Smelting Materials for Steelmaking Electric Arc Furnaces

author: Alice

2025-08-26

The primary smelting material in steelmaking electric arc furnaces is steel scrap. A certain amount of molten iron and auxiliary additives, such as lime, limestone, and dolomite, may also be added to the slag to adjust its alkalinity and composition. Graphite electrodes are required as conductive materials to generate the arc and heat the charge, conducting the current into the furnace.

The smelting process includes:

Preparing the raw materials, including molten iron, scrap steel, and auxiliary materials;
Smelting the raw materials into molten steel in an electric arc furnace. The double-slag method first produces a high-alkalinity, highly oxidizing slag, which is then dephosphorized, decarbonized, and degassed, and then heated to a reduction-refining stage.

EAF steelmaking electric furnaces technology allows for precise control of the smelting process, enabling efficient metal re-evaluation and reducing raw material usage. Different raw material ratios and smelting methods affect the quality and properties of the final steel.

Smelting Materials of Steelmaking Electric Arc Furnaces

Scrap:

The primary raw material for electric arc furnaces steelmaking can be high-quality scrap steel, low-cost scrap steel, or pig iron. The type and ratio of scrap steel affect the quality and composition of the final molten steel.

Molten Iron:

EAF smelting typically uses scrap steel, with the ratio adjusted based on actual needs.

Slag-Forming Materials:

In order to stabilize the arc, control the molten steel composition, and remove impurities, lime, dolomite, calcite powder, and other materials are added to form a foamy slag during the operation of the steelmaking electric furnaces.

Other Important Materials:

Graphite Electrodes: Graphite electrodes are used as a conductive material in the electric arc furnace. They heat the charge by generating an arc between the lower end of the electrode and the metal charge. Graphite electrodes are made from materials such as petroleum coke and pitch coke, offering excellent conductivity and high-temperature resistance.

The Role of Materials in the Electric Arc Furnace Process

Heating & Melting:

The intense arc generated by the graphite electrodes directly heats the charge, melting it into molten steel.

Composition Adjustment:

During the melting process, other materials can be added as needed to achieve the desired chemical composition of the molten steel.

Deoxidation & Desulfurization:

Steelmaking electric arc furnaces use slag-forming materials to form alkaline or acidic slag, which effectively removes harmful impurities such as oxygen and sulfur from molten steel.

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