Vertical continuous casting machines were the earliest type of continuous casting machine developed. Although many steel companies now use arc or horizontal continuous casting machines to expand production scale, vertical continuous casting machines still possess irreplaceable advantages in certain specific fields and the production of high-end products.
The following are the core advantages of vertical continuous casting machines:
Superior Billet Quality (Core Advantage)
This is the most important and prominent advantage of vertical continuous casting machines.
No Bending and Straightening Stress: From the start of the crystallizer, the billet moves vertically downwards without any bending or straightening during the entire solidification process. This is crucial for producing steel grades and alloys with high crack sensitivity (such as certain high-alloy steels, stainless steels, and high-speed tool steels). Bending and straightening processes generate enormous stress at the solidification front of the billet (the junction of the liquid core and solid shell), which can easily lead to internal or surface cracks.
Good Inclusion Floating Conditions: Due to the vertical solidification of the billet, non-metallic inclusions in the molten steel have ample time and space to float upwards to the top protective slag, where they are removed. This significantly improves the purity of the molten steel, making it ideal for producing products with extremely high cleanliness requirements, such as aerospace steel and high-grade bearing steel.
Symmetrical and uniform solidification structure: The vertical solidification direction ensures symmetrical cooling, resulting in a more uniform distribution of the solidification structure of the billet (such as equiaxed and columnar crystal regions), reducing segregation and asymmetry caused by gravity.
Simple and stable process flow
Simple equipment alignment: All rollers and nozzles are aligned vertically, simplifying equipment alignment and maintenance.
Stable process: The uniform vertical static pressure of the molten steel promotes uniform melting and lubrication of the protective slag within the crystallizer, and ensures more stable contact between the billet and the guide rollers, reducing the risk of accidents such as steel leakage.
Particularly Suitable for Specific Materials and Cross-Sections
High-alloy steel and special alloys: As mentioned above, due to their stress-free solidification characteristics, they are ideal for producing these high-end materials.
Large-section billets: When producing very large-section billets (such as ingot substitutes for large forgings), the vertical structure better ensures their internal quality.
Non-ferrous metals: Widely used in the continuous casting of non-ferrous metals such as copper and aluminum, also to obtain high-quality, defect-free ingots.
Comparison with mainstream continuous casting machines (understanding its application scenarios)
To better understand its advantages, it can be compared with the currently mainstream arc continuous casting machines:
| Features | Vertical continuous casting machine | Arc-shaped continuous casting machine |
| Equipment Height | Very high (up to tens of meters) | Relatively short, small footprint |
| Infrastructure Costs | High, relatively low, slow casting speed | Relatively low |
| Production Efficiency | Excellent, no bending cracks, high purity | High, enabling high-speed continuous casting |
| Bill Quality | High-end, high value-added, crack-sensitive steel grades | Good performance, but there is a risk of bending/straightening cracks, and inclusions accumulate in the inner arc |
| Applicable Steel Grades | Vertical continuous casting machine | Suitable for bulk steel products such as plain carbon steel and low alloy steel |
Disadvantages of Vertical Continuous Casting Machines (Why They Aren’t Mainstream)
Despite their quality advantages, significant drawbacks limit their widespread adoption:
High investment and construction costs: Extremely high costs for plant construction and deep foundations.
Lower production efficiency: Casting speeds are typically lower than those of arc casting machines.
Inconvenient maintenance: The towering size of the equipment makes maintenance and operation of the upper area difficult.
Summary
The greatest advantage of vertical continuous casting machines lies in their ability to produce high-end steel and alloys with extremely high internal quality, purity, and no bending cracks. It is a “quality-oriented” machine. Although it has been replaced by the more economical and efficient arc casting machines in the large-scale production of ordinary steel, vertical continuous casting machines still play an irreplaceable role in the fields of special steel, high-alloy steel, and cutting-edge materials with zero tolerance for internal defects.
