高级别管线钢镁处理研究

特殊钢 ›› 2009, Vol. 30 ›› Issue (2): 4-6.

高级别管线钢镁处理研究

李太全，包燕平，吴华杰，安航

北京科技大学冶金与生态工程学院，北京 100083

收稿日期:2008-09-23 出版日期:2009-04-01 发布日期:2022-11-28
作者简介:李太全(1970-)，男，博士研究生，1995年华东冶金学院毕业，高级别管线钢研究。

A Study on High Grade Pipeline Steel Treated by Magnesium

Li Taiquan , Bao Yanping , Wu Huajie , An Hang

Metallurgical and Ecological Engineering School,University of Science and Technology,Beijing 100083

Received:2008-09-23 Published:2009-04-01 Online:2022-11-28

摘要/Abstract

摘要： 运用热力学计算了氧化镁及其复合夹杂物在X80管线钢液中的析出条件,即1873 K时以管线钢酸溶铝目标含量0.025%计算,当0.000 8%≤[Mg]≤0.005 9%,钢中生成MgO·Al₂O₃夹杂物,当[Mg]>0.0059%,钢中将有MgO生成。[Ti]为0.015%时,[Mg]=0.001 4%可生成2MgO·TiO₂复合夹杂,同时0.025%≤[Al]≤0.047%时生成A1₂O₃·TiO₂复合夹杂物。50kg真空感应炉熔炼的管线钢经SEM和EDS分析表明,镁处理钢中的夹杂物小于2μm占85%,2～5μm的占14.5%,5～10μm的夹杂物仅有0.5%。用微镁处理的管线钢的脱氧产物为2MgO·TiO₂、MgO·Al₂O₃等,这些脱氧产物还会和硫化物、氮化物形成复合夹杂物。

关键词: 管线钢, 镁处理, 夹杂物

Abstract: Precipitation conditions of magnesium oxide and its compounded inclusions in liquid in X80 pipeline steel was calculated by thermodynamics,that were calculating according to aim acid-soluble aluminium content 0.025% in pipe-line steel at 1873 K,as 0.0008%≤[Mg]≤0.0059%,the compounded inclusion MgO ·Al₂O₃ formed in steel,and as [Mg] ≤ 0.0059%,the MgO should formed in steel.With[Ti]0.015%,as [Mg]=0.0014%,the compounded inclusion 2MgO ·TiO₂ formed,and as 0.025% ≤ [Al]≤0.047%,the compounded inclusion Al₂O₃ ·TiO₂ formed in steel.The analysis on pipeline steel melted with 50 kg vacuum induction furnace by SEM and EDS showed that in steel treated by magnesium the percentage of inclusion less than 2 μm was 85%,2~5 μm was 14.5% and 5～10 um was only 0.5%. The deoxidation products in pipeline steel treated by magnesium were 2MgO ·TiO₂,MgO ·Al₂O₃ etc,which could be combined with sulfide and nitride to form compounded inclusions.

Key words: Pipeline Steel, Magnesium Treatment, Inclusions

李太全, 包燕平, 吴华杰, 安航. 高级别管线钢镁处理研究[J]. 特殊钢, 2009, 30(2): 4-6.

Li Taiquan , Bao Yanping , Wu Huajie , An Hang. A Study on High Grade Pipeline Steel Treated by Magnesium[J]. Special Steel, 2009, 30(2): 4-6.

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