The influence of the jb'issrfi9 sub-mt on the precipitation regularity and mechanical properties of the second phase particles of high-strength % steel (Continued from page 43) (2) China has not yet adopted the process of rolling and rolling medium-thick steel plate construction and transformation of rolling mills. The unsuccessful factors of using the furnace rolling mill of Taigang and Shougang, as well as the superiority of the new-generation furnace rolling mill and the roll-rolling medium-thick steel plate process, the current 2300mm medium-plate mill yield in China is only 86%. Or slightly higher, such as the use of new technology, wide slab continuous casting machine and a new generation of furnace rolling mill can achieve a yield of about 96%, which will have huge economic benefits, it is worth promoting after the pilot practice.
(3) The combination of the furnace rolling mill and the medium-thickness slab continuous casting to form a medium-thick slab continuous casting and rolling production line to produce medium-thick steel plates has two advantages. It is recommended to choose a construction site in China.
Baotou Steel will build steel pipe production line Baotou Iron and Steel Co., Ltd. has signed a contract with German SMSMeer Company to order a set of mandrel-type seamless steel tube rolling mill. At the same time, German side will also provide steel pipe straightening machine, chamfering machine, eddy current testing device and hexagonal bundling. Machines and electrical control systems for production lines.
The production line is used to produce high-precision seamless pipes with a diameter of 60~180mm. The annual output is about 1.15 million tons. It is expected to be completed and put into production in 2001. The production line will make the noise at the peak of production extremely small, the shortest rule, the minimum tool replacement time, and leave room for the construction of the second production line in the design. Zhang Qing high-frequency welding light H-beam is a new type of economy. Section steel, 1997, Shanghai Datong Steel Structure Co., Ltd. introduced the first high-frequency welding light H-beam production line from the United States, with an annual production capacity of 60,000 tons. The product fills a gap in China's high-tech building materials and replaces imports. . The high-frequency welding light H-beam has superior cross-section performance, economical specifications, easy processing and low application cost. At present, the company's high-frequency welding light H-beam has been included in the national key new products.
Zhang An Germany's Ispartrurol Special Steel Company's Billet High-speed Continuous Casting Technology A new six-flow high-speed special steel billet continuous casting machine from Ispartrurol Special Steel Company, Germany, in March 1998 It was put into production on the 14th. The project was designed, supplied and installed by the Italian company Danieli. The entire construction period was 7 months, setting a record high. The company replaced the original with a new continuous casting machine. The slab continuous casting machine is transformed into the main equipment structure of the original casting machine, the ladle car and part of the equipment. The new continuous casting machine is equipped with a full-protection pouring equipment and an automatic control system for casting high-quality steel, using electromagnetic stirring of the crystallizer. Technology, changing the water spray technology in the second cold zone (depending on the steel grade and drawing speed), two-point straightening technology, etc. By adopting the above technology, high-speed continuous casting of special steel can be realized, and the normal pulling speed is 3.5m/min. The working speed range is 3. 3~3.7m/min (the size depends on the superheat of the tundish steel), and the number of continuous casting furnaces is 9 furnaces.
The cast steel casts are high carbon steel, cold heading steel, spring steel, tire steel wire, wire bonding steel, and free cutting steel. In order to ensure safe operation when pouring leaded steel grades, an extractor is installed in both the crystallizer and the cutting zone. The billet gauge cast by the casting machine is 130mm, and the annual production capacity is 1.2 million tons. Xiaoma is excerpted from the 2000 International Continuous Casting Technology Seminar.
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