ladle furnace refining
ladle refining furnace
lrf furnace

LRF Ladle Refining Furnace

LRF ladle refining furnace is the most widely used refining equipment outside the furnace at present among all types of furnaces in steel making. The LRF furnace is used to refine the molten steel melted in the primary furnace, and the ladle arc metallurgy furnace can adjust the molten steel temperature and buffer the process. 

The ladle furnace refining equipment has many advantages, such as reasonable equipment structure, reliable operation, low cost, many refined steel types, high quality and convenient operation.



 The LF furnace specification is from 8t to 300t, and has the following conditions and functions:

  • The working conditions in the LRF steel making furnace are reducing atmosphere and micro positive pressure;    

  • The electrode adjustment mode of the ladle refining furnace is three arm three-phase electrode adjustment;    

  • The thermodynamic condition of the ladle heating furnace is graphite electrode arc heating;

  • The dynamic condition is argon stirring at the bottom of the ladle;

  • This kind of submerged arc furnace process is that adding a certain amount of scrap crushing material into the ladle, heating it up with electric arc, measuring the temperature and taking samples to make the temperature control accurate, so as to optimize the pouring temperature;

  • Bottom blowing argon stirring to make the temperature of molten steel uniform, the composition uniform and the molten steel pure;

  • Slagging to remove sulfur and inclusions in molten steel;

  • Adjust the alloy composition and use the alloy feeding system to make the composition control accurate and the molten LRF steel meet the final required chemical composition;

  • Wire feeding treatment: directly feed various wires into molten steel with a wire feeder, which can significantly improve the yield of alloy;

  • Smoke exhaust and dust removal. The LRF furnace is equipped with a smoke exhaust and dust removal system, it can effectively control the smoke discharge and make the smoke emission meet the requirements of environmental protection;

  • As the ladle refining equipment outside the ladle arc furnace between the primary refining furnace and the continuous caster, it plays a buffer and regulating role in the production process of the whole workshop to ensure that molten steel with qualified temperature and composition is provided to the continuous caster.


LRF Ladle Refining Furnace Features

LRF Ladle Refining Furnace Features

The features of the LRF furnace are as follow:

  • Electrode rotation dual station;

  • Ladle turret dual station technology;

  • Online wire feeding technology;

  • Automatic temperature measurement and sampling technology;

  • The technology of adding scrap steel to refining furnace;

  • Argon blowing automatic control technology;

  • LF one touch steelmaking technology.

Benefits of the LRF Refining

The process advantages of ladle refining furnace include: strong refining function, suitable for producing ultra-low sulfur and ultra-low oxygen steel; Equipped with arc heating function, high thermal efficiency, large heating amplitude, and high temperature control accuracy; Equipped with stirring and alloying functions, the LRF furnace is easy to achieve narrow component control and improve product stability; Adopting slag steel ladle refining process with low refining cost; The ladle arc furnace is simple and requires less investment.

Ladle Refining Furnace Process Details

The refining process of a ladle refining furnace mainly includes two aspects:

Heating and temperature control. The heating rate can reach 3-5 ℃/min, and the LRF furnace adopts computer dynamic control of the endpoint temperature, which can ensure the control accuracy of the endpoint temperature (<5 ℃). The submerged arc foam technology can reduce the radiation heat loss of the arc and improve the heating efficiency of the ladle metallurgy furnace.

White slag refining process. The ladle refining furnace uses white slag for refining molten steel, achieving desulfurization and deoxidation of molten steel, and producing ultra-low sulfur steel and low oxygen steel. Therefore, white slag refining is the core of ladle furnace refining process operation and an important guarantee for improving the cleanliness of molten steel.

Ladle Refining Furnace Application

LF ladle refining furnace is an important metallurgical equipment used to refine the molten steel in the initial refining furnace (electric arc furnace, open hearth furnace, converter), and can adjust the composition and temperature of the molten steel, process buffering, and meet the production rhythm of continuous casting and rolling. The LF furnace is one of the main equipment for refining outside the furnace.

Ladle Furnace Steelmaking Equipment functions:

  • Arc heating and temperature rise under normal pressure;

  • Argon stirring (uniform composition and temperature of molten steel);

  • Slagging (desulfurization, removal of inclusions);

  • Temperature measurement and sampling;

  • Adding alloys and adjusting components;

  • Silk feeding treatment;

As an external ladle refining equipment between the electric furnace and the continuous casting machine, it plays a buffering and regulating role in the entire production process of the workshop, providing qualified steel with temperature and composition to the continuous casting machine, and achieving multi furnace continuous casting.

Ladle Furnace Refining Equipment structural form:

1)Bridge type;

2)Independent rack type;

3)Large package rotary table;

4)Cross arm rotating type;