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Performance requirements for cold work die steel

2021/09

Wear resistant alloy steels are classified according to the content of alloy elements

1. According to the content of alloy elements 1) The total content of alloy elements in low alloy steel is less than or equal to 5%; 2) The total content of alloy elements in medium alloy steel is between 5% and 10%; 3) The total content of alloy elements in high alloy steel shall not be less than 10%; 2. Classified according to the types of alloy elements There are chrome steel, manganese steel, chrome manganese steel, chrome nickel steel, chrome nickel molybdenum steel, silicon manganese molybdenum vanadium steel, etc. 3. By main purpose (1) Structural steel 1) Structural steel for building and engineering 2) Structural steel for machine building (2) Tool steel (3) Special performance steel

2021/09

Function of bimetal liner

Function of lining plate: 1. Lifting the grinding medium -- balls and sections 2. For grinding 3. Protect the mill barrel The selection of various lining plates mainly considers the lifting effect on the grinding medium and the running track of the medium. Lining plates are made of chromium molybdenum alloy steel, medium alloy steel, high chromium cast iron, manganese steel, rubber, polyurethane, etc. The shapes are convex, wavy, angular spiral, etc. When mainly crushing, the liner plate is required to have a strong lifting capacity for the grinding body, and the liner plate should have good impact resistance. The high manganese steel ZGMn13 has sufficient impact resistance toughness, but it is not wear-resistant and easy to deform. Now, most of the liner plates have been replaced by bimetallic liner plates. Compared with several wear-resistant materials, the bimetal lining plate has better performance and longer service life.

2021/09

Why is Jiangsu bimetallic liner popular among enterprises?

The base plate of Jiangsu bimetallic liner is made of low carbon steel or low alloy, stainless steel and other ductile materials, reflecting the advantages of bimetallic liner. The wear-resistant layer resists the wear of wear media, and the base plate bears the load of media. Therefore, the bimetallic liner has good impact resistance, and can withstand the impact and wear of high drop in the material conveying system. The reasons why Jiangsu bimetallic liner is popular among enterprises are as follows: 1. Good heat resistance The bimetal composite liner alloy wear-resistant layer is recommended to be used under the working condition of ≤ 600 ℃. If vanadium, molybdenum and other alloys are added to the bimetal liner alloy wear-resistant layer, it can withstand the high-temperature wear of ≤ 800 ℃. The recommended temperature is as follows:; Ordinary carbon steel base plate is recommended to be used under the working condition not higher than 380 ℃; Low alloy heat-resistant steel plate (15CrMo, 12Cr1MOV, etc.) base plate is recommended to be used under the working condition not higher than 540 ℃; The heat-resistant stainless steel substrate is recommended to be used under the working condition not higher than 800 ℃. 2. Good corrosion resistance The alloy layer of Jiangsu bimetallic liner plate contains a high percentage of metal chromium, so it has certain rust prevention and corrosion resistance. It is used in coal chute and hopper to prevent coal sticking. High price performance ratio The bimetal liner plate has a high performance price ratio. Compared with ordinary steel plate, the service life can be increased by more than 10 times, which greatly reduces the maintenance cost and shutdown loss. Therefore, the performance price ratio of bimetal composite lining plate is 3-5 times that of ordinary materials. All kinds and specifications of bimetal wear-resistant plates are complete, and there are many varieties, which have become a series of commodities. The thickness of the wear-resistant alloy layer is 3~20mm, and the thickness of the bimetallic lining plate is 6mm, with unlimited thickness. At present, standard bimetal liner can provide 3000 × 1500mm, can also be customized according to the drawing size according to user requirements. Lining plates are now divided into three types: ordinary type, impact resistant type and high temperature resistant type. Ordering high temperature wear-resistant and impact resistant composite steel plates shall be specified separately. 3. Convenient processing performance Jiangsu bimetallic liner can be cut, bent or curled, welded and drilled. It can be processed into various parts that can be processed by ordinary steel plates. The cut bimetal backing plate can be welded into various engineering structures or parts. It can be welded, has good wear resistance and is widely favored.

2021/09

What is the nature of the mining bimetal composite liner?

The mining bimetallic composite liner has been of different grades and representativeness in the world, but the basic concepts are similar. Let's take a look at the chemical properties of the bimetallic composite liner: The mining bimetallic composite liner has been of different grades and representativeness in the world, but the basic concept is similar Under the technical conditions of the existing enterprise products, the high-strength mining bimetallic composite lining boards are not named in a standardized way. With reference to the standards of foreign companies and the actual situation in China, most of our high-strength bimetallic lining boards are imported brands, and the current use ratio is confusing, so we should adopt grade naming, which should be unified, Promote the use of common standards and development strength bimetallic liner with high promotion specifications for brands, and the high-strength Jiangsu bimetallic liner system GSM. The value of the combination (HB) of the user's bimetallic composite liner plate, Jiangsu bimetallic liner plate brand selection and the use of Pinyin Brinell hardness consistent with the embodiment. The mining bimetallic composite liner construction machinery is generally made of traditional high manganese steel. Although high manganese steel is strengthened, it has a strong hardening ability under impact stress in future use. It can only play a large impact load in its role, and the wear resistance under the impact condition of small load cannot be improved by hardness and hardening of high manganese steel. The yield strength is not high, and the workpiece can also crack under a large force, It is difficult to achieve the required service life. Therefore, compared with high manganese steel, in recent years, low alloy is used to produce small and medium-sized bimetallic composite liner mechanical parts, which can be applied in the field of mechanical engineering. The high manganese steel used in the extension and expansion is recognized by the mechanical industry and has become a trend.

2021/09

How about the wear resistance of bimetal composite liner?

Wear resistance of bimetal composite liner: The bimetallic composite liner is now used in many cement plants, power plants and other enterprises, and the wear resistance of the bimetallic liner has been recognized and loved by these enterprises. However, there is no unified standard and clear statement on how to evaluate the wear resistance of Jiangsu bimetal liner, and it is always in a vague state. It is complicated to evaluate the wear resistance of bimetallic liner. At present, the practice of peers is to test the surface hardness of the wear layer, and it is believed that the higher the surface hardness, the better the wear resistance. The identifications of surface hardness values are also inconsistent. They are represented by Rockwell hardness (HRC), Vickers hardness (HV), and British Brinell hardness (HB), which are confusing and easy to create illusion and confusion for users. Hardness is the ability of a metal material to resist the pressure limiting surface of a hard object. The hardness can partly reflect the wear resistance of metal materials, but it is unscientific and one-sided to indicate the wear resistance of metal materials completely according to the hardness, which cannot comprehensively reflect the wear resistance of the wear layer. This paper can comprehensively analyze and evaluate the wear resistance of the bimetal composite liner through the following aspects: 1. Macro Rockwell (HRC) hardness value; 2. Metallographic structure: Metallographic analysis can clearly show the type, quantity, shape, size and distribution of carbides; it can also analyze the basic type composition. It is an important basis for analyzing and evaluating wear resistance. 3. Microhardness (HV) Test the microhardness value of matrix and carbide; 4. Wear amount is measured by wear tester; The wear test shall be conducted by imitating the actual working conditions to test the weight loss or relative wear resistance. Through the above four aspects of test analysis and comprehensive evaluation of Jiangsu bimetal liner, the wear resistance of bimetal composite liner can be basically evaluated.

2021/09

What are the factors affecting the corrosion of Jiangsu bimetal liner?

The selection of wear-resistant and anti-corrosion pipes and equipment is particularly important, which completely solves the problems of wear-resistant and anti-corrosion in the chemical industry, such as running, emitting, dripping and leaking. The following is a brief introduction to the use of Jiangsu bimetal liner in the chemical industry. 1、 Reasons for corrosion damage of Jiangsu bimetal liner: 1. Overtemperature and overpressure during operation, imperfect equipment management and careless thinking are also the main reasons for corrosion. 2. There are many corrosive media in chemical production, such as acid, alkali, salt, water, oxygen, etc., which is one of the main reasons for corrosion. 3. The unreasonable layout design, improper material selection, low manufacturing and processing quality, surplus welding, lack of anti-corrosion methods or poor construction quality of the bimetal composite liner provide an environment for corrosion damage. 2、 Connotative elements of corrosion damage of Jiangsu bimetal liner: 1. The rougher the appearance of the parts, the more likely they are to corrode. If the surface has oxide film, it is corrosion resistant. 2. Different metals have different corrosion resistance abilities with respect to different media. 3. Metal corrosion is fast at the places where the shape of equipment layout changes suddenly, such as openings, gaps or dead corners. 4. The coarser the metal grains, the faster the corrosion. On the contrary, the slower it is, for example, stainless steel has higher corrosion resistance than cast iron. 3、 Jiangsu bimetallic liner plate constitutes the external elements of corrosion damage: 1. The greater the external force or residual stress on the components of the bimetal composite liner, the faster the corrosion. 2. The type, chemical composition, concentration, pH value, impurities, moisture and oxygen content of the medium are the external causes of corrosion. 3. The faster the medium moves, the more likely it is to corrode. It will erode the protective film, causing vortex, turbulence and cavitation, leading to severe impact wear and cavitation corrosion. 4. Stress and fatigue. On the one hand, the occurrence of equipment stress is formed during processing, such as the deformation stress of cold processing and the arrangement stress of hot processing; On the other hand, the parts subject to pressure or rotation in the work will also cause stress. The effect of these stresses will lead to the internal distortion of the bimetallic composite liner, thus reducing the electrode potential of this part and aggravating the corrosion of the micro battery. 5. The higher the temperature and pressure of the medium, the faster the corrosion. As corrosion is a chemical reaction, the corrosion rate will be increased by 1-3 times for every 15% temperature rise. With the increase of temperature, the dispersion speed increases, and the resistance of electrolyte decreases, so the reaction of corrosive battery is accelerated. Jingjiang Yongxin Special Steel Co., Ltd. specializes in the production of bimetallic liner, mainly engaged in: Jiangsu bimetallic liner, bimetallic composite liner, rod mill liner, mining bimetallic composite liner, ball mill bimetallic composite liner, rod mill bimetallic composite liner, rod mill bimetallic liner, semi-automatic mill liner, super large ball mill bimetallic composite liner and other products. Welcome to consult and cooperate!

2021/09

What is the effect of high pressure deformation on bimetal composite liner?

High pressure deformation mainly by hydrostatic extrusion can improve the strength and plasticity of bimetal composite liner alloy at the same time, and reduce the brittle plastic transition temperature. These performance improvements may even be retained in subsequent processes. The research on the influence of high pressure deformation on the performance of Jiangsu bimetal liner is introduced. The research of various countries shows that the research situation and various mechanisms proposed by various countries to explore the reasons for high pressure deformation to improve the performance of bimetal liner materials are summarized. The mechanism of high pressure deformation on defect healing and the mechanism of dislocation pressure multilateralization proposed by Soviet scholars are first proposed. For the manufacture of bimetallic composite liner systems with a diameter of less than 10 microns, the traditional method of drawing by mold is difficult. The electrolytic corrosion method, which was successfully researched in the 1950s and then widely used, is effective in this case. Now, tungsten and tungsten rhenium bimetallic liner alloy (grades BAP5 and BP20) microfilaments with a diameter of 5-10 μ m have been prepared in batches by the above method, and the filaments with a diameter of 3-5 μ m have been prepared under laboratory conditions. The possibility of obtaining molybdenum and molybdenum rhenium alloy fine wires for lining plate was determined. The following technical data are the characteristics of industrial bilateral equipment for obtaining microfilaments with a diameter of 5-15 μ m by electrolytic corrosion. The purpose of improving the high temperature resistance of bimetal composite liner material is to meet the requirements of engine valves, turbine blades and rocket engine materials. A California researcher applied the coating method to retain the strength of the metal corresponding to half the melting point of the refractory metal. The metal used for lining plate is a series of electroformed refractory metals, including nickel, nickel drill and nickel manganese. The specific process is: adding particles with a diameter less than 1 μ M, such as thorium oxide or zirconia mixture as coating material. The proposal of the task When developing a thermionic diverter that converts flame heating directly into electrical energy, various possible bimetallic composite liner materials were studied. The results show that nickel base superalloy and more Jiangsu bimetal liner iron base alloys can meet the requirements of corrosion resistance, but their strength is not enough. In this regard, dispersion strengthened nickel based alloys or iron based alloys are slightly better.

2021/09

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