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2023-10-11

A Kind of Substitute 304L Dual Phase Steel UR2202

In many applications, it is recommended to replace austenitic materials with cost-effective dual-phase steels, which have at least comparable corrosion resistance and better mechanical properties. For example, UNSS32304(EN 1.4362) may be used to replace 316L(EN 1.4404) in a steamer for a seawater desalination plant; UNSS32305(EN 1.4462) may be used to replace 317LMN(EN 1.4439) in an absorber for a flue gas desulfurization plant. J.Peultier et al. have developed a new cost-effective Mo-free duplex stainless steel UR2202(EN1.4062-X2CrNiN22-2,UNSS32202), which can replace 304L(EN1.4307), cement, organic materials or galvanized carbon steel used in domestic water installations, pipeline industry & paper industry and construction applications. In order to obtain a microstructure with about 50% ferrite and 50% austenite, the reduced Ni is balanced by the addition of N. After preliminary studies on a laboratory scale, mass production was carried out with 22Cr%, 2Ni% and 0.2N% as standard components. This low-Ni, Mo-free steel is less affected by fluctuations in raw material prices than standard austenitic steels. A Cr content of 21.5 or more can make it have better pitting corrosion resistance and uniform corrosion resistance than 304 or 304L, and sometimes can be equivalent to 316 or 316L. Because of the dual phase microstructure and the addition of 0.2% nitrogen, the tensile properties of the steel can be improved to about 2 times that of standard austenitic steel.

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2023-10-11

A Kind of Substitute 304L Dual Phase Steel UR2202

In many applications, it is recommended to replace austenitic materials with cost-effective dual-phase steels, which have at least comparable corrosion resistance and better mechanical properties. For example, UNSS32304(EN 1.4362) may be used to replace 316L(EN 1.4404) in a steamer for a seawater desalination plant; UNSS32305(EN 1.4462) may be used to replace 317LMN(EN 1.4439) in an absorber for a flue gas desulfurization plant. J.Peultier et al. have developed a new cost-effective Mo-free duplex stainless steel UR2202(EN1.4062-X2CrNiN22-2,UNSS32202), which can replace 304L(EN1.4307), cement, organic materials or galvanized carbon steel used in domestic water installations, pipeline industry & paper industry and construction applications. In order to obtain a microstructure with about 50% ferrite and 50% austenite, the reduced Ni is balanced by the addition of N. After preliminary studies on a laboratory scale, mass production was carried out with 22Cr%, 2Ni% and 0.2N% as standard components. This low-Ni, Mo-free steel is less affected by fluctuations in raw material prices than standard austenitic steels. A Cr content of 21.5 or more can make it have better pitting corrosion resistance and uniform corrosion resistance than 304 or 304L, and sometimes can be equivalent to 316 or 316L. Because of the dual phase microstructure and the addition of 0.2% nitrogen, the tensile properties of the steel can be improved to about 2 times that of standard austenitic steel.

2023-10-11

Application of Forging Machinery in Automobile Industry

Since entering the 21st century, China's automobile industry has maintained a momentum of sustained development. Before the 1990 s, the leading product of the domestic automobile industry was trucks. After nearly ten years of development, a gratifying pattern with cars as the leader appeared. The strategic shift of the automobile industry's focus on the development of cars has brought unprecedented development opportunities to the equipment forging industry. In all walks of life, the automobile industry is associated with the equipment manufacturing industry. Relevant data show that more than 50% of American machine tools and more than 60% of industrial robots are used in the automobile industry. Therefore, while the United States has become the kingdom of automobiles, it has also become a major producer of machine tools. The development history of the automobile industry in developed countries proves this point. The development of the automobile industry has promoted the equipment manufacturing industry, especially the machine tool manufacturing industry. The improvement of the machine tool manufacturing industry supports and guarantees the prosperity of the automobile industry in terms of technology and technology. Forging machinery as an important part of the machine tool manufacturing industry and the development of the automobile industry is closely related.

2023-10-11

The Latest Development of Rolling Equipment Research and Development

In order to meet the needs of the shipbuilding industry and the production of large diameter longitudinal welded pipe, Japan, Germany, Russia and other countries have built a number of more than 5 meters of extra-wide plate mill. At present, Japan has been able to produce 5350mm wide and 380mm thick steel plates with a single weight of 200 tons. At present, the newly-built and under construction overseas special wide plate rolling mills of more than 5 meters mainly use single stand form, and the raw materials are large slabs or large steel ingots. Some of them also have roller mill trimming and width control attached to the rolling mills, such as 5490mm vertical roller proximity rolling mills in Japan's Mizushima Factory, 5500mm vertical roller non-proximity rolling mills in Dagu Factory and 5350mm 4830mm vertical roller non-proximity rolling mills in Kashima Factory. In addition, foreign newly-built factories are considering setting up a digital information control cutting line. The main equipment includes a shape meter, an automatic marking machine, a head cutter, a bilateral cutter and a fixed-length cutter, which greatly improves the cutting accuracy. The plate width deviation can be increased from the current 3~8mm to 1~4mm, and the length deviation can be increased from the current 5~10mm to 3~6mm.

2023-10-11

What is the working principle of the flat forging machine?

The working principle of the vertical parting flat forging machine is: when the motor rotates, the crankshaft is driven to rotate through the V-belt, flywheel clutch, transmission shaft, pinion, and large gear, so that the main slider makes a reciprocating linear motion through the connecting rod. While the crankshaft rotates, the cam at the lower end of the crankshaft forces the side slider to move back and forth, and the clamping slider is moved back and forth (clamping or loosening) through the lever. The working sequence of the two sets of mechanisms (upsetting of the punch and clamping of the female die) is that when the clamping slider makes the clamping female die closed, the main slider will carry out upsetting and forging work. When the lifter sends the blank into the corresponding clamping die in turn and clamps the buckle by the die, the main slider is to forge the bar. After forging, the main slider returns, then the clamping die is separated, and the blank completes a deformation step. So reciprocating, the blank in turn through the vertical direction of each die chamber, to complete the corresponding deformation of each work step, to achieve the forging of the blank. The working principle of the horizontal parting flat forging machine is the same as that of the vertical parting flat forging machine. The difference is that the parting plane of the horizontal parting mold is along the horizontal direction, and the mold cavity is also arranged horizontally. Therefore, the operation is more convenient, the realization of mechanization and automation is relatively easy, the body force is also more reasonable.

2022-11-09

Market Situation of Large Forgings in China

At present, China's large forgings market is still under the dual pressure of "surplus" and "shortage". The supply of general large forgings exceeds demand, resulting in price competition; the production capacity of large forgings with high technical content and quality requirements is low or can not be produced, and can only rely on imports. China's imports of large forgings to foreign varieties are mainly power plant forgings (thermal and nuclear power steam turbine Senior high school low-pressure rotor, generator spindle, ring), marine low-speed diesel engine combination crankshaft, roll (large support roll, high requirements of hot-rolled and cold-rolled work roll), part of the high-pressure vessel barrel. The main reasons for users to import are: there are still some problems in domestic smelting technology, which can not meet the requirements of high-quality forgings, long delivery time and high price. The opinion of a steam turbine factory on domestic forging enterprises is that the technology for providing large-capacity steam turbine valves and rotor forgings is not very mature, and the quality and delivery cycle cannot meet the requirements of the project schedule. At present, China has to produce large-capacity supercritical and ultra-supercritical steam turbine forgings, large-capacity nuclear power nuclear island and regular island forgings. The quality requirements of these large forgings are very high. Although China has large-scale smelting equipment and forging equipment, the defect is that the smelting technology is still poor. If this problem is solved, the production of large forgings can be fully localized and exported to the world.

2022-11-09

Development History of Free Forging Hydraulic Press and Large Forgings Production in China

In recent years, domestic large-scale free forging has been in a period of rapid development, especially in 2006, a large-scale free forging equipment investment and construction upsurge was set off all over the country, and large-scale free forging hydraulic presses were launched one after another. According to incomplete statistics, in the two years from 2007 to 2008, there were as many as 5 free forging hydraulic presses with more than 6000 tons to be put into production, while the planned investment and construction reached more than 10. At present, the number of large-scale free forging hydraulic presses in China has ranked first in the world. Does China's free forging industry really need so many large-scale equipment? Is the entire free forging industry in short supply or in excess of demand? Is the investment in free forging equipment blind at this stage...... As early as in 1934, after the Japanese invasion of Northeast China, in Shenyang, Dalian set up machinery factory installed 20MN, 40MN free forging hydraulic press to produce large forgings. After the defeat of Japan in 1945, the forging equipment was removed by friendly forces. By the Chinese own design and manufacture of free forging hydraulic press and the production of large forgings is not long, only 50 years of history. Now review the history of the design and manufacture of free forging hydraulic press and the production of large forgings in China, it is basically divided into the following stages. (Note: When the emulsion and water used in the free forging press are the working liquids, they are called the free forging hydraulic press; when the mineral oil is the working liquid, they are called the free forging hydraulic press, collectively referred to as the free forging hydraulic press. Most of the forging presses imported or manufactured in China before 1990 used emulsion and water as the working liquid. After 1990, the working liquid of the forging press made in China is emulsion and water, and mineral oil is also useful, but most of the imported free forging hydraulic press uses mineral oil. When it is not clear that the free forging press is using that kind of working liquid, it is collectively referred to as a hydraulic press).

2022-11-09

What is the working principle of the flat forging machine?

The working principle of the vertical parting flat forging machine is: when the motor rotates, the crankshaft is driven to rotate through the V-belt, flywheel clutch, transmission shaft, pinion, and large gear, so that the main slider makes a reciprocating linear motion through the connecting rod. While the crankshaft rotates, the cam at the lower end of the crankshaft forces the side slider to move back and forth, and the clamping slider is moved back and forth (clamping or loosening) through the lever. The working sequence of the two sets of mechanisms (upsetting of the punch and clamping of the female die) is that when the clamping slider makes the clamping female die closed, the main slider will carry out upsetting and forging work. When the lifter sends the blank into the corresponding clamping die in turn and clamps the buckle by the die, the main slider is to forge the bar. After forging, the main slider returns, then the clamping die is separated, and the blank completes a deformation step. So reciprocating, the blank in turn through the vertical direction of each die chamber, to complete the corresponding deformation of each work step, to achieve the forging of the blank. The working principle of the horizontal parting flat forging machine is the same as that of the vertical parting flat forging machine. The difference is that the parting plane of the horizontal parting mold is along the horizontal direction, and the mold cavity is also arranged horizontally. Therefore, the operation is more convenient, the realization of mechanization and automation is relatively easy, the body force is also more reasonable.

2022-04-24

Defects of liquid die forgings and countermeasures

The flattened pores under the skin of the workpiece will bulge bubbles on the surface due to thermal expansion when the workpiece is demoulded or heated by heat treatment. The causes are as follows: 1) too much unburned and unvolatilized paint in the concave mold, or poor exhaust from the mold chamber, causing gas generated during pouring to soak into the liquid metal; 2) The extrusion speed is too fast, causing the liquid metal to generate eddy current when filling the mold chamber and involve a large amount of gas; 3) The liquid metal contains too much gas, and the bubbles precipitated before pressurization cannot escape and are squashed under the skin.

2022-04-24

China's forging capacity of large free forgings has reached the world's advanced level

On October 10, the world's Z-sized 18500-ton oil press completed the "big test" in Luoyang and successfully forged 438-ton super-large steel ingots. It indicates that the forging capacity of China's large free forgings has reached the world's advanced level, which will effectively alleviate the urgent need for large forgings in China's electric power, petrochemical, metallurgy, mining, building materials, shipbuilding, aerospace and other fields. it is of great strategic significance to comprehensively enhance the industrial image and ability of China's high-end equipment manufacturing.

2022-04-24

Development Status of Lost Foam Casting Technology in China

In recent years, the lost foam casting process has been used very well in China's foundry industry with its unique advantages. However, there are still some problems in the development of lost foam casting, mainly in the following aspects: 1. The production scale of lost foam foundry is small. 2. Some manufacturers lost lost mold casting quality, casting yield is low, failed to show the advanced nature of this process, seriously affecting the market competitiveness of this new process.

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Contact：Manager Liu


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Contact：Manager Cao

E-mail： tongqing@forgings.net.cn

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