Performance requirements for cold work die steel

Performance requirements for cold work die steel

Fracture resistance One time brittle fracture resistance: the indicators that can characterize the one-time brittle fracture resistance are the first impact fracture work, compressive strength and bending strength. The above indexes can reflect the breaking resistance of the punch under overload. Fatigue fracture resistance: It is characterized by the number of fracture cycles displayed under a certain cyclic load or the load value that causes the sample to fracture under a specified number of cycles. It can be reflected by several indicators, such as small energy multiple impact fracture work or multiple impact fracture life, tension compression fatigue strength or fatigue life, contact fatigue strength or contact fatigue life. Crack fracture resistance: when there are microcracks in the mold, the fracture resistance is greatly reduced. Therefore, the fracture resistance of the cracked body can not be evaluated by various fracture resistances measured by smooth specimens. According to the theory of fracture mechanics, the fracture toughness index can be used to characterize the fracture resistance of crack bodies.

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2018

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03

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

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

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2018

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03

Function of bimetal liner

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.

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2018

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03

Why is Jiangsu bimetallic liner popular among enterprises?

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 lining 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.

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2020

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04

What is the nature of the mining bimetal composite liner?

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 existing enterprise products, the high-strength mining bimetallic composite lining plate is not the standard brand Drawing on the standards of foreign companies and the actual situation of our country, the achievements of our high-strength bimetallic linings are mostly imported brands. The current use is confusing. We should adopt the naming of grades and unify them. We should promote the use of common standards and the development of high-strength bimetallic linings with high promotion standards, and the high-strength Jiangsu bimetallic lining 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.

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2020

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04

How about the wear resistance of bimetal composite liner?

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.

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