Refractory material for tundish

In recent years, we have successively developed low-carbon and carbon-free magnesia dry material working linings for tundishes, new flow stabilizers for tundishes, which are specially used for the production of low-carbon steel, ultra-low carbon steel, high-quality silicon steel and other high-end plates. Carbon-free and low-silicon covering agent for tundish, low-carbon and low-silicon double-layer covering agent for high-quality silicon steel, etc.
The carbon-free dry material used in the tundish is made of high-quality sintered magnesia as the aggregate, and inorganic salt is used as the binder, which removes the traditional phenolic resin binder. It is used on the slab tundish of Shougang Jingtang Iron and Steel, and the tundish non-carbon and low-silicon covering agent developed by our company not only greatly reduces the carbonization of the molten steel by the working lining, but also plays an important role in stably controlling the carbonization of the molten steel. good effect.

In order to better develop refractory materials for tundish, better serve the continuous casting of steel mills, and develop forward-looking refractory materials suitable for tundish use, the company aims at the flow field of molten steel in the tundish and the temperature distribution of molten steel in each part. and the flow field after using the flow stabilizer, etc., and cooperated with Chongqing University to carry out tundish water model and numerical model research. The 68-ton single-flow slab tundish for the second phase, the 80-ton double-flow slab tundish for the new project of HBIS Group’s Laoting, the 45-ton billet tundish for the second steel-making project of Nangang, and the renovation of the 2# machine of the No. According to the numerical and model research of tundish of ton bloom, various new-type flow stabilizers, slag retaining walls and other products have been developed to meet the needs of steel mills.

Insulation layer (nano board, refractory fiber board)

This layer is next to the tundish steel shell, and its material is usually asbestos board, thermal insulation brick or lightweight castable.

Permanent layer (castable)

The permanent layer is in contact with the thermal insulation layer, and steel fiber reinforced high-aluminum self-flowing castables are generally used. The castable can be vibrated for construction or self-flow construction, and the construction is convenient. It has the advantages of high strength, thermal shock resistance and corrosion resistance. In the production environment of continuous continuous casting, it can be used together with the working layer of the tundish to prolong the service life of the tundish in the case of continuous casting for a long time.

The thickness of the permanent layer is generally 130-170mm, and the life span is from half a year to more than one year.

Working layer (dry material, spread material)

There are two main types of tundish working layers: spread and dry

The smear is mainly composed of sintered magnesia, high-purity magnesia or fused magnesia, binder, plasticizer and fiber components. It has the advantages of good viscosity, high adhesion rate and corrosion resistance.

The main raw materials of dry material are sintered magnesia, high-purity magnesia and fused magnesia, and phenolic resin (dry powder) and inorganic salt are used as binders.

Current Stabilizer, Impact Plate

The main raw materials are sintered magnesia, fused magnesia, super high alumina bauxite, synthetic magnesia-aluminum spinel, synthetic magnesia-chrome sand, etc., with SiO2 and Al2O3 ultrafine powder as binders. It has strong resistance to erosion and slag erosion. The impact cup improves the flow field distribution of the molten steel in the tundish, thereby improving the quality of the slab.

Slag Retaining Wall, Slag Retaining Dam

The main raw materials are sintered magnesia, fused magnesia, super high alumina bauxite, synthetic magnesia-aluminum spinel, synthetic magnesia-chrome sand, etc., with SiO2 and Al2O3 ultrafine powder as binders. It has strong resistance to erosion and slag erosion.