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首页> 外文期刊>ISIJ international >Identification of Cracking Issues and Process Improvements through Plant Monitoring and Numerical Modelling of Secondary Cooling during Continuous Casting of HSLA Steels
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Identification of Cracking Issues and Process Improvements through Plant Monitoring and Numerical Modelling of Secondary Cooling during Continuous Casting of HSLA Steels

机译：HSLA钢连续铸造中的植物监测和数值模型鉴定裂解问题及工艺改进

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摘要

A holistic approach to diagnose the occurrence of cracking on HSLA steel slabs and propose counter-measures to prevent them is presented. The approach consisted on plant monitoring, including direct temperature measurements in the strand with pyrometers. Extensive characterization was performed via thermo-mechanical tests and microscopy techniques which revealed combination of Widmanstaetten fer-rite, acicular ferrite and secondary phases that promote embrittlement during casting with a minimum ductility between 700°C-800°C (± 50°C) which is responsible for cracking in this steel. Finally, 1D and 3D numerical models were developed to test possible cooling strategies which proved that reductions in water flowrate can have a positive effect in slab quality by avoiding the low ductility zone. Corrective actions included decreasing cooling to increase the overall temperature of the strand before the straight-ener to increase the overall temperature. Yet, some slabs still observed the presence of cracks which points at secondary factors such as high tundish temperatures ＞ 1 530°C producing cracking. Other secondary factors include strong temperature variations up to ± 250°C during measurements which would send the strand corners into the low ductility range producing cracking despite having a hot slab centre. Although these optimization strategies are particular to each caster and steel grade, a similar approach could be applied to address secondary cooling issues during continuous casting. The models presented are an ideal toolkit to analyse the influence of product size and operation parameters in combination with plant monitoring and extensive microstructure characterization to improve the quality and productivity of the process.
机译：介绍HSLA钢板上裂缝发生的整体方法，并提出了防止它们的反措施。该方法组成的植物监测，包括用高温计的股线中的直接温度测量。通过热机械测试和显微镜技术进行了广泛的表征，其揭示了Widmansteten FER-RITE，针状铁氧体和二次相的组合，这些技术在铸造期间促进脆性的脆性，其中最小延展性在700°C-800°C（±50°C）之间负责在这种钢中开裂。最后，开发了1D和3D数值模型，以测试可能的冷却策略，证明水流量的减少可以通过避免低延展区来对板坯质量产生积极影响。纠正措施包括降低冷却，以提高直线前股线的总温度，以增加整体温度。然而，一些板坯仍然观察到存在裂缝，其次要因素如高中温度> 1 530℃产生裂化。其他次要因素包括在测量期间的强温变化高达±250°C，这将使股线拐角处于尽管具有热板中心产生裂化的低延展性范围。尽管这些优化策略特别适用于每个施法者和钢级，但是可以应用类似的方法来解决连续铸造期间的二次冷却问题。提供的模型是一种理想的工具包，用于分析产品尺寸和操作参数的影响与植物监测和广泛的微观结构表征，以提高该过程的质量和生产力。

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  • 来源
    《ISIJ international》 |2021年第3期|834-843|共10页
  • 作者

    Rosa Maria PINEDA HUITRON; Pavel Ernesto RAMIREZ LOPEZ; Esa VUORINEN; Pooria NAZEM JALALI; Maija KAERKKAEINEN;

  • 作者单位

    Materials Science Department of Engineering Science and Mathematics Lulea University of Technology SE 97 187 Lulea Sweden;

    Raw Materials and Quality SWERIM AB Aronstorpsvaegen 1 SE-97437 Lulea Sweden Materials Science and Engineering Royal Institute of Technology (KTH) Brinellvaegen 23 SE-100 44 Stockholm Sweden;

    Materials Science Department of Engineering Science and Mathematics Lulea University of Technology SE 97 187 Lulea Sweden;

    Raw Materials and Quality SWERIM AB Aronstorpsvaegen 1 SE-97437 Lulea Sweden;

    Steel production SSAB Europe Oy Raahe works Rautaruukintie 155 PL 93 92101 Raahe Finland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    continuous casting; HSLA steels; plant monitoring; crack susceptibility; cooling curves;

    机译：连续铸造;HSLA钢;植物监测;裂缝易感性;冷却曲线;

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