, thereby improving the hardness performance of the tool material.

[0086] Preferably, the smelting in step (1) includes LF process external refining, VD vacuum degassing and electroslag remelting, and the VD vacuum degassing uses argon gas with a pressure of 1.5 MPa and a duration of 1 hour.

[0087] According to the above preparation method, tool materials 1#-18# and comparative tool materials D1#-D5# are prepared, and the specific preparation is as follows:

[0088] Tool material 1#

[0089] The tool material 1# includes, by weight percentage: C: 1.2wt%, Si: 0.1wt%, S: 0.001wt%, P: 0.01wt%, Mn: 0.2wt%, Cr: 12wt%, Ag: 0.2wt%, Nb: 0.01wt%, and the rest is iron and inevitable impurities.

[0090] The method for preparing tool material 1# comprises the following steps:

[0091] (1) placing the raw materials in a smelting furnace for LF process external refining, VD vacuum degassing and electroslag remelting, wherein the VD vacuum degassing uses argon gas with a pressure of 1.5 MPa and a duration of 1 h, adding the atomization system of Example 1 above the smelting furnace, placing Ag and Nb elements in a crucible, heating them to melt them, and blowing inert gas into the molten Ag and Nb into the smelting furnace through an air delivery pipe, wherein the air delivery rate of the air delivery pipe is 120 L / min, and then hot rolling and primary annealing are performed to obtain a semi-finished product;

[0092] (2) The semi-finished product is subjected to cold rolling and secondary annealing treatment to obtain a high-strength, high-toughness, and durable antibacterial material, wherein the specific operations of the primary annealing treatment and the secondary annealing treatment are as follows:

[0093] S1: Heat the material to 570℃ and keep it for 3h;

[0094] S2: then raise the temperature to 610℃ and keep it for 9h;

[0095] S3: Heat up to 1240℃ and keep warm for 38h;

[0096] S4: then cooling down to 610°C at a cooling rate of 3°C / min;

[0097] S5: Finally the air is cooled to room temperature.

[0098] Tool material 2#

[0099] The tool material 2# includes, by weight percentage: C: 0.25wt%, Si: 0.2wt%, S: 0.001wt%, P: 0.01wt%, Mn: 0.6wt%, Cr: 18wt%, V: 1wt%, Ag: 0.01wt%, Ti: 0.05wt%, Nb: 0.03wt%, and the rest is iron and inevitable impurities.

[0100] The method for preparing tool material 2# comprises the following steps:

[0101] (1) placing the raw materials in a smelting furnace for LF process external refining, VD vacuum degassing and electroslag remelting, wherein the VD vacuum degassing uses argon gas with a pressure of 1.5 MPa and a duration of 1 h, adding the atomization system of Example 1 above the smelting furnace, placing Ag and Nb elements in a crucible, heating them to melt them, and blowing inert gas into the molten Ag and Nb into the smelting furnace through an air delivery pipe, wherein the air delivery rate of the air delivery pipe is 100 L / min, and then hot rolling and primary annealing are performed to obtain a semi-finished product;

[0102] (2) The semi-finished product is subjected to cold rolling and secondary annealing treatment to obtain a high-strength, high-toughness, and durable antibacterial material, wherein the specific operations of the primary annealing treatment and the secondary annealing treatment are as follows:

[0103] S1: Heat the material to 590℃ and keep it for 3h;

[0104] S2: then raise the temperature to 630℃ and keep it for 9h;

[0105] S3: Heat up to 1260℃ and keep warm for 38h;

[0106] S4: then cooling down to 630°C at a cooling rate of 2.5°C / min;

[0107] S5: Finally the air is cooled to room temperature.

[0108] Tool material 3#

[0109] The tool material 3# includes, by weight percentage: C: 0.1wt%, Si: 0.2wt%, S: 0.001wt%, P: 0.01wt%, Mn: 0.5wt%, Cr: 16wt%, V: 0.5wt%, Ag: 0.01wt%, Ti: 0.05wt%, Nb: 0.01wt%, and the rest is iron and inevitable impurities.

[0110] The method for preparing tool material 3# comprises the following steps:

[0111] (1) placing the raw materials in a smelting furnace for LF process external refining, VD vacuum degassing and electroslag remelting, wherein the VD vacuum degassing uses argon gas with a pressure of 1.5 MPa and a duration of 1 h, adding the atomization system of Example 1 above the smelting furnace, placing Ag and Nb elements in a crucible, heating them to melt them, and blowing inert gas into the molten Ag and Nb into the smelting furnace through an air delivery pipe, wherein the air delivery rate of the air delivery pipe is 110 L / min, and then hot rolling and primary annealing are performed to obtain a semi-finished product;

[0112] (2) The semi-finished product is subjected to cold rolling and secondary annealing treatment to obtain a high-strength, high-toughness, and durable antibacterial material, wherein the specific operations of the primary annealing treatment and the secondary annealing treatment are as follows:

[0113] S1: Heat the material to 580℃ and keep it for 3h;

[0114] S2: then raise the temperature to 620℃ and keep it for 9h;

[0115] S3: Heat up to 1250℃ and keep warm for 38h;

[0116] S4: then cooling down to 620°C at a cooling rate of 2.5°C / min;

[0117] S5: Finally the air is cooled to room temperature.

[0118] Tool material 4#

[0119] The difference between this tool material and tool material 3# is that it also includes 0.01wt% Mo, and the rest is the same as tool material 3#.

[0120] Tool material 5#

[0121] The difference between this tool material and tool material 3# is that the tool material 5# includes, by weight percentage: C: 1.2wt%, Si: 0.2wt%, S: 0.001wt%, P: 0.01wt%, Mn: 0.6wt%, Mo: 1.5wt%, Cr: 18wt%, V: 1wt%, Ag: 0.2wt%, Ti: 0.05wt%, Nb: 0.03wt%, and the rest is iron and unavoidable impurities, and the rest is the same as tool material 3#.

[0122] Comparison tool material D1#

[0123] The difference between this comparative tool material and tool material 3# is that Nb element and Ag element are not added, and the rest is the same as tool material 3#.

[0124] Test Example 1

[0125] The silver element distribution test was performed on the tool material prepared in Example 2. The test method was to measure by energy spectrum analysis to determine the distribution of the Ag element on the measurement surface. The specific operation scheme of energy spectrum analysis refers to the existing technology and is not described here. Based on the strong antibacterial property of the Ag element, it is generally believed that as long as the silver element is distributed, it means that the area has antibacterial properties. The test diagram of tool material 2# is shown in Figure 3 It can be seen that the Ag ions are distributed very evenly in the tool material, proving that the tool material has long-lasting antibacterial properties.

[0126] Test Example 2

[0127] The tool material of Example 2 was subjected to an antibacterial test. The test results are shown in Table 1. The specific test method is as follows:

[0128] Escherichia coli: Escherichia coli ATCC8739 was used for testing, and the bacterial concentration was 6.3×10 5 CFU / ml, inoculation volume is 0.4ml, sample size is 50mm×50mm, and covering film size is 40mm×40mm.

[0129] Staphylococcus aureus: Staphylococcus aureus ATCC6538 was used for testing, and the bacterial solution concentration was 6.0×10 5 CFU / ml, inoculation volume is 0.4ml, sample size is 50mm×50mm, and covering film size is 40mm×40mm.

[0130] Candida albicans: Candida albicans ATCC10231 was used for testing, and the bacterial solution concentration was 2.8×10 5 CFU / ml, inoculation volume is 0.4ml, sample size is 50mm×50mm, and covering film size is 40mm×40mm.

[0131] Pseudomonas aeruginosa: Pseudomonas aeruginosa ATCC9027 was used for testing, and the bacterial solution concentration was 4.5×10 5 CFU / ml, inoculation volume is 0.4ml, sample size is 50mm×50mm, and covering film size is 40mm×40mm.

[0132] Table 1

[0133]

[0134] Test Example 3

[0135] The tool material of Example 2 was subjected to an antiviral test, and the test results are shown in Table 2. The test included antiviral activity detection of common viruses such as enterovirus 71 and influenza A virus H1N1 (A / PR / 8 / 34), and the antiviral performance of the material was determined based on the virus activity rate 24 hours after virus inoculation. The specific operation scheme refers to the prior art and will not be described in detail here.

[0136] Table 2

[0137]

[0138] Test Example 4

[0139] The hardness and impact toughness of tool materials 1#, 3# and 4# of Example 2 were tested. The test results are shown in Figure 4 It can be seen that the hardness and impact toughness of the above-mentioned tool materials are relatively high, which can meet the actual use requirements.

[0140] The self-corrosion potential test and 72H salt spray test were carried out on the common tool materials 5Cr15MoV, 9Cr18MoV and tool material 5#: the self-corrosion potential test results are shown in Figure 5 , 72H salt spray test results see Figure 6 , Figure 5 The vertical axis corresponding to the horizontal axis is the self-corrosion potential. The higher the self-corrosion potential, the stronger the corrosion resistance. Figure 5 and Figure 6 It can be seen that the corrosion resistance of the tool material 5# prepared in this application is better than that of the commonly used tool materials in the prior art.

[0141] Impact tests were conducted on commonly used materials 9Cr18MoV, 9Cr14MoV, 7Cr17MoV, 5Cr15MoV and tool material 5#. The test results are shown in Figure 7 , Figure 7 The higher the AK value, the better the toughness. It can be seen that the toughness of tool material 5# is better than other tool materials of the same level.

[0142] The above is only the embodiment of the present application, and the protection scope of the present application is not limited by these specific embodiments, but is determined by the claims of the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the technical ideas and principles of the present application should be included in the protection scope of the present application.

Claims

1. A high-strength, high-toughness, long-lasting antibacterial tool material, characterized in that: The tool material is based on Fe and further includes C, Si, S, P, Mn, Cr, Ag, Nb elements and inevitable impurities, wherein the addition amount of the Ag element accounts for 0.01 to 0.2 wt% of the entire material, and the Ag element is uniformly distributed in the tool material; The weight ratio of the Nb element to the C element is 0.008-0.12:1, and the weight ratio of the Cr element to the C element is 10-72:

1.

2. The high-strength, high-toughness, long-lasting antibacterial tool material according to claim 1, characterized in that: The invention also includes a Mo element, and the weight ratio of the Mo element to the Fe element is 0.0001-0.02:

1.

3. The high-strength, high-toughness, durable antibacterial material according to claim 2, characterized in that: The weight ratio of the Mn element to the S element is 200-600:

1.

4. The high-strength, high-toughness, long-lasting antibacterial tool material according to claim 1, characterized in that: The added amount of the Nb element accounts for 0.01-0.03wt% of the entire material.

5. The high-strength, high-toughness, long-lasting antibacterial tool material according to claim 1, characterized in that: The tool material comprises, by weight percentage: C: 0.25-1.2wt%, Si≤0.2wt%, S≤0.001wt%, P≤0.01wt%, Mn: 0.2-0.6wt%, Mo: 0.01-1.5wt%, Cr: 12-18wt%, V: 0-1wt%, Ag: 0.01-0.2wt%, Ti: 0-0.05wt%, Nb: 0.01-0.03wt%, and the rest is iron and inevitable impurities.

6. The method for preparing the high-strength, high-toughness, durable antibacterial tool material according to any one of claims 1 to 5, characterized in that: The steps include: (1) placing the raw materials in a smelting furnace for smelting, and then hot rolling and annealing to obtain a semi-finished product; (2) The semi-finished product is subjected to cold rolling and secondary annealing to obtain a high-strength, high-toughness, and durable antibacterial material.

7. The preparation method according to claim 6, characterized in that: In step (1), Ag and Nb elements are added to the smelting furnace by atomization, specifically: An atomization system is added above the smelting furnace, wherein the atomization system includes a crucible and a blowing device. Ag and Nb elements are placed in the crucible, heated to melt them, and the blowing device is used to blow inert gas to blow the molten Ag and Nb into the smelting furnace.

8. The preparation method according to claim 7, characterized in that: The air blowing device comprises four air supply pipes, and the air supply rate of any air supply pipe is 100L / min to 120L / min.

9. The preparation method according to claim 6, characterized in that: The specific operations of the primary annealing treatment and the secondary annealing treatment are: S1: Heat the material to 570-590℃ and keep it warm for 3h; S2: then raise the temperature to 610-630℃ and keep it for 9h; S3: Heat up to 1240-1260℃ and keep warm for 38h; S4: then cool down to 610-630°C; S5: Finally the air is cooled to room temperature.

10. A cutting tool, characterized in that: It is obtained by processing the high-strength, high-toughness, long-lasting antibacterial tool material according to any one of claims 1 to 5 or the high-strength, high-toughness, long-lasting antibacterial tool material prepared by the preparation method according to any one of claims 6 to 9; The Ag element is evenly distributed in the tool material in the form of ions.

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