凝固组织对重轨钢铸坯中MnS的影响

李红光; 徐明丽; 何为; 王章印

doi:10.7513/j.issn.1004-7638.2024.05.020

凝固组织对重轨钢铸坯中MnS的影响

doi: 10.7513/j.issn.1004-7638.2024.05.020

李红光^{1, 2},
徐明丽¹,
何为²,
王章印²

1.
昆明理工大学冶金与能源工程学院, 云南昆明 650093
2.
攀钢集团攀枝花钢铁研究院有限公司, 钒钛资源综合利用国家重点实验室, 四川攀枝花 617000

详细信息

中图分类号: TF76, TG142
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- 文章访问数: 215
- HTML全文浏览量: 80
- PDF下载量: 14
- 被引次数: 0
出版历程
- 收稿日期: 2023-09-07
- 网络出版日期: 2024-10-30
- 刊出日期: 2024-10-30

Effects of solidification structure on MnS in heavy rail steel bloom

1.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
Panzhihua Iron and Steel Research Institute Co., Ltd., Pangang Group, State Key Laboratory of Vanadium and Titanium Resource Comprehensive Utilization, Panzhihua 617000, Sichuan, China

摘要

摘要: 采用电化学腐刻与Aspex扫描相结合，检测了重轨钢铸坯不同位置的MnS尺寸形貌，研究了凝固组织对MnS的影响。结果表明，凝固组织由混晶转变为粗大等轴晶时，3～5 μm的MnS颗粒数量比例降低，而≥10 μm的颗粒数量比例则明显增大。从距离铸坯窄面40 mm推移至100 mm，凝固组织类型转变越明显则≥10 μm的MnS颗粒数量比例增加越多：凝固组织发生明显转变时，其比例增加48.02%，凝固组织未发生类别转变时，其比例增加0.31%。通过连铸强化冷却等缩短局部凝固时间的工艺调控，可以促进MnS细小化控制。
- 重轨钢 /
- 连铸坯 /
- 凝固组织 /
- MnS
Abstract: The sizes and microstructures of MnS at different positions of the heavy rail steel bloom were measured by electro-chemical etching and Aspex scanning, and the effect of solidification structure on MnS was studied. The results show that when the solidification structure transforms from mixed-crystal to coarse equiaxed grain, the quantitative proportion of MnS particles with the size range of 3-5 μm decreases, and the quantitative proportion of particles with sizes larger than 10 μm increases significantly. While the distance from the narrow surface of the bloom changed from 40 mm to 100 mm, the solidification structure transformed more obviously, and the larger increment of the quantitative proportion of MnS particles with sizes over 10 μm was obtained: if the solidification structure transformed obviously, the quantitative proportion was increased by 48.02%, and if the solidification structure did not transform, the quantitative proportion was increased by 0.31%. It means MnS particles can be refined by adopting processes to shorten the local solidification time, such as strengthening cooling during continuous casting.
- heavy rail steel /
- continuous casting billet /
- solidification structure /
- MnS

HTML全文

图 1 铸坯凝固组织检测区域及非金属夹杂物浸出试样取样示意(单位：mm)

Figure 1. Sampling diagram for solidification structure and nonmetallic inclusion analysis in the bloom

下载: 全尺寸图片幻灯片

图 2 典型铸坯代表区域凝固组织照片

Figure 2. Solidification structure photograph of the representative area in a typical bloom

下载: 全尺寸图片幻灯片

图 3 铸坯各区域内的MnS典型形貌特征照片

Figure 3. Photographs of MnS in the different areas of the bloom

下载: 全尺寸图片幻灯片

图 4 铸坯不同位置区域的MnS非金属夹杂物颗粒尺寸分布

Figure 4. MnS particle size distributions in the different areas of the bloom

下载: 全尺寸图片幻灯片

图 5 铸坯不同位置凝固时间及二次枝晶臂间距分布

Figure 5. Distribution of solidification time and secondary dendrite arm spacing in the difference position of bloom

下载: 全尺寸图片幻灯片

图 6 典型铸坯的代表区域凝固组织检测结果照片

Figure 6. Photographs of solidification structure in the representative areas of a typical bloom

下载: 全尺寸图片幻灯片

图 7 铸坯代表区域的凝固组织构成对比

Figure 7. Comparison of solidification structure constitutes of the representative areas in the bloom

下载: 全尺寸图片幻灯片

图 8 铸坯不同位置区域内的MnS尺寸分布对比

（a）1～3 μm；（b）3～5 μm；（c）5～10 μm；（d）≥10 μm

Figure 8. Comparison of MnS particle size distribution in the different areas of the bloom

下载: 全尺寸图片幻灯片

表 1 U75 V重轨钢主要化学成分

Table 1. Chemical composition of U75V heavy rail steel %

C	Si	Mn	P	S	V
0.76	0.65	0.90	0.015	0.010	0.08

下载: 导出CSV

表 2 连铸关键工艺对比

Table 2. Comparison of the key continuous casting parameters

项目	M-EMS	F-EMS	过热度/ ℃	二冷比水量/ （L·kg⁻¹）	拉速/ （m·min⁻¹）
试样1 （典型工艺）	强	无	20～25	0.23～0.24	0.64～0.65
试样2	中	中	20～25	0.26～0.27	0.64～0.65
试样3	弱	中	30～35	0.30～0.31	0.68～0.70

下载: 导出CSV

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