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非调质钢铸坯中夹杂物的分布

周志伟1,田俊2,徐益峰1   

  1. (1.江苏苏钢集团有限公司,江苏苏州215153; 2.苏州大学沙钢钢铁学院,江苏苏州215021)
  • 接受日期:1900-01-01 出版日期:2019-10-05

Distribution of inclusions in non-quenched and tempered steel billets

  • Accepted:1900-01-01 Online:2019-10-05

摘要: 在非调质钢铸坯上不同位置取样,用SEM-EDS和Aspex对试样中夹杂物进行分析统计,并用FactSage软件计算了夹杂物的析出情况,通过分析主要得出以下结论:从铸坯边部到中心,夹杂物的平均尺寸和平均面积逐渐增加,夹杂物密度逐渐减小,氧化物尺寸变化不大,硫化物尺寸逐渐增加。含硫非调质钢中夹杂物类型主要是硫化物和少量的氧化物。氧化物的析出温度为1400~1600℃,成分均在三元相图的固态区,不易聚合长大;MnS在1450℃时析出数量逐渐增多,在1350℃时开始大量析出;在铸坯凝固过程中,MnS以氧化物为核心形核析出。

关键词: 非调质钢, 夹杂物, 连铸坯, 硫化物

Abstract: Samples were taken from different locations of non-quenched and tempered steel billets,andinclusionsofthesesampleswere analyzedbySEM-EDSandAspex.Precipitation ofinclusion had been calculated usingFactsagesoftware. The results showed that,the average sizeofinclusions increasedgraduallyandinclusiondensity decreasedgradually from edge to center ofthe billet. Besides,oxides didn't change much in size and sulfide size increased gradually. The inclusions types were main sulfide and oxide. The precipitation temperature of oxide was 1400-1600 ℃, and composition of the oxide were in solid area of the ternary phase diagram at steel making temperature,so they were not easy to aggregate. The quantity of MnS was increasing at the temperature of 1450 ℃,and a substantial precipitation of MnS begins at 1350 ℃.Duringthe solidification process,MnSwasprecipitatedonoxide as the core.

Key words: non-quenched and tempered steel, inclusion, continuous casting billet, sulfide