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300mm HP Graphite Electrode – High Power Solution for Arc Furnaces
The 300mm HP graphite electrode is designed for Electric Arc Furnaces, Ladle Furnaces, and Submerged Arc Furnaces in steel and ferroalloy production. It performs reliably under high-temperature and high-current conditions, offering stable conductivity, low thermal expansion, and high melting efficiency—ideal for demanding metallurgical environments.
Description
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Product Overview
The 300mm High Power (HP) graphite electrode is designed for use in medium- to high-capacity Electric Arc Furnaces (EAF), Ladle Furnaces (LF), and Submerged Arc Furnaces (SAF) for the production of steel and ferroalloys. Made from premium petroleum needle coke and high-purity coal tar pitch, HP-grade electrodes provide superior electrical conductivity, excellent thermal resistance, and high mechanical strength under elevated current loads—significantly outperforming RP (Regular Power) grades.
Through ultra-high temperature graphitization (>2800 °C) and CNC-precision machining, these electrodes ensure reduced consumption rates, stable arc performance, and extended service life, even in demanding thermal and electrical environments.
HP Graphite Electrode Parameters — 300mm
| Item | Unit | Electrode | Nipple |
| Resistivity | μΩ·m | 5.2 ~ 6.5 | 3.5 ~ 4.5 |
| Bending Strength | MPa | ≥ 11.0 | ≥ 20.0 |
| Elastic Modulus | GPa | ≤ 12.0 | ≤ 15.0 |
| Bulk Density | g/cm³ | 1.68 ~ 1.73 | 1.78 ~ 1.83 |
| Thermal Expansion CTE | 10⁻⁶/℃ | ≤ 2.0 | ≤ 1.8 |
| Ash Content | % | ≤ 0.2 | ≤ 0.2 |
| Allowable Current | A | — | 13000–17500 |
| Current Density | A/cm² | — | 17–24 |
| Actual Diameter | mm | Max 307 Min 302 | — |
| Actual Length | mm | 1800 customizable | — |
| Length Tolerance | mm | ±100 | — |
| Short Length | mm | — | — |
Core Features & Advantages
● Superior Electrical Conductivity
Lower resistivity ensures minimal power loss and stable arc behavior during high-load operations.
● Outstanding Thermal Shock Resistance
Low thermal expansion mitigates cracking risks under rapid temperature shifts.
● High Mechanical Integrity
Elevated flexural and compressive strength reduce breakage during handling and melting.
● Ultra-Low Impurity Levels
Tight control over ash, sulfur, and volatile content enables cleaner steelmaking with reduced slag formation.
● Precision Thread Machining
CNC-machined threads ensure perfect electrode-nipple alignment, minimizing joint resistance and wear.
Typical Application Scenarios
● Electric Arc Furnace (EAF) Steelmaking
Ideal for melting scrap and alloy steel with medium to high current loads.
● Ladle Furnace (LF) Refining
Suitable for secondary refining where temperature precision and low impurity transfer are essential.
● Submerged Arc Furnace (SAF)
Applied in the production of silicon manganese, ferrochrome, and calcium carbide under sustained high heat.
● Foundry & Non-Ferrous Metallurgy
Used in refining aluminum, copper, and other non-ferrous metals with strict purity requirements.
Manufacturing Process & Quality Assurance
● Raw Material Selection
High-grade petroleum needle coke with low sulfur and volatility provides a dense, uniform carbon matrix.
● Forming & Baking
Electrodes are isostatically pressed and baked at ~900 °C to strengthen the carbon structure.
● Graphitization
Heat treatment above 2800 °C converts carbon to crystalline graphite, enhancing conductivity and heat resistance.
● Precision CNC Machining
Tolerances are strictly controlled for thread integrity and dimensional precision (3TPI, 4TPI, M60x4).
● Testing & Certification
Every batch is tested via ultrasonic inspection, resistivity analysis, and mechanical property verification, complying with ASTM C1234, IEC 60239, and GB/T 20067 standards.
End-User Benefits
● Lower Electrode Consumption (ECR)
High bulk density and durability reduce electrode replacement frequency and overall costs.
● Improved Energy Efficiency
Low resistivity supports lower kWh/t energy consumption and better furnace economics.
● Stable Furnace Operation
Reduced arc interruption and joint failures enhance uptime and operational reliability.
● Cleaner Melting Processes
Low impurity levels improve alloy quality and reduce slag-related losses.
Conclusion
The 300mm HP graphite electrode delivers an optimal combination of performance, efficiency, and durability for steelmakers and alloy producers operating medium- to high-power arc systems. With advanced thermal and electrical properties, precision engineering, and reliable structural performance, this electrode ensures consistent melting, reduced consumption, and superior metallurgical results.
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