A tundish well block, also known as a tundish impact pad or tundish bottom refractory, is a specialized refractory material used in the steelmaking industry. It is located at the bottom of the tundish, which is an intermediate vessel used to distribute molten metal from the ladle to the molds during continuous casting processes. Here's what you need to know about tundish well blocks:
Purpose: The primary purpose of a tundish well block is to provide a durable and heat-resistant lining at the bottom of the tundish. It acts as a protective barrier between the molten metal and the tundish structure, preventing damage and ensuring the efficient and controlled flow of the molten metal.
Material composition: Tundish well blocks are typically made from high-quality refractory materials, such as magnesia carbon, alumina magnesia carbon, or alumina graphite, depending on the specific tundish design and casting requirements. These materials offer high-temperature resistance, excellent thermal shock resistance, and good resistance to erosion.
Impact resistance: Tundish well blocks must withstand the impact and turbulence caused by the molten metal entering the tundish. They are designed to handle the thermal and mechanical stresses during the casting process, preventing damage or spalling.
Thermal stability: Tundish well blocks are exposed to high temperatures, typically ranging from 1,500°C to 1,700°C (2,732°F to 3,092°F), during the steel casting process. They must have excellent thermal stability, maintaining their strength and structure even at extreme temperatures.
Erosion resistance: Tundish well blocks are subjected to the erosive action of the molten metal and slag. They are engineered to have good erosion resistance, minimizing wear and extending the service life of the tundish lining.
Chemical resistance: Tundish well blocks come into contact with the molten metal, slag, and various chemicals present during the casting process. They are formulated to have good chemical resistance, ensuring they do not react or deteriorate when exposed to these substances.
Installation and maintenance: Tundish well blocks are installed and maintained by skilled technicians using specialized techniques and equipment. Proper installation and regular inspections are crucial to identify and repair any damage or wear in the lining, ensuring the tundish's performance and longevity.
Customization: Tundish well blocks can be customized to meet specific tundish designs and operating conditions. The size, shape, and composition of the well block can be tailored to optimize its performance and fit within the tundish structure.
Tundish well blocks play a crucial role in the continuous casting process, ensuring the efficient and controlled flow of molten metal from the ladle to the molds. Their high-temperature resistance, thermal shock resistance, impact resistance, and erosion resistance contribute to the reliable and consistent operation of tundishes in steel production.
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| ITEM | Index | |||||
| SD-WB85 | MGM-WB90 | MGM-WB95 | MGM-WBC80 | MGM-WBC95 | ||
| Chemical Ingredients % ≥ | Al2O3+MgO | 85 | 90 | 93 | 80 | 85 |
| Cr2O3 （C） | 0 | 2.5 | 2.5 | 4 | 3 | |
| A.P. % ≤ | 15 | 13 | 13 | 6 | 6 | |
| B.D.g/cm³≥ | 3.00 | 3.05 | 3.10 | 3.00 | 3.05 | |
| Normal Temperature Compressive Strength . Mpa ≥ | 80 | 100 | 100 | 60 | 60 |