92 t EAF-LF冶炼20G钢液的氮含量控制

特殊钢 ›› 2005, Vol. 26 ›› Issue (6): 59-60.

92 t EAF-LF冶炼20G钢液的氮含量控制

王海兵

攀钢集团成都钢铁有限责任公司，成都610069

收稿日期:2005-06-24 出版日期:2005-11-08 发布日期:2023-04-13
作者简介:王海兵(1965-),男，工程师，1987年重庆大学冶金系毕业，从事炼钢技术工作。

Control of Nitrogen Content in Molten Steel 20G Melted by a 92 t EAF-LF Process

Wang Haibing

Chengdu Iron and Steel Co Ltd,Pan Steel Group,Chengdu 610069

Received:2005-06-24 Published:2005-11-08 Online:2023-04-13

摘要/Abstract

摘要： 攀成钢公司采用92 t EBT(偏心底)UHP EAF-LF(钢包炉)工艺冶炼成分(%)为0.17~0.23C-≤0.15Mo的高压锅炉钢20G。操作实践表明,在EAF(电弧炉)炉料中配加35%的生铁,并通过添加3~10 mm的碳粒和强化供氧,形成500~750 mm的泡沫渣,以利去除钢液中的部分氮,使EAF出钢时钢中氮含量平均达到45×10^-6。LF精炼时采用大渣量埋弧操作,氩气弱搅拌和缩短加热时间,以便控制精炼时钢液增氮量不超过10×10^-6,并使LF精炼后钢中氮含量达(60~66)×10^-6,有效地防止钢材产生时效脆性。

关键词: 电弧炉, 钢包炉, 氮含量控制

Abstract: The 0. 17~0.23C-≤0. 15Mo steel 20G for high pressure boiler is melted by a 92 t UHP EBT EAF-LF process at Chengdu Iron and Steel,Pan Steel Group. The operation practice showed that 35% pig iron in charge for arc furnace,adding 3~10 mm carbon particle and stengthening supply oxygen to form 500~750 mm foaming slag were available to remove partial nitrogen in molten steel,as a consequence the average nitrogen in steel came to 45×10-⁶ at arc furnace tapping. During LF refining, the operation of large amount slag embedding arc, weak argon stiring and cutting-down heating time was adopted to control the increment of nitrogen in steel no more than 10×10-⁶ in refining period.The nitrogen content in steel after refining in LF was(60~66)×10-⁶,that was efficiently to prevent aged brittleness of steel products.

Key words: Electric Arc Furnace, Ladle Furnace, Control of Nitrogen Content

王海兵. 92 t EAF-LF冶炼20G钢液的氮含量控制[J]. 特殊钢, 2005, 26(6): 59-60.

Wang Haibing. Control of Nitrogen Content in Molten Steel 20G Melted by a 92 t EAF-LF Process[J]. Special Steel, 2005, 26(6): 59-60.