Ramming Mass for Induction Furnaces

Ramming mass is a granular dry refractory mix that is rammed in place, typically by pneumatic vibrators, to form a monolithic lining. The most common use is induction furnace linings for melting iron, steel, copper and brass. It is also used for steel ladle bottoms, blast furnace troughs and EAF bottoms.

Silica ramming mass is the standard for iron and carbon steel induction furnaces, economical, good thermal shock, and compatible with acidic iron slags. Alumina-based mass is used for stainless steel and special alloys where silica pickup must be avoided. Magnesia-based mass is used for high-manganese steel and copper alloys where basic slags are present. Choosing the wrong chemistry causes rapid lining failure.

A 1–5 tonne capacity iron-melting induction furnace with silica ramming mass typically gives 100–250 heats per lining. Steel melting reduces life to 50–120 heats due to higher temperature. Lining life depends heavily on ramming density, sintering practice, charge cleanliness, holding time and operator discipline. Poor ramming can cut life by 50%.

Standard sequence: install dry, ram to specified density, install template former, slowly heat to 600°C over 4–6 hours to remove free moisture, hold 2 hours, then ramp to 900°C and hold 3 hours to develop crystobalite (for silica). First melt should be at moderate power. Avoid full power and slag formation until at least 5 heats have run. Skipping sintering halves lining life.

Yes, silica, alumina and magnesia ramming mass are supplied in 25 kg bags, with quantities calculated against your furnace cross-section. A typical 5-tonne iron-melting furnace requires 3–4 MT of silica ramming mass per lining. We supply silica and alumina grades, including CUMI neutral ramming mass, with technical guidance from our induction furnace specialists.

Pricing is per metric tonne in 25 kg bags. Silica ramming mass is the most economical. Alumina ramming mass is roughly 2× silica price, and magnesia ramming mass is 3–4× silica price. Premium grades with higher purity (>99% SiO₂ for silica) carry an additional 20–30% premium. Send us your furnace size and steel grade and we will quote a complete lining package.