宝钢碱性氧气转炉炼钢生产及洁净钢控制外文翻译中英对照英汉互译.docVIP

毕 业 设 计 外 文 翻 译 专 业： 冶金工程 班 级： 冶金一班 Basic oxygen furnace based steel-making processes and cleanliness control at Baosteel L. Zhang*1, J. Zhi2, F. Mei2, L. Zhu2, X. Jiang2, J. Shen2, J. Cui2, K. Cai3 and B. G. Thomas4 Optical microscopy, total oxygen measurements and slime tests have been conducted to quantify the size distribution and amount of inclusions at various processing steps during basic oxygen furnace (BOF) based steel production at Baosteel. The effects on steel cleanliness of specific operational improvements during steel refining and continuous casting have been investigated. Such improvements to these processes and the resulting level of steel cleanliness at Baosteel are summarised in the present paper. Ladle slag reduction lowers FeO + MnO in the slag to below 5%, decreasing steel reoxidation by the slag. Calcium treatment by CaSi wire injection during ladle furnace (LF) refining is used to modify inclusions . Slag detection is employed at the ladle bottom during continuous casting. Flow control devices, CaO containing filters and high CaO based basic powder with CaO/Si024 are used in the tundish to remove more inclusions. With this BOF based steelmaking process, impurity levels can be controlled to achieve-total oxygen (TO)16 ppm, [S]5 ppm, [P]35 ppm, [N]29 ppm, [H]1 ppm in line pipe steels, and [C]16 ppm, TO19 ppm, [N]15 ppm in interstitial free (IF) steels. Keywords: Clean steel, Inclusions, Impurity elements, Interstitial free steel, Line pipe steel Introduction The importance of clean steel in terras of product quality is increasingly being recognised. Clean steel requires control of the size distribution, morphology and composition of non-metallic oxide inclusions in addition to the amount. Furthermore, sulphur, phosphorus, hydrogen, nitrogen and even carbon[1,2] should also be controlled to improve the steel properties. For example, ,formability, ductility and fatigue strength worsen wi