The blasting material is a dry material composed of corundum, micro powder and chromium oxide green. The construction part of the charge is different, and the construction method is also slightly changed.

When the bottom of the furnace is tied, the thickness of the bottom of the furnace is 280mm, which should be divided into four times of filling and punching, and the uneven density should be prevented when the artificial knot is tied, therefore, the thickness of the charging material must be strictly controlled. Generally, the thickness of the charging material is not more than 100mm when the charging material is tied, the thickness of the furnace wall is controlled within 60mm, and the charging material should be slowly rotated around the furnace and replaced with uniform force.

When the charge is knotted at the bottom of the furnace to the required height, it needs to be scraped flat before placing the crucible die. The crucible die is concentric with the induction ring, and is closely combined with the bottom of the furnace when it is adjusted vertically up and down, and then the surrounding gap is adjusted to be equal, and the wooden wedge is fastened, and the middle weight is pressed on to avoid the displacement of dry material when the furnace material is knotted on the furnace wall.

When tying the furnace wall, the thickness of the furnace charge is 110-120mm, and the furnace charge should be added in batches, with uniform distribution at the same time, and the thickness of the furnace charge should not be more than 60 mm each time, until it is flush with the upper edge of the induction ring. The crucible die does not need to be removed after knotting, so that the furnace charge can play an induction heating role during drying and sintering.

The baking and sintering process is roughly divided into two stages, so that the furnace lining compact bond structure of the charge is stronger.

Beat the charge to bake... Stage: Heating to 100℃ at the speed of 50℃/h, insulation for 2h, heating to 300℃ at the speed of 100℃/h, insulation for 2h, the purpose is to completely eliminate the water in the furnace lining.

The second stage of blasting charge sintering: 200℃/h heating to 900℃, heat preservation for 2h, 100℃/h heating to 1200℃, heat preservation for 2h,... Molten steel is kept at 1400-1650 degrees for 1 hour to control the heating rate and prevent cracks.