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Research on Online Traceability Methods for the Causes of Longitudinal Surface Crack in Continuous Casting Slab

Tallennettuna:
Julkaisussa:Materials vol. 18, no. 15 (2025), p. 3695-3712
Päätekijä: Cong Junqiang
Muut tekijät: Lv Qiancheng, Fan Zihao, Ling Haitao, He, Fei
Julkaistu:
MDPI AG
Aiheet:
Mechanical properties
Molds
Casting defects
Root cause analysis
Data processing
Heat transmission
Continuous casting
Heat
Data integration
Slab casting
Water quality
Cracks
Statistical analysis
Liquid metals
Casting machines
Cooling
Data integrity
Metal plates
Viscosity
Artificial intelligence
Temperature
Process controls
Missing data
Data collection
Heat transfer
Methods
Tracing
Surface cracks
Water hardness
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Abstrakti:In the casting and rolling production process, surface longitudinal cracks are a typical casting defect. Tracing the causes of longitudinal cracks online and controlling the key parameters leading to their formation in a timely manner can enhance the stability of casting and rolling production. To this end, the influencing factors of longitudinal cracks were analyzed, a data integration storage platform was constructed, and a tracing model was established using empirical rule analysis, statistical analysis, and intelligent analysis methods. During the initial production phase of a casting machine, longitudinal cracks occurred frequently. The tracing results using the LightGBM-SHAP method showed that the relative influence of the narrow left wide inner heat flow ratio of the mold was significant, followed by the heat flow difference on the wide symmetrical face of the mold and the superheat of the molten steel, with weights of 0.135, 0.066, and 0.048, respectively. Based on the tracing results, we implemented online emergency measures. By controlling the cooling intensity of the mold, we effectively reduced the recurrence rate of longitudinal cracks. Root cause analysis revealed that the total hardness of the mold-cooling water exceeded the standard, reaching 24 mg/L, which caused scaling on the mold copper plates and uneven cooling, leading to the frequent occurrence of longitudinal cracks. After strictly controlling the water quality, the issue of longitudinal cracks was brought under control. The online application of the tracing method for the causes of longitudinal cracks has effectively improved efficiency in resolving longitudinal crack problems.
ISSN:1996-1944
DOI:10.3390/ma18153695
Lähde:Materials Science Database