Introduction
UHP graphite electrodes are capable of carrying a current density exceeding 25 A/cm², making them suitable for the most demanding electric arc furnace (EAF) operations. They are manufactured using high-purity raw materials, including petroleum coke, needle coke, and coal pitch, with a higher proportion of needle coke than those used in high-power electrodes. The production cycle exceeds 65 days, reflecting the complexity and precision involved.
Applications:
Primarily used in electric arc furnaces for melting fine and special steel grades, where high thermal and electrical conductivity, strength, and durability are essential.
Advantages:
Reduces energy consumption during the steelmaking process.
Extends service life, offering better value and performance in high-demand environments.
Advantage
Reduced Energy Consumption
Due to their low resistivity, UHP electrodes reduce electricity consumption by 150–200 kWh per ton of steel compared to RP electrodes, lowering carbon emissions by 12%.
Extended Service Life
An antioxidant coating (e.g., SiC–C composite), combined with low ash content, extends the electrode lifespan to up to three times that of ordinary electrodes.
Standard sizes and tolerances
UHP Graphite Electrodes
Allowable capacitance flow of the electrode
Process
Application
Large-Scale EAF Steelmaking
Applicable Furnaces: Ultra-high-power electric arc furnaces (e.g., Primetals EAF, Germany) with a capacity of 100+ tons, up to 300 tons per furnace.
Advantages:
Electrode consumption: 1.0–1.5 kg per ton of steel (vs. 2.5–4.0 kg for RP electrodes).
Smelting time: Reduced to 45 minutes per furnace (vs. 90 minutes in conventional processes).
Specialty Materials Smelting
Used for refining stainless steels (e.g., 304, 316L), nickel-based alloys (e.g., Inconel 718), and titanium alloys (e.g., TC4), with no risk of metal contamination at high temperatures.
New Energy Material Production
Serves as a core conductive component in:
Graphitization furnaces for lithium battery anode materials.
Polysilicon purification furnaces, which require 99.9999% purity.
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