Overview
Steel casting slag-stopping cotton is a specialized refractory material designed for foundry applications. Composed of high-purity alumina-silicate fibers, it serves as a physical barrier between molten steel and slag during casting operations. The material's unique structure allows it to withstand extreme temperatures while effectively preventing slag contamination in the final steel product. Developed specifically for steel foundries, this product represents a crucial quality control measure in modern metallurgical processes. Its use has become industry standard in both continuous casting and ingot casting operations, significantly improving steel purity and reducing defects in finished products.
Physical and Chemical Properties
The slag-stopping cotton exhibits exceptional thermal stability, maintaining structural integrity at temperatures exceeding 1600°C. Its low thermal conductivity helps prevent premature solidification of molten steel, while the fibrous structure provides effective filtration of slag particles. The material is chemically inert to molten steel and most slag compositions. Typical physical characteristics include a porosity of over 90% and a specific surface area ranging from 0.5-2 m²/g. These properties combine to create an efficient barrier that traps slag particles while allowing molten metal to flow through. The material's amorphous structure contributes to its thermal shock resistance, a critical property in foundry applications.
Main Applications
Primary use occurs in steel casting operations where it's placed at strategic points in the casting system to intercept slag. Common application points include tundish well blocks, stopper rod systems, and submerged entry nozzles. The cotton effectively separates slag from molten steel during the teeming process. The material also finds use in secondary metallurgy processes and special alloy production where slag contamination must be minimized. Some foundries employ it as part of their quality assurance protocols for high-grade steel production, particularly for applications requiring exceptional purity such as bearing steels or aerospace components.
Safety and Storage
While non-toxic, the fibrous nature requires careful handling to prevent respiratory irritation. Proper storage involves keeping the material in its original packaging until use, protected from moisture and mechanical damage. Bulk storage should maintain stack heights below specified limits to prevent compression damage. When installing in casting systems, workers should wear appropriate PPE including heat-resistant gloves and eye protection. Spent material should be allowed to cool completely before disposal, following local regulations for refractory waste. Proper installation techniques are crucial to ensure optimal performance and worker safety during casting operations.
B2B Procurement Guide
Industrial buyers should evaluate suppliers based on material consistency, temperature resistance specifications, and batch-to-batch uniformity. Key procurement considerations include fiber diameter distribution (typically 3-5 μm), aluminum oxide content (usually 45-55%), and shrinkage rates at operating temperatures. Large-scale purchasers should request factory audits and quality certifications such as ISO 9001. Minimum order quantities often apply, with typical industrial packages ranging from 500kg to multi-ton shipments. Lead times vary seasonally, so advance planning is recommended, especially before peak production periods. Many suppliers offer technical support for installation optimization and performance testing.
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