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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.

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.

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Contact：Manager Liu


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Contact：Manager Cao

E-mail： tongqing@forgings.net.cn

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