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 Wysłany: Wto 18:49, 04 Sty 2011 Temat postu: ugg stivali Heat-resistant long-life rare earth ma |
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Heat-resistant long-life rare earth magnets
; By 2010, Baosteel comprehensive competitiveness of iron and steel industry into the world's top three, and become independent intellectual property rights and the international competitiveness of the large multinational companies. Baosteel Group Corporation Chairman and General Manager Xie said, the guidance of scientific development, Baosteel has been drawn to the \million t, to 50 million t. \%. According to a new round of development goals, Baosteel will actively implement the strategy of the steel quality, appropriate diversification strategy, capital management strategy and international business strategy. In the management system to accelerate the pace of integration of operations, by 2005 the overall operation of the system and shape the formation, integration of operations in 2010, direct access to international capital markets, an international and public technology companies. In the new strategy, Baosteel special attention to \Baosteel believes that in an open international market conditions,[link widoczny dla zalogowanych], lack of an original capacity of enterprises, will be difficult to take the initiative to carry out strategic restructuring of its own,[link widoczny dla zalogowanych], of course, can not become truly \This indicates that innovation will be the main strategy of Baosteel means of research and development, as Baoshan Iron and Steel Core Competence of the key links. Satellite feeds the heat of rare earth magnets long life Three Friends of Special Metals Corporation of Japan developed into a new type of rare-earth magnet, its main ingredient is neodymium, iron, boron, added in the manufacturing process a certain amount of cobalt, vanadium, molybdenum. Rare earth magnets in the drill added to prevent oxidation of the magnet, but the magnet of the magnetic force will decline, while in the magnet can be combined with others to prevent the magnetic vanadium and molybdenum decreased. The new magnets in the temperature of 125oC, 85% relative humidity, pressure of about 200kPa more than 100h under the conditions of use, still maintain their original magnetic. The material can be used for audio equipment, speakers, machine tool motors and robots and so on. Rong From ((MeTa ~ LrtylYr} 2003 No. 9 N on the creep properties of high boron 9Or influence of steel 13 Horiuchi et al have reported, 9Cr heat resisting steel in order to avoid generating excess BN can be ultra-low-nitrogen steel based on the addition of high content of boron (B), the creep speed change be delayed to improve the creep life. However, the main steam pipe of large components commonly used steel smelting furnace, electric furnace steel to control the nitrogen content in the tens of / ~ g / g or less is not easy. this thing build institutions in Japan, Sumitomo Metal Industries and Mitsubishi Heavy Industries to jointly study the nitrogen on the high creep resistance of B steel. to 0.08C a 9Cr a 3W one 3Co a 02V one 005Nb 10 .013 B steel as tested steel, nitrogen contents were 15,79 and 650gg / g. 25mm thickness of steel plate, insulation 1h at 1323K followed by air cooling under the normalizing and 4h at 1043K under air cooling after holding back the fire. The specimen 923K under the creep test,[link widoczny dla zalogowanych], and the inclusion of material after heat treatment and the distribution of fracture observed BN. The results are as follows,[link widoczny dla zalogowanych], in the 923K, 140MPa creep curve for a time by the speed of the curve indicated that N content, and containing 15 / ~ g / gN steel, compared with 79 and 650 / ~ g / gN transition stage creep rate of steel is small, the minimum creep rate decreased more than 2 digits. Second, 79t ~ g / gN steel and 65 / ~ g / gN compared to the creep of steel changes little difference, but adding excess N of 650 / ~ g / gN early stage of accelerated creep of steel changes,[link widoczny dla zalogowanych], on the contrary, 79 / ~ g / gN transition long duration creep of steel. In addition , the inclusion of carbon and nitrogen compounds found in MX-type elements in Nb, V and so on. With increasing inclusion of V N content increased significantly. also observed that adding excess 650 / ~ g / gN content of steel has thick BN Precipitation
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