Forsterite uses natural olivine and medium grade and sintered
magnesia as raw material, light burned magnesia powder, silica powder, Guangxi
white mud, talc as binding agent and additives.
It has been proved that the service life of forsterite coating
material and magnesia coating material are almost the same, which is 10-14
hours. After 10-14 normal using in CCM, the sintered layer thickness is mostly
less than 30mm, which is about 10mm less than that of magnesia coating
material. It means the thermal insulation performance of forsterite coating
material is better. It is not likely to be sintered with permanent layer, which
is easy for separation between the two layers. During the drying and preheating
stage, the carbonate and sulfate in the raw material are decomposed and
evaporated, so there will be no hydrogen absorption, recarburation or
resulfurization during the tapping of molten steel. There is a stable spinel
adhesive layer formed after the forsterite coating material is in touch with
molten steel, which can prevent secondary oxidation of molten steel.
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