430不锈钢保护渣结晶型渣圈生长过程分析

王杏娟; 宋元龙; 朱立光; 张建宇; 司旭林; 郑雪龙

doi:10.7513/j.issn.1004-7638.2025.04.017

430不锈钢保护渣结晶型渣圈生长过程分析

doi: 10.7513/j.issn.1004-7638.2025.04.017

王杏娟^1,,
宋元龙¹,
朱立光^{1, 2, ,},
张建宇¹,
司旭林¹,
郑雪龙¹

1.
华北理工大学冶金与能源学院, 河北唐山 063210
2.
河北科技大学材料科学与工程学院, 河北石家庄050018

基金项目: 国家自然科学基金项目（52374335，51974133）；河北省自然科学基金重点项目（E2022208019）。

详细信息

作者简介:
王杏娟，1978年出生，女，河北邢台市人，博士，教授，主要从事连铸保护渣研究，E-mail：wxingjuan@ncst.edu.cn

通讯作者:
朱立光，1965年出生，男，河北丰南人，博士，教授，主要从事连铸及铸坯质量控制，E-mail：zhuliguang@ncst.edu.cn

中图分类号: TF777,TF044.3
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- 文章访问数: 56
- HTML全文浏览量: 34
- PDF下载量: 6
- 被引次数: 0
出版历程
- 收稿日期: 2024-11-21
- 网络出版日期: 2025-08-31
- 刊出日期: 2025-08-31

Analysis of the growth process of crystallized slag rim in 430 stainless steel mold flux

1.
School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China
2.
College of Materials and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China

摘要

摘要: 某钢厂430不锈钢采用进口保护渣常常形成过大的渣圈，影响铸坯的质量。为了明晰其渣圈长大原因，采用结晶器渣膜热流模拟仪，制取1450 ℃条件下430不锈钢保护渣结晶型渣圈，并利用扫描电镜分析其微观结构，以探究渣圈生长过程。同时，使用Factsage软件进行热力学模拟，并与XRD试验结果对比。结果发现：高熔点的硅酸二钙、硅灰石、黄长石和枪晶石优先析出冷凝在器壁上，形成初始结晶型渣圈，占35%；随后，较低熔点的菱硅钙钠石黏附在此层，占20%；最后，夹杂少量霞石的枪晶石逐渐附着在已形成的渣圈上，占45%。通过对这一过程的分析，揭示了430不锈钢保护渣结晶型渣圈的形成机制，为控制渣圈生长提供了理论依据。
- 430不锈钢 /
- 结晶型渣圈 /
- 微观结构 /
- 生长机理
Abstract: A certain steel plant using imported mold flux for 430 stainless steel often results in excessively large slag rims that affect the quality of the cast slab. To clarify the reasons for the enlargement of the slag rings, this study employed a slab mold slag film heat flux simulator to create a crystallized slag rim for ultra-low carbon protection slag at 1450 °C. SEM microstructural analysis was used to explore the growth process of the slag rim. Additionally, thermodynamic simulations using Factsage were conducted and compared with XRD experimental results. The findings revealed that high-melting-point phases dicalcium silicate, wollastonite, feldspar, and gunite preferentially crystallized and condensed on the mold wall, forming the initial crystallized slag rim (35%). Subsequently, lower-melting-point combeite adhered to this layer (20%). Lastly, cuspidine containing minor nepheline gradually deposited on the existing slag rim (45%).Through the analysis of this process, the study elucidated the formation mechanism of the crystallized slag rims in 430 stainless steel mold flux, providing a theoretical basis for controlling the slag rims growth.
- 430 stainless steel /
- crystalline slag rim /
- microstructure /
- growth mechanism

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图 1 现场渣圈宏观形貌

(a)渣圈总貌；(b)截取样1；(c)截取样2；(d)(c)渣圈的光薄片

Figure 1. Macroscopic morphology of on-site slag rim

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图 2 现场渣圈微观形貌

(a)镶样后的现场渣圈；(b) A区放大；(c) B区放大；(d) C区放大

Figure 2. Microscopic morphology of on-site slag rim

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图 3 结晶器渣膜热流模拟仪升温过程

Figure 3. Heating process of the mold slag film thermal simulator

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图 4 制取的结晶型渣圈宏观形貌

(a)结晶型渣圈总貌；(b)截取的部分结晶型渣圈

Figure 4. Macroscopic morphology of the synthesized crystallized slag rim

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图 5 结晶型渣圈横截面

Figure 5. Cross-section morphology of the crystalline slag rim

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图 6 结晶型渣圈区域1和2的微观结构

(a)靠近器壁处形貌；(b)(c)区域1；(d)(e)区域2

Figure 6. Microstructures of crystallized slag rim regions 1 and 2

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图 7 图5中区域3微观结构

(a)区域3；(b)区域A；(c)区域B元素能谱分析

Figure 7. Microstructure of region 3 in figure 5

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图 8 图5中区域4微观结构

(a)区域4；(b)区域A；(b)区域B元素能谱分析

Figure 8. Microstructure of region 4 in figure 5

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图 9 图5中区域4不同位点微观结构

(a)区域4；(b)区域A；(c)区域B

Figure 9. Microstructure at various locations in region 4 of figure 5

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图 10 图5中区域5微观结构

(a)区域5；(b)区域A；(c)区域B元素能谱分析

Figure 10. Microstructure of region 5 in figure 5

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图 11 图5中区域6微观结构

(a)区域6；(b)区域A；(c)区域B元素能谱分析

Figure 11. Microstructure of region 6 in figure 5

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图 12 结晶型渣圈生长过程

Figure 12. Growth process of crystalline slag rim

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图 13 1450 ℃结晶型渣圈XRD矿物分析

Figure 13. XRD mineral analysis of crystalline slag rim at 1450 ℃

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表 1 430不锈钢成分

Table 1. Composition of 430 stainless steel %

C	Si	Mn	P	S	Cr	Ni	N
0.030～ 0.040	0.250～ 0.350	0.250～ 0.500	≤0.030	≤0.005	16.00～ 17.00	≤0.400	0.030～ 0.050

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表 2 430不锈钢保护渣成分

Table 2. Composition table of ultra-low carbon mold slag %

成分	碱度	Al₂O₃	Fe₂O₃	F	MgO	Na₂O	C-total
测验值	1.16	6.30	1.80	5.80	1.00	10.30	2.50

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表 3 430不锈钢保护渣降温过程中析出物质

Table 3. Precipitated substances during cooling of 430 stainless steel mold flux

温度/℃	析出物质成分
1450～1315	Slag-liq cooling
1315～1167	Ca₂SiO₄
1167～1099	Bredigite+ Ca₂SiO₄
1099～1042	Bredigite + Ca₂SiO₄ + Ca₄Si₂F₂O₇
1042～1000	Bredigite + Ca₃Si₂O₇+ Ca₄Si₂F₂O₇
1000～992	Na₂CaAl₄O₈+Bredigite + Ca₃Si₂O₇+ Ca₄Si₂F₂O₇
992～921	Combeite + Na₂CaAl₄O₈ + Ca₄Si₂F₂O₇
921～829	Combeite + Na₂CaAl₄O₈ + Na₂CaSiO₄
829～815	Combeite + Na₂CaAl₄O₈ + NaF
815～797	Combeite + Na₂CaAl₄O₈ + NaF + Na₂MgSiO₄
797～793	Nepheline+Combeite+Na₂CaAl₄O₈+NaF + Na₂MgSiO₄
793～792	Nepheline + Combeite + NaF+ Na₂MgSiO₄ + Ca₄Si₂F₂O₇

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