Neutral lining material LFS-885CR

 General Information 

LFS-885CR neutral lining material is composed of primary raw materials such as ** * corundum, magnesia-aluminum spinel and electromolten chromium oxide, plus other additives, after strict process preparation. This product is dry ramming refractory material, can be used as coreless induction furnace lining material, has excellent resistance to molten steel and slag erosion, suitable for melting alloy steel and stainless steel and other harsh melting environment.

Good thermal shock resistance

No cracking, no peeling

Good corrosion resistance to liquid steel

High temperature resistance

Good resistance to slag erosion

Physical and chemical indicators (Technical Data)

Standard Packaging and Storage

Packed in 25kg multi-layer paper bags; Keep in a dry place to prevent moisture absorption. The recommended storage period is not more than 6 months.

Typical Sintering parameters (Sintering Data)

Sintering temperature 1680℃ for 1~2 hours

Heating rate 200℃/ hour

Specific reference to the construction and baking process provided by our company

Neutral lining material Standard oven process and precautions

1. Oven technology

(1). The support of the inner tank is required during the dry ramming furnace and the oven, and the inner tank should be melted off during the oven. It is recommended that in addition to the R Angle at the bottom of the design, the upper and lower mouths should be the same size, and the thickness of the steel inner liner should be 5~10mm according to the furnace size.

(2) Before the oven, fill the furnace with small material and fill it to avoid the phenomenon of local ignition in the furnace and melt the inner liner so that the dry material collapses. During the heating process, the steel mold should be strictly observed, and the current should be reduced when the arc is serious. If the current is too large, it will cause the steel mold to be broken down by the arc and lead to the collapse of the refractory.

(3) During the heating process, the intermediate frequency furnace gradually increases the current, and the heating speed is controlled to be 100~400℃/ hour until the temperature in the furnace reaches 1680℃, and the heat preservation is kept at this temperature for 1~2 hours.

2. Sintering curve

The melting furnace should be filled with compacted charge before the oven and heated at the following heating rate: for furnaces larger than 2 tons, the heating rate is

100~250°C/ hour; For stoves less than 2 tons, the heating rate is 250 to 400°C/ hour.

The height of the melt should be beyond the combination of dry and wet parts, and the temperature of 1680°C for 1 to 2 hours.

3. Precautions

(1) Check the size of cooling water before power transmission, and check whether the pipeline is smooth.

(2). Stop and start the furnace precautions: when stopping the furnace, the furnace cover should be covered to keep the furnace lining material slow to cool down, so as to avoid macroscopic cracks; Turn on the furnace after shutdown... The furnace should be heated slowly, which will help to bridge the microscopic cracks and avoid the infiltration of molten steel in the refractory. When increasing the material, it is necessary to add some small material to the bottom first, so as not to damage the furnace bottom.

(3). Baking temperature: baking temperature. Fortunately, 1630~1680°C, this is conducive to the sintering of the hot surface, so as to maximize the high temperature strength of the sintering layer, to avoid the erosion and erosion of the moving melt.

(4) Oven... Furnace. It is best not to produce high alloy containing manganese, if you must melt manganese alloy, it is good to add manganese after the end of heat preservation. Because the molten steel contains manganese, it has a great influence on the fluidity of molten steel and has a great erosion effect on the furnace lining. For the addition of ferromanganese alloy, it is necessary to add it in small batches and batches in the later smelting period, and it is necessary to control the melting temperature to avoid damage to the lining caused by too high temperature.