The protective coating made of air-setting concrete of chrome-magnesite composition protects the lining of forked and single steel-discharge gutters from the effects and penetration of molten metals and slags.
The chemical inertness toward basic and fireclay refractories enables us to use the chrome-magnesite coating to protect concrete and brick linings of steel discharge gutters made of basic and fireclay refractories.
The capacity of chrome-magnesite concrete based on magnesium-sulfate to become friable at 700–1100°C facilitates easy removal from the gutter of the slag and metal residues built up on the weakened zone of the protective layer.
Easy restoration of the protective layer with chrome-magnesite mortar enabled us to introduce protective coatings at the North Steel plant without considerable expense and the use of equipment.
Restoration of the concrete coating after each heat increased the life of the firebrick lining.
The method proposed for increasing the life of the lining of forked and single gutters can be used in any steel plant.