1.华北理工大学冶金与能源学院,唐山 063210
2.河北科技大学材料与工程学院,石家庄 050000
3.河钢集团唐钢公司热轧事业部,唐山 063600
朱立光(1965—),男,博士,教授;E-mail:zhuliguang@ ncst.edu.cn
王杏娟(1978—),女,博士,教授;E-mail:wxingjuan@ncst.edu.cn
收稿:2024-02-23,
纸质出版:2024-09-30
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朱立光,宋磊,王杏娟等.1Cr13不锈钢连铸保护渣成分设计[J].特殊钢,2024,45(05):90-96.
Zhu Liguang,Song Lei,Wang Xinjuan,et al.Ingredient Design of 1Cr13 Stainless Steel Continuous Casting Protective Slag[J].Special Steel,2024,45(05):90-96.
朱立光,宋磊,王杏娟等.1Cr13不锈钢连铸保护渣成分设计[J].特殊钢,2024,45(05):90-96. DOI: 10.20057/j.1003-8620.2024-00036.
Zhu Liguang,Song Lei,Wang Xinjuan,et al.Ingredient Design of 1Cr13 Stainless Steel Continuous Casting Protective Slag[J].Special Steel,2024,45(05):90-96. DOI: 10.20057/j.1003-8620.2024-00036.
在生产1Cr13不锈钢的过程中,铸坯出现了严重的纵裂漏钢及横向凹陷。利用FactSage8.2热力学软件计算三元以及四元相图对保护渣成分进行设计,同时,计算1Cr13不锈钢的凝固特性,由于该钢属于包晶钢,在凝固过程中会产生急剧的体积收缩,从而在坯壳薄弱处产生纵裂。为了避免初生坯壳不均匀引起的凹陷和纵裂,应适当提高保护渣碱度、改善保护渣结晶性能,并提升保护渣控制传热能力。新型保护渣碱度为1.5,渣成分为
w
[MgO]6%,
w
[Li
2
O]2%,
w
[Al
2
O
3
]16%,
w
[Na
2
O]8%,
w
[B
2
O
3
]3%,
w
[CaF
2
]10%。1Cr13不锈钢原渣熔点为1 155 ℃,定温黏度为0.442 Pa·s、转折温度1 140 ℃,新型保护渣熔点为1 120 ℃,黏度为0.304 Pa·s,转折温度为1 171 ℃,结晶温度为1 270 ℃。实际生产后,铸坯表面质量明显改善。
In the process of producing 1Cr13 stainless steel, serious longitudinal cracks breakout and transverse dents appear in the casting billet. FactSage8.2 thermodynamic software was used to calculate ternary and quadruple phase diagrams to design the ingredient of the protective slag. At the same time, the solidification characteristics of 1Cr13 stainless steel were calculated. As this steel is a peritectic steel, it will produce a sharp volume contraction during the solidification process, resulting in longitudinal cracks in the weak part of the blank shell. In order to avoid the dents and longitudinal crack caused by the uneven raw shell, the basicity of the protective slag should be improved, the crystallization property of the protective slag should be improved, and the heat transfer control ability of the protective slag should be improved too.The basicity of the new protective slag is 1.5, the slag is 6%MgO, 2%Li
2
O, 16%Al
2
O
3
, 8%Na
2
O, 3%B
2
O
3
, 10%CaF
2
. The melting point of the original slag of 1Cr13 stainless steel is 1 155 ℃, the constant temperature viscosity is 0.442 Pa·s, and the transition temperature is 1 140 ℃. The melting point of the new protective slag is 1 120 ℃, the viscosity is 0.304 Pa·s, the transition temperature is 1 171 ℃, and the crystallization temperature is 1 270 ℃. After actual production, the surface quality of the casting billet is obviously improved.
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