UHP 400mm Graphite Electrodes
- UHP 400mm Graphite Electrodes are specifically designed for use in Electric Arc Furnaces (EAF) and Ladle Furnaces (LF), offering superior performance in steelmaking.
UHP 400mm Graphite Electrodes for Electric Arc Furnace and Ladle Furnace Steelmaking
UHP 400mm Graphite Electrodes from ShanChun® Carbon are engineered for electric arc furnace (EAF) steelmaking and ladle furnace (LF) refining operations. With a nominal diameter of 400 mm (actual diameter approximately 406 mm), this specification is widely used in AC and DC electric arc furnaces with capacities ranging from 40 to 100 tonnes, where current density, arc stability, and electrode consumption directly influence steelmaking productivity and operating cost.
As part of ShanChun® Carbon’s complete Graphite Electrode product range, UHP 400mm Graphite Electrodes are widely used in medium-capacity electric arc furnaces and ladle furnace operations. For steelmakers planning furnace upgrades or higher transformer power inputs, larger specifications such as UHP 450mm Graphite Electrodes and UHP 500mm Graphite Electrodes may also be considered based on furnace capacity, transformer rating, and operating current requirements.
ShanChun® Carbon also supplies matching Graphite Electrode Nipples manufactured to strict dimensional and electrical tolerances, ensuring reliable current transfer, low joint resistance, and stable column performance throughout the steelmaking process. Explore our complete Graphite Electrodes range for additional diameter options and technical specifications.
Raw Materials and Manufacturing Process
The UHP (Ultra High Power) classification is determined by both raw material quality and manufacturing process control. ShanChun® UHP 400mm Graphite Electrodes are manufactured from 100% petroleum needle coke, a highly crystalline carbon material with low thermal expansion characteristics and the structural anisotropy required for ultra-high-power furnace operation.
Unlike RP and HP grades, which may incorporate calcined petroleum coke blends, UHP electrodes require high-grade needle coke to achieve the electrical conductivity, thermal shock resistance, and mechanical strength demanded by modern steelmaking furnaces.
The manufacturing process:
Calcination
The manufacturing process begins with high-temperature calcination, which removes residual volatile matter and stabilizes the crystalline structure of the needle coke before forming. This stage improves raw material consistency and prepares the coke for subsequent processing.
Kneading and Extrusion
Following calcination, the needle coke is mixed with coal tar pitch binder and processed through kneading and extrusion. During this stage, the elongated needle coke crystallites become preferentially aligned along the electrode axis, reducing axial electrical resistivity and improving current-carrying performance.
Baking, Impregnation and Re-Baking
After forming, the electrode blanks undergo primary baking, pitch impregnation, and secondary baking. This process reduces open porosity, increases bulk density to ≥1.65 g/cm³, and enhances resistance to oxidation and thermal stress during furnace operation.
Graphitization
The baked electrodes are graphitized at temperatures exceeding 2,800°C in an Acheson graphitization furnace. This critical stage completes the graphitization process, producing the low electrical resistivity and high thermal conductivity required for UHP-grade performance.
Precision CNC Machining
The final stage involves CNC machining of both the electrode body and nipple socket to tolerances as tight as ±0.05 mm. Precise machining ensures accurate thread engagement, reliable torque transmission, and stable alignment throughout the electrode column during high-power steelmaking operations.
