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1.发明公开METHOD FOR PRODUCING HIGH CLEANNESS STEEL EXCELLENT IN FATIGUE STRENGTH OR COLD WORKABILITY 有权工艺生产高纯度钢优良的耐疲劳或冷成形性
公开(公告)号：EP1707644A1
公开(公告)日：2006-10-04
申请号：EP04807278.9
申请日：2004-12-17
发明人： SAKAMOTO, K, Kobe Corp. Res. Lab. K.K.K. Seiko Sho , SUGIMURA, T, Kobe Corp. Res. Lab. K.K.K. Seiko Sho , YOSHIDA, A, Kobe Works K.K.K. Seiko Sho , FUKUZAKI, Y, Kobe Works K.K.K. Seiko Sho , SUDA, S, Kobe Works K.K.K. Seiko Sho
CPC分类号： C22C38/46 , C01B33/06 , C21C7/0006 , C21C7/04 , C21C7/076 , C21D8/065 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/18 , C22C38/24 , C22C38/40 , Y02P10/242
摘要： The present invention relates to a high-cleanliness steel having a high fatigue strength and high cold workability, and a method of making the high-cleanliness steel. The method adds a Li-Si alloy having a Li content between 20 and 40% and/or Li 2 CO 3 as a Li-containing substance to a molten steel. The Li-containing substance is added to the molten steel after the completion of a series of steps of a ladle refining process including composition adjustment, temperature adjustment and slag refining. The high-cleanliness steel has a total-Li content between 0.020 and 20 ppm by mass and contains 1.0 or below oxide inclusion particle having a major diameter of 20 µm or above at a maximum in 50 g of the steel wire. The steel contains an oxide inclusion that has a CaO content between 15 and 55%, SiO 2 content between 20 and 70%, an Al 2 O 3 content of 35% or below, a MgO content of 20% or below and a Li 2 O content between 0.5 and 20%. The high-cleanliness steel has improved fatigue characteristics and improved cold workability.
摘要翻译： 本发明涉及一种具有高疲劳强度和高冷加工性，并且使高洁净钢的方法的高洁净钢。 该方法增加了具有20至40％，和/或Li 2 CO 3 Li含量为含Li的物质到钢水锂-Si合金。 含Li的物质一系列浇包精炼过程的步骤，包括组合物的调整，温度调整及熔渣精炼完成后加入到钢水中。 高清洁度钢具有按质量计0.020和20ppm之间的总锂含量和含有具有20微米或以上的大直径在将50g钢丝的最大1.0或低于氧化物夹杂的颗粒。 钢含有在氧化物夹杂物确实具有15和55％，SiO 2的20和的Al 2 O 3含量为35％或低于70％之间的含量之间的CaO含量为20％或低于MgO的含量和李2 在0.5和20％O含量。 高清洁度钢具有改善的疲劳特性和改进的冷加工性。
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2.发明授权
公开(公告)号：EP1707644B1
公开(公告)日：2012-02-15
申请号：EP04807278.9
申请日：2004-12-17
发明人： SAKAMOTO, K, Kobe Corp. Res. Lab. K.K.K. Seiko Sho , SUGIMURA, T, Kobe Corp. Res. Lab. K.K.K. Seiko Sho , YOSHIDA, A, Kobe Works K.K.K. Seiko Sho , FUKUZAKI, Y, Kobe Works K.K.K. Seiko Sho , SUDA, S, Kobe Works K.K.K. Seiko Sho
IPC分类号： C21C7/04 , C21C7/076 , C22C38/00 , C22C38/06 , C22C38/58 , C22C38/02 , C22C38/04 , C22C38/24 , C22C38/18 , C22C38/40 , C22C38/46
CPC分类号： C22C38/46 , C01B33/06 , C21C7/0006 , C21C7/04 , C21C7/076 , C21D8/065 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/18 , C22C38/24 , C22C38/40 , Y02P10/242
摘要： A high cleanness steel which is produced by adding, as a Li-containing material, a Li-Si alloy having a Li content of 20 to 40 % and/or Li2CO3 into a molten steel, specifically, at a step wherein a series of molten metal treatments of the adjustment of components, temperature adjustments and the slag smelting have been completed, and which has a total Li content of 0.020 to 20 ppm (on the mass basis) and contains oxide based inclusions having a longer diameter of 20 μm or more in an amount of 1.0 piece or less per 50 g of the steel, wherein the oxide based inclusions being present in the steel contain, in mass %, 15 to 55 % of CaO, 20 to 70 % of SiO2, 35 % or less of Al2O3, 20 % or less of MgO, and 5 to 20 % of Li2O; and a method for the high cleanness steel. The above high cleanness steel is further improved in cold workability or in fatigue characteristics.
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