Product Overview
Small-diameter graphite electrodes (75mm–150mm) are widely used in electric arc furnaces (EAFs), ladle furnaces (LFs), and industrial heating systems requiring high current density and stable performance. These electrodes are manufactured from premium needle coke and undergo strict quality control to ensure low resistivity, high mechanical strength, and thermal shock resistance.
Product Characteristics
|
Property |
UHP Specification |
Advantage vs HP-Grade |
|
Resistivity (μΩ·m) |
3.5-5.0 |
30% lower |
|
Flexural Strength (MPa) |
≥16 |
25% higher |
|
CTE (×10⁻⁶/°C) |
0.8-1.2 |
40% improvement |
|
Current Density (A/cm²) |
35-45 |
50% increase |
|
Oxidation Loss (kg/ton) |
0.8-1.2 |
60% reduction |
Key Features
✔ High Conductivity – Low resistivity (≤8 μΩ·m for RP, ≤6 μΩ·m for UHP) ensures efficient power transmission.
✔ Thermal Stability – Withstands temperatures up to 1500°C+ without deformation.
✔ Precision Machining – Smooth surface and ISO-standard threads (3/4 taper or 1/5 taper) for secure connections.
✔ Oxidation Resistance – Optional anti-oxidation coating (Al-Si based) extends lifespan in high-temperature environments.
✔ Mechanical Strength – Flexural strength ≥10 MPa (RP) to ≥18 MPa (UHP) prevents breakage under stress.
Available Grades & Specifications
|
Grade |
Resistivity (μΩ·m) |
Flexural Strength (MPa) |
Current Density (A/cm²) |
Typical Applications |
|
RP (Regular Power) |
8–12 |
10–14 |
15–20 |
Small EAFs, silicon metal furnaces |
|
HP (High Power) |
6–8 |
14–16 |
20–25 |
Medium EAFs, steel refining |
|
UHP (Ultra-High Power) |
≤6 |
≥18 |
25–30+ |
High-efficiency steelmaking, LF furnaces |
Standard Sizes:
Diameter: 75mm, 100mm, 125mm, 150mm
Length: 300mm–1200mm (customizable)
Thread Types: 3/4 taper (common), 1/5 taper (for tighter fit), parallel (special applications)
Applications
✅ Steelmaking – Small electric arc furnaces (EAFs) and ladle furnaces (LFs) for steel refining.
✅ Non-Ferrous Metals – Melting copper, aluminum, and zinc alloys in induction furnaces.
✅ Industrial Silicon & Ferroalloys – Used in submerged arc furnaces (SAFs) for silicon metal, ferrosilicon, and calcium carbide production.
✅ Specialty Chemicals – Yellow phosphorus, corundum, and boron carbide manufacturing.
✅ Laboratory & High-Temperature Heating – Research furnaces, CVD reactors, and sintering applications.
Advantages Over Competing Materials
|
Feature |
Graphite Electrode (75–150mm) |
Carbon Electrode |
Metal Electrode |
|
Conductivity |
★★★★★ (Low resistivity) |
★★★☆☆ |
★★★★☆ |
|
High-Temp Resistance |
★★★★★ (Up to 3000°C) |
★★★☆☆ |
★★☆☆☆ (Melts at high temps) |
|
Thermal Shock Resistance |
★★★★☆ |
★★☆☆☆ |
★☆☆☆☆ |
|
Oxidation Resistance |
★★★★☆ (with coating) |
★★☆☆☆ |
★☆☆☆☆ |
|
Cost Efficiency |
★★★★☆ (Long lifespan) |
★★★☆☆ |
★★☆☆☆ |
Installation & Maintenance Tips
Torque Requirements:
RP/HP: 150–300 N·m
UHP: 300–450 N·m
Storage: Keep in dry conditions to prevent moisture absorption.
Lifespan Extension: Use anti-oxidation spray in high-oxygen environments.
Why Choose Our 75–150mm Graphite Electrodes?
✔ Strict QC: Every batch tested for resistivity, density, and strength.
✔ Customization: Tailored diameters, lengths, and thread types available.
✔ Fast Delivery: Ready stock for standard sizes.
✔ Technical Support: Expert guidance on electrode selection and furnace optimization.