Special grinding wheel for high-speed cold cutting of nuclear power stainless steel materials

Abstract

An embodiment of the present application provides a special grinding wheel for high-speed cold cutting of nuclear power stainless steel materials, wherein the raw materials of the grinding wheel include: mixed abrasive, adhesive, filler and reinforcing material, wherein the mixed abrasive includes single crystal corundum and microcrystalline alumina; the adhesive includes phenolic resin powder and phenolic resin liquid; the filler includes potassium fluoroaluminate, magnesium oxide, ferrous disulfide, potassium sulfate, and gypsum; the reinforcing material includes glass fiber mesh; the weight ratio of each raw material of the grinding wheel is: 100 parts of mixed abrasive, 30-36 parts of adhesive, and 25-40 parts of filler.

Description

Technical Field

[0001] The present application belongs to the field of abrasive tool technology, and specifically relates to a high-speed cold cutting special grinding wheel suitable for nuclear power stainless steel materials, and more specifically relates to a high-speed cold cutting special grinding wheel suitable for nuclear power 1Cr18Ni9Ti stainless steel materials. Background Art

[0002] Early nuclear power facilities used 1Cr18Ni9Ti (formerly 321 steel) stainless steel for steel cladding, such as hot rooms, glove boxes, large tanks, equipment rooms, and spent fuel pool linings. While this stainless steel exhibits excellent weldability, it is susceptible to work hardening and can cause severe tool sticking during cold cutting, making it a typically difficult-to-cut and difficult-to-machine austenitic stainless steel. During the decommissioning process of nuclear facilities, the removal of this stainless steel requires high-speed cutting machinery to minimize worker radiation exposure due to its high radioactive contamination.

[0003] However, most of the current domestic stainless steel grinding wheel cutting blades are only suitable for normal or slow speed cutting under manual operation. In addition, the cutting blades have relatively low cutting consumption, are consumed quickly, and have a short service life. In actual use, a large amount of cutting dust is generated and the cutting blades need to be frequently replaced. The above shortcomings are more obvious under high-speed cutting conditions, and there are even cases where the grinding wheel cutting blade cannot be cut and is scrapped. During the cutting operation of materials containing radioactive materials, these existing stainless steel grinding wheel cutting blades are prone to generating a large amount of cutting blades, cutting dust and radioactive solid waste. The spread of a large amount of cutting dust increases the risk of radioactive contamination and the risk of contamination of personnel's body surfaces. In addition, the frequent replacement of new cutting blades by personnel can easily make the cutting machine unable to operate continuously for a long time, reducing the efficiency of cutting construction and increasing the risk of excessive radiation exposure to personnel.

[0004] The existing stainless steel cutting grinding wheel is not suitable for the high-speed cutting of austenitic stainless steel materials for decommissioning nuclear facilities. Therefore, a new grinding wheel is urgently needed to meet the high-speed cutting requirements of stainless steel materials for decommissioning nuclear facilities. Summary of the Invention

[0005] In view of the above problems, the present application is proposed to provide a high-speed cold cutting special grinding wheel suitable for nuclear power stainless steel materials that overcomes the above problems or at least partially solves the above problems.

[0006] According to the first aspect of the embodiment of the present application, a special grinding wheel for high-speed cold cutting of nuclear power stainless steel materials is provided, wherein the raw materials of the grinding wheel include: mixed abrasive, adhesive, filler and reinforcing material, wherein: the mixed abrasive includes single crystal corundum and microcrystalline alumina; the adhesive includes phenolic resin powder and phenolic resin liquid; the filler includes potassium fluoroaluminate, magnesium oxide, ferrous disulfide, potassium sulfate, and gypsum; the reinforcing material includes glass fiber mesh; wherein the weight ratio of each raw material in the grinding wheel is: 100 parts of mixed abrasive, 30-36 parts of adhesive, and 25-40 parts of filler.

[0007] The special grinding wheel for high-speed cold cutting of nuclear power stainless steel materials provided in the embodiment of the present application uses single crystal corundum and microcrystalline corundum as abrasives for the grinding wheel, which can make the prepared grinding wheel have high strength, toughness and self-sharpening properties. At the same time, the addition of auxiliary materials such as potassium fluoroaluminate, ferrous disulfide, potassium sulfate, etc. in the process of making the grinding wheel can enhance the sharpness, structural strength, stability and lubricity of the grinding wheel, as well as reduce frictional heat, so that the prepared grinding wheel can be used for high-speed cutting of nuclear power stainless steel materials, and the consumption of the grinding wheel cutting disc is small during the cutting process, that is, less powder is generated. In addition, the raw materials of the grinding wheel formula in the embodiment of the present application are moderately priced, easily available, and non-specific, meeting the requirements of industrial production. DETAILED DESCRIPTION

[0008] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiment is only one embodiment of this application, not all embodiments. Based on the described embodiments of this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0009] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. If the full text involves descriptions such as "first" and "second", the "first" and "second" descriptions are only used to distinguish similar objects, and cannot be understood as indicating or implying their relative importance, order of precedence, or implicitly indicating the number of technical features indicated. It should be understood that the data described by "first" and "second" can be interchangeable under appropriate circumstances. If "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes Solution A, Solution B, or solutions that meet both A and B.

[0010] When cutting and dismantling stainless steel during the decommissioning of nuclear facilities, due to its serious radioactive contamination, cutting machinery and equipment with a higher cutting speed are required to reduce the radiation dose to the workers.

[0011] Although thermal cutting processes such as plasma ablation have a high cutting speed for austenitic stainless steel, they are only suitable for cutting operations in closed environments such as hot chambers. When using thermal cutting processes to cut materials that are severely contaminated with radioactivity in open or semi-open environments, the large amount of radioactive aerosols generated can easily cause pollution to the surrounding environment and pose a risk of inhalation of radioactive substances to workers; at the same time, the high-temperature aerosols generated by thermal cutting can burn the filter core material, causing penetration of the ventilation and filtration system, thereby causing radioactive aerosol environmental pollution on a larger scale. In addition, when cutting this type of stainless steel underwater, the large number of bubbles generated by the thermal cutting technology will significantly reduce visibility in the water, making the cutting operation more difficult and difficult to cut accurately and effectively. Therefore, in view of the problems existing in thermal cutting processes such as plasma ablation, it is appropriate to use cold cutting processes, that is, ordinary mechanical cutting, for this type of stainless steel material.

[0012] When using cold cutting technology to cut stainless steel, since stainless steel equipment is intact before being cut and dismantled, cold cutting requires the material to be cut through the steel plate surface before the cut is completed. However, current cold cutting materials such as specialized grinding wheels, saw blades, and diamond cutting blades for stainless steel cutting have been tested and found to only be able to cut through the steel plate surface, with the exception of a few types of grinding wheels. These saw blades and diamond cutting blades are unable to cut through the entire surface.

[0013] The current performance defects of stainless steel-specific grinding wheel cutting discs in nuclear facility decommissioning projects are mainly manifested in the imbalance between grinding wheel sharpness and durability under high-speed cutting conditions. Stable high-speed cutting requires the cutting material to have high cutting performance. From the grinding cutting mechanism, it can be seen that high cutting performance and long service life of the grinding wheel are contradictory. The cutting performance of the grinding wheel is derived from the strength and toughness of the abrasive and the self-sharpening property of the grinding wheel structure. The self-sharpening property of the grinding wheel is the ability of the abrasive to fall off the grinding wheel structure to produce a fresh cutting edge, thereby maintaining the sharpness of the grinding wheel. If the grinding wheel service life is longer and the cutting loss ratio is greater, that is, the abrasive grains of the grinding wheel are not easy to fall off the grinding wheel structure, its self-sharpening property will inevitably decrease.

[0014] To this end, the present application provides a formula for a special grinding wheel for high-speed cold cutting of nuclear power stainless steel materials, so that the grinding wheel cutting blade prepared using the formula provided in the embodiment of the present application has the characteristics of fast cutting speed, long service life, and small amount of cutting dust generated. It can meet the requirements of cutting material performance and radiation protection when using cold cutting technology for radioactively contaminated stainless steel materials in nuclear facility decommissioning.

[0015] The technical solution provided in this application is as follows: a special grinding wheel suitable for high-speed cold cutting of nuclear power stainless steel materials, wherein the grinding wheel raw materials include: mixed abrasive, adhesive, filler and reinforcing material.

[0016] Typical grinding wheel fillers include pyrite, cryolite, and light calcium carbonate. To improve the grinding performance of the grinding wheel, the mixed abrasive in the embodiments of this application includes single-crystal corundum and microcrystalline alumina (SG abrasive). Single-crystal corundum offers high strength and toughness, which can compensate for the lack of edge strength of SG abrasive at high depths of cut. SG abrasive particles, compared to ordinary corundum particles, have higher hardness, toughness, and sharpness. They also self-sharpen during wear, eliminating the need for abrasive particles to detach from the grinding wheel structure. This results in a longer service life for the resulting grinding wheel.

[0017] The adhesive is one of the key components of the grinding wheel. The adhesive in the embodiment of the present application includes phenolic resin powder and phenolic resin liquid. Its main function is to fix the abrasive particles into one body to form a grinding wheel to help it achieve the grinding function.

[0018] The fillers used in the examples of this application include potassium fluoroaluminate, magnesium oxide, ferrous disulfide, potassium sulfate, and gypsum. Potassium fluoroaluminate has a relatively high melting point (546°C) and serves primarily as a stabilizer and wear-resistant additive for the grinding wheel. It lubricates at high temperatures, reduces frictional heat, and releases fluorine, which promotes metal bond breakage and improves the sharpness of the grinding wheel.

[0019] Magnesium oxide can promote high-temperature hardening of resin, shorten the hardening time of grinding wheel, allow the resin to fully react at the reaction temperature point, and reduce the emission of volatile fillers during the hardening process; as well as maintain the tissue bonding strength of the grinding wheel at higher temperatures.

[0020] Ferrous disulfide reacts with the steel during grinding through the sulfur released during the baking process, protecting the grinding wheel surface, reducing frictional heat, lubricating, improving the grinding efficiency of the grinding wheel, stabilizing the working efficiency of the grinding wheel, and improving high-temperature decay performance. It can also promote chip oxidation and reduce the amount of sparks generated during cutting by utilizing the properties of absorbing oxygen at low heat, absorbing heat at medium heat, and lubricating at high heat.

[0021] Potassium sulfate increases the porosity of the grinding wheel and improves its heat dissipation. The sulfate ions released at high temperatures also promote the breaking of metal bonds, increasing the sharpness of the grinding wheel. Furthermore, adding potassium sulfate, ferrous disulfide, and potassium fluoroaluminate to the mixed abrasive prevents carbonization and burning of phenolic resin at high temperatures, helping to maintain the strength and stability of the grinding wheel and effectively extending its service life.

[0022] Gypsum, an inert filler, improves and maintains the structural strength of the grinding wheel.

[0023] Reinforcement materials include glass fiber mesh, which can enhance the overall mechanical strength of the grinding wheel.

[0024] In the embodiment of the present application, the weight ratio of each raw material in the grinding wheel is: 100 parts of mixed abrasive, 30-36 parts of adhesive, and 25-40 parts of filler.

[0025] Among them, the weight proportion of single crystal corundum is 25-35 parts; the weight proportion of microcrystalline alumina is 65-75 parts; the weight proportion of phenolic resin liquid is 13.9-16.9 parts; the weight proportion of phenolic resin powder is 16.1-19.1 parts; the weight proportion of potassium fluoroaluminate is 11-14 parts; the weight proportion of magnesium oxide is 2-5 parts; the weight proportion of ferrous disulfide is 7-10 parts; the weight proportion of potassium sulfate is 3-6 parts; and the weight proportion of gypsum is 2-5 parts. The total weight fraction of the mixed abrasive particles of single crystal corundum and microcrystalline alumina remains unchanged at 100 parts.

[0026] Furthermore, the weight proportion of single crystal corundum is 30 parts; the weight proportion of microcrystalline alumina is 70 parts; the weight proportion of phenolic resin liquid is 14.9 parts; the weight proportion of phenolic resin powder is 17.1 parts; the weight proportion of potassium fluoroaluminate is 12 parts; the weight proportion of magnesium oxide is 3 parts; the weight proportion of ferrous disulfide is 8 parts; the weight proportion of potassium sulfate is 4 parts; and the weight proportion of gypsum is 3 parts.

[0027] In the embodiments of the present application, the use of single crystal corundum and microcrystalline corundum as abrasives for the grinding wheel can make the prepared grinding wheel have higher strength, toughness and self-sharpening properties. At the same time, the addition of auxiliary materials such as potassium fluoroaluminate, ferrous disulfide, potassium sulfate, etc. in the process of making the grinding wheel can enhance the sharpness, structural strength, stability, lubricity of the grinding wheel, and reduce frictional heat, so that the prepared grinding wheel can be used for high-speed cutting of nuclear power stainless steel materials, and the grinding wheel consumption is small, that is, less powder is generated.

[0028] In some embodiments, the microcrystalline alumina includes coated microcrystalline alumina. By coating the surface of the SG abrasive, the abrasive grains of the grinding wheel are prevented from falling off during the first few seconds of cutting, thereby increasing the life of the grinding wheel.

[0029] In some embodiments, the grit size of single-crystal corundum abrasive is 50#-60#; the grit size of microcrystalline alumina is 45#-55#. Single-crystal corundum with a grit size of 60# and coated SG abrasive with a grit size of 54# are preferred. Using finer grit abrasive in grinding wheels with higher structural hardness can reduce the chance of the abrasive being completely blunted and dislodged due to collision with the cut steel during high-speed cutting, thereby extending the life of the grinding wheel.

[0030] In some embodiments, the phenolic resin liquid includes phenolic resin liquid 2556#, and the phenolic resin powder includes phenolic resin powder 2816#. The adhesive used in this application is a high-quality phenolic resin adhesive commonly used in the abrasive manufacturing industry. Other types of high-quality adhesives may also be used, and are not limited here.

[0031] In some embodiments, the fiberglass mesh is double-layered, containing greater than or equal to 30% resin glue. The reinforcement mesh used in this application is a high-quality reinforcement mesh commonly used in the abrasive tool manufacturing industry. The use of a double-layer fiberglass mesh can improve the overall mechanical strength of the grinding wheel, enhance cutting safety, and confine the spread of cutting dust to a narrow range, reducing the risk of contamination and facilitating collection. This can effectively reduce the risk of radioactive dust inhalation by workers using the grinding wheel to cut nuclear equipment.

[0032] In some embodiments, the grinding wheel has a hardness of T grade, and the abrasive of the prepared grinding wheel is not easy to fall off, thereby extending the service life of the grinding wheel. The grinding wheel has a density of 5, which is the density of a conventional stainless steel cutting grinding wheel.

[0033] In some embodiments, the grinding wheel is suitable for cutting 1Cr18Ni9Ti stainless steel, and is also suitable for other types of stainless steel, such as austenitic, martensitic, and carbon steel, achieving better cutting results. Furthermore, the grinding wheel blades prepared using the formulations described in the embodiments of this application have a service life 2 to 10 times longer than existing stainless steel-specific grinding wheel blades of the same specification, depending on the thickness of the stainless steel plate being cut.

[0034] For example, a stainless steel grinding wheel is prepared by using 30 parts by weight of 60# single crystal corundum, 70 parts by weight of 54# coated SG abrasive, 14.9 parts by weight of phenolic resin liquid, 17.1 parts by weight of phenolic resin powder, 12 parts by weight of potassium fluoroaluminate, 3 parts by weight of magnesium oxide, 8 parts by weight of ferrous disulfide, 4 parts by weight of potassium sulfate, and 3 parts by weight of gypsum, and a double-layer glass fiber mesh containing greater than or equal to 30% resin glue is used, and the grinding wheel is used in When cutting 1Cr18Ni9Ti stainless steel materials with a thickness of less than or equal to 8mm, the grinding wheel can achieve a cutting speed of 5-300m / h, and the grinding wheel's cutting loss ratio is greater than or equal to 6, so that the grinding wheel cutting blade has the characteristics of fast cutting speed, long service life, and low cutting dust generation. It can meet the cutting performance and safety requirements for stainless steel materials during the cold cutting process of radioactively contaminated stainless steel materials in nuclear facility decommissioning. The grinding wheel's cutting loss ratio is the ratio of the weight of stainless steel material removed by cutting to the weight of grinding loss by the grinding wheel.

[0035] Furthermore, the cutting speed of the abrasive cutting disc provided by the embodiments of the present application is applicable over a wide range, including high-speed mechanical cutting in track-oriented and robotic-arm-oriented conditions. For the same steel plate thickness (within the applicable cutting range of the abrasive wheel in the embodiments of the present application), the cutting speed of the abrasive wheel provided by the embodiments of the present application is comparable to or higher than that of plasma ablation cutting. The abrasive wheel provided by the embodiments of the present application is also applicable to manual cutting, significantly reducing the labor intensity of manual cutting.

[0036] The grinding wheel provided in the embodiment of the present application also has a higher cutting consumption ratio, which can extend the service life of the grinding wheel, that is, the number of grinding wheel cutting discs used to cut a unit length of steel plate is less, which can significantly reduce the frequency of manual replacement of cutting materials, and significantly improve the cutting smoothness under mechanical cutting conditions. Under radioactive operating conditions, by reducing the frequency of workers replacing cutting materials, the frequency of workers contacting radioactive materials is reduced, thereby reducing the contamination of the personnel's body surface and radiation exposure, and shortening the cutting operation time, so as to achieve the effect of maximizing radiation protection. At the same time, the use of fewer grinding wheel cutting discs can significantly reduce the amount of cutting dust and waste grinding wheels generated, thereby reducing the amount of radioactive solid waste generated, and narrowing the diffusion range of cutting dust, which is beneficial to environmental protection during radioactive cutting operations and reducing the level of respiratory protection for workers. In the embodiment of the present application, the measured TSP background of the test site is 3mg / m 3 During the cutting process, the TSP concentration in the workplace air, PC-TWA, was 3.01 mg / m 3 , PC-STEL is 12.24 mg / m 3 It can obviously meet the requirements of national standards. According to GBZ2.1-2007 "Occupational exposure limits of harmful factors in the workplace Part 1: Chemical harmful factors", the PC-TWA limit of total dust TSP of grinding wheel dust is 8mg / m 3 , PC-STEL limit is 16mg / m 3 In addition, the grinding wheel provided in the embodiment of the present application has a high cutting sharpness and can smoothly complete the operation of cutting through the surface of the steel plate to form an incision, and is suitable for working conditions where stainless steel equipment has high integrity and no fractures.

[0037] The following is a further explanation of the technical solution of the present application in conjunction with specific embodiments. It should be noted that the examples listed are only used to explain the present application and are not intended to limit the scope of the present application. The specific weight ratios of the raw materials in the special grinding wheel for high-speed cold cutting of nuclear power stainless steel materials are as follows:

[0038] 60# single crystal corundum is 30 parts, 54# coated SG abrasive is 70 parts, phenolic resin liquid 2556# is 14.9 parts; phenolic resin powder 2816# is 17.1 parts; potassium fluoroaluminate is 12 parts; magnesium oxide is 3 parts; ferrous disulfide is 8 parts; potassium sulfate is 4 parts; gypsum is 3 parts, and a double-layer glass fiber mesh containing ≥30% resin glue is used as the reinforcing material. The grinding wheel model prepared according to the formula in the embodiment of this application is: 41-SG54T5BF2.

[0039] The grinding wheel of the present embodiment can obtain a product that meets the performance requirements by using the conventional process flow and process parameters for producing cutting grinding wheels in the abrasive tool manufacturing industry, which will not be described in detail here.

[0040] During the cutting process using the grinding wheel, a programmable speed-controlled grinding wheel orbital cutting machine was used for the cutting experiment (i.e., cold cutting process). The cutting parameters are shown in Table 1. Each experiment used 100 grinding wheels of corresponding specifications, and each wheel completed one incision.

[0041] Table 1. General cutting process parameters for steel cladding stripping

[0042]

[0043] Before the experiment began, a flat surface was selected, steel bars were embedded, and a concrete floor was prepared. Spot welding and anchor bolts were used to secure 1 m × 2 m 1Cr18Ni9Ti stainless steel plates, one 3 mm thick and one 6 mm thick. The materials and installation methods used were the same as for the steel cladding peeling test specimens, meeting the requirements of a typical simulated environment. Before cutting, the grinding wheel thickness was measured with a caliper. The grinding wheel was weighed and recorded before and after cutting. The cutting loss ratio was calculated using the formula (1):

[0044]

[0045] Among them, L 切 —Cutting length: 300mm for 115# grinding wheel and 240mm for 180# grinding wheel; 钢 —Steel density: the density of 1Cr18Ni9Ti stainless steel is 7.85g / cm 3 ;

[0046] δ 钢 —Thickness of steel plate, 3mm or 6mm;

[0047] f 切 —Incision width, based on grinding wheel thickness, mm;

[0048] w 砂轮0 —Mass of grinding wheel before cutting, g;

[0049] w 砂轮1 —Mass of grinding wheel after cutting, g.

[0050] Calculation of cutting loss ratio: Due to the end face runout of the grinding wheel and the error of the cut alignment, the actual cut is slightly larger than the grinding wheel thickness, that is, the actual cutting loss is slightly higher than the calculated cutting loss ratio. The cutting loss ratios of steel plates of different thicknesses obtained according to the parameters in Table 1 are shown in Table 2:

[0051] Table 2. Statistics of cutting loss ratio in mass production experiments

[0052]

[0053] As can be seen from Table 2, the grinding wheel cutting disc prepared according to the formula provided in the experiment of this application is used to cut 1Cr18Ni9Ti stainless steel plates of different thicknesses under different grinding wheel specifications. The average cutting loss ratio of the obtained grinding wheel is greater than 6, indicating that it produces less powder, which can reduce the volatilization of powder and harm to the human body.

[0054] Furthermore, a grinding wheel prepared with this formula was subjected to an attenuation test equivalent to 1.4 years of storage at room temperature and constant humidity, and the reduction in cutting loss ratio was 10% to 70%. Furthermore, because the grinding wheel prepared with the formula provided in the examples of this application has a high cutting speed (5-300 m / h) and can operate normally even in an irradiation environment of 20 mSv, it can effectively reduce the frequency of workers' exposure to radioactive waste and shorten cutting operation time, thereby reducing body contamination and radiation exposure to personnel, and can achieve the maximum radiation protection effect.

[0055] The above embodiments describe the present invention in detail. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Any content not described in detail in the present invention may be adapted from existing technologies.

Claims

1. A high-speed cold cutting grinding wheel suitable for nuclear power stainless steel materials, the grinding wheel raw material comprising: Mixed abrasive, binder, filler and reinforcing material, characterized in that, The mixed abrasive comprises single crystal corundum and microcrystalline aluminum oxide; The adhesive comprises phenolic resin powder and phenolic resin liquid; The filler includes potassium fluoroaluminate, magnesium oxide, ferrous disulfide, potassium sulfate, and gypsum; The reinforcing material includes a glass fiber mesh; The weight ratio of the raw materials in the grinding wheel is: 100 parts of mixed abrasive, 30-36 parts of adhesive, and 25-40 parts of filler; The weight portion of the single crystal corundum is 25-35 parts; The weight portion of the microcrystalline alumina is 65-75 parts; The weight parts of the phenolic resin liquid are 13.9-16.9 parts; The weight proportion of the phenolic resin powder is 16.1-19.1 parts; The weight parts of the potassium fluoroaluminate are 11-14 parts; The weight portion of the magnesium oxide is 2-5 parts; The weight portion of the ferrous disulfide is 7-10 parts; The weight parts of the potassium sulfate are 3-6 parts; The weight portion of the gypsum is 2-5 parts; The microcrystalline alumina includes coated microcrystalline alumina; The particle size of the single crystal corundum abrasive is: 50#-60#; The particle size of the microcrystalline alumina is 45#-55#.

2. The grinding wheel according to claim 1, characterized in that The phenolic resin liquid includes: phenolic resin liquid 2556#; The phenolic resin powder includes: resin powder 2816#.

3. The grinding wheel according to claim 2, characterized in that The glass fiber mesh is double-layered, wherein the double-layer glass fiber mesh contains greater than or equal to 30% of resin glue.

4. The grinding wheel according to claim 1, wherein The grinding wheel is suitable for 1Cr18Ni9Ti stainless steel material.

5. The grinding wheel according to claim 4, characterized in that When the grinding wheel is cutting 1Cr18Ni9Ti stainless steel material with a thickness less than or equal to 8 mm, the cutting speed of the grinding wheel can reach 5-300 m / h.

6. The grinding wheel according to claim 4, characterized in that The cutting loss ratio of the grinding wheel is greater than or equal to 6, wherein the cutting loss ratio of the grinding wheel is the ratio of the weight of the stainless steel material cut and removed to the weight of the grinding wheel grinding loss.

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