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Self-flowing casting material , applicable to steel ladle, EAF, tundish, BOF

2025-11-05

Self-flowing refractory material :

The basic formula uses high-purity magnesia (MgO≥95%) as the main aggregate, with a grading of 4-1mm, 1-0.5mm, <0.08mm, accounting for 68% of the total. The binder system uses a mixture of silica micro powder (Si02292%) and active αA120: nano powder, with a ratio of 7:3, achieving a flow value of 140mm. Environmental protection additives use boric acid complex to replace traditional chromium salts, which can promote the development of forsterite crystal phase at 1350℃ sintering, and the porosity is controlled 14%. The compressive strength (1500℃x3h) is 245MPa, the room temperature flexural strength is >6Pa, and the linear change rate is kept within ±0.5%. A report from an institute shows that the T-3 type formula sample has a penetration layer thickness of 2.1mm in the slag erosion test of a converter with a ternary alkalinity of 1.8, which is significantly better than the traditional material's4.5mm test value.

Characteristics of magnesia self-flowing refractory:

1 Improve the service life of the furnace liningSince magnesia self-flowing refractory has a high slag-mud water-breaking ability, it can effectively reduce the degree of slag erosion, so use of magnesia self-flowing refractory can effectively improve the service life of the furnace lining.
2 Improve the shedding phenomenon of the furnace lining sl bag
In steelmaking production, the shedding phenomenon of the furnace lining slag bag often occurs, which seriously endangers the safety of smelting. The use of magnes self-flowing refractory can improve this phenomenon to a certain extent, ensuring the safe and stable progress of smelting.
3 Improve the quality of steelThe content of hydrogen in steel has a very adverse effect on the quality of steel, which can easily lead to the appearance of pores and longitudinal cracks on the surface of steel. The of magnesia self-flowing refractory can reduce the content of hydrogen in steel, thus improving the quality of steel.

Key process parameters control during construction
water added on site must be strictly controlled within the range of 4.8-5.2%, and the mixing time should not be less than 18 seconds. When pouring, the pouring height should be controlled layer by layer, and the thickness of a single layer of pouring should be kept within 400mm, with the time between layers limited to 30-45 minutes. Practice data from a steel mill show that when the curing temperature is maintained at 40℃±5 and humidity is >75%, the burst rate during the furnace drying period is reduced from 1.8% to 0.3% compared to traditional processes.

Application of self-flowing refractory products:

1. Iron and steel industry

High blast furnace molton iron ladle, steel ladle, EAF, BOF

Continuous casting tundish working layer

Arc furnace cover, furnace wall, furnace bottom

2. Non-ferrous metallurgy industry

Alumin electrolytic cell side wall, furnace lining

Copper smelting reverberatory furnace, converter

3. Cement, petrochemical industry

C rotary kiln cooler, decomposition furnace, kiln mouth iron ring

Waste incinerator, petrochemical cracking furnace lining

4. Electric power industry
Coal-fired boiler combustion chamber, flue, cyclone separator lining