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20CrMo合金钢生产过程中非金属夹杂物的演变

王伟健 罗艳 张立峰 任英

王伟健, 罗艳, 张立峰, 任英. 20CrMo合金钢生产过程中非金属夹杂物的演变[J]. 工程科学学报, 2021, 43(8): 1090-1099. doi: 10.13374/j.issn2095-9389.2020.12.17.003
引用本文: 王伟健, 罗艳, 张立峰, 任英. 20CrMo合金钢生产过程中非金属夹杂物的演变[J]. 工程科学学报, 2021, 43(8): 1090-1099. doi: 10.13374/j.issn2095-9389.2020.12.17.003
WANG Wei-jian, LUO Yan, ZHANG Li-feng, REN Ying. Evolution of nonmetallic inclusions during production of 20CrMo alloy steel[J]. Chinese Journal of Engineering, 2021, 43(8): 1090-1099. doi: 10.13374/j.issn2095-9389.2020.12.17.003
Citation: WANG Wei-jian, LUO Yan, ZHANG Li-feng, REN Ying. Evolution of nonmetallic inclusions during production of 20CrMo alloy steel[J]. Chinese Journal of Engineering, 2021, 43(8): 1090-1099. doi: 10.13374/j.issn2095-9389.2020.12.17.003

20CrMo合金钢生产过程中非金属夹杂物的演变

doi: 10.13374/j.issn2095-9389.2020.12.17.003
基金项目: 国家自然科学基金资助项目(U1860206,51725402)
详细信息
    通讯作者:

    E-mail:zhanglifeng@ysu.edu.cn

  • 中图分类号: TF769.2

Evolution of nonmetallic inclusions during production of 20CrMo alloy steel

More Information
  • 摘要: 为了进一步研究20CrMo合金钢在生产过程中夹杂物的演变机理,实现对钢中非金属夹杂物的合理控制,保证生产顺行,提高产品力学性能,针对“BOF→LF→RH→钙处理→连铸→热轧”工序生产20CrMo合金钢全流程中非金属夹杂物的演变规律进行了研究。在LF精炼及RH精炼加钙前钢中非金属夹杂物含有70%以上的Al2O3。钙处理后,由于过量的钙加入到钢液中,夹杂物中CaS质量分数迅速增加至59%,Al2O3质量分数降低至21%。在连铸过程中由于二次氧化的发生,夹杂物转变为CaO−Al2O3,其中含有50%的Al2O3、39%的CaO和10%的CaS,并且夹杂物平均尺寸增加。在钢的冷却和凝固过程中,CaO质量分数降低至5%,CaS质量分数增加至57%,钢中夹杂物转变为Al2O3−CaO−CaS的复合夹杂物,同时含有少量大尺寸的CaO−Al2O3夹杂物。在钢的轧制过程中,夹杂物中CaO含量进一步降低,CaS含量增加,夹杂物平均尺寸增加,形成了CaO−Al2O3与CaS黏结型的复合夹杂物与Al2O3−CaS复合夹杂物。对CaO-Al2O3与CaS黏结型的复合夹杂物的形成原因进行了讨论。

     

  • 图  1  精炼及连铸过程相关元素含量变化。(a)总硫含量、总氧含量、总氮含量;(b)总钙含量、总铝含量

    Figure  1.  Variation of composition in liquid steel: (a) T.S, T.O, and T.N contents; (b) T.Ca and T.Al contents

    图  2  生产过程中夹杂物平均尺寸及数密度变化

    Figure  2.  Changes in average diameter and number density of inclusions during the production process

    图  3  精炼及连铸过程夹杂物成分分布。(a)LF进站;(b)RH进站;(c)RH加钙后[31];(d)中间包浇注1/3[31]

    Figure  3.  Composition distribution of inclusions at refining and continuous casting process: (a) start of LF; (b) start of RH; (c) RH after Ca addition[31]; (d) tundish[31]

    图  4  连铸坯及轧材中夹杂物成分分布。(a)连铸坯;(b)热轧中间坯;(c)热轧板

    Figure  4.  Composition distribution of inclusions in slab and rolling plate: (a) slab; (b) hot-rolled intermediate sheet; (c) hot rolling plate

    图  5  生产过程中夹杂物平均成分变化

    Figure  5.  Changes in the composition of inclusions during the production process of 20CrMo steel

    图  6  钙处理后及中间包中夹杂物尺寸分布。(a)加钙后;(b)中间包

    Figure  6.  Size distribution of inclusions after calcium treatment and in tundish: (a) after Ca addition; (b) tundish

    图  7  随氧含量增加,钢中夹杂物变化(温度: 1823 K)

    Figure  7.  Change in inclusions with increased oxygen content (Temperature: 1823 K)

    图  8  钙含量对20CrMo钢中夹杂物的影响

    Figure  8.  Effect of T.Ca content on inclusions in 20CrMo steel

    图  9  随温度降低夹杂物本身物相转变

    Figure  9.  Phase transformation of the inclusion with decreasing temperature

    图  10  随温度降低钢中夹杂物物相转变

    Figure  10.  Phase transformation of the inclusions in the steel with decreasing temperature

    图  11  中间包中典型夹杂物形貌。(a)CaO−Al2O3;(b)CaO−Al2O3与CaS复合夹杂物

    Figure  11.  Morphology of typical inclusions in tundish: (a) CaO−Al2O3; (b) CaO−Al2O3−CaS compound inclusions

    图  12  铸坯及轧材中典型夹杂物形貌。(a)均相Al2O3−CaO−CaS复合夹杂物;(b)Al2O3−CaO与CaS黏结型夹杂物;(c)CaS夹杂物

    Figure  12.  Morphology of typical inclusions in slab and plate: (a) homogeneous Al2O3−CaO−CaS inclusions; (b) Al2O3−CaO and CaS compound inclusions; (c) CaS

    图  13  铸坯中夹杂物尺寸与成分关系

    Figure  13.  Relationship between the size and composition of inclusions in the slab

    图  14  CaO−Al2O3与CaS黏结型夹杂物形成示意图

    Figure  14.  Schematic diagram of the formation mechanism of CaO−Al2O3 and CaS bonded inclusions

    表  1  20CrMo合金钢化学成分(质量分数)

    Table  1.   Chemical composition of 20CrMo steel %

    CSiMnCrMoT.AlT.ST.Ca
    0.20.210.550.950.20.025<0.0030.0025
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-12-17
  • 网络出版日期:  2021-03-06
  • 刊出日期:  2021-08-25

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