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Graphite Electrode

  • Introduction
  • Product Size
  • Application
  • Specification

1

Introduction

High Bending Strength – We have strict management on the quality and composition of purchasing raw materials. We use the 3500 ton and 4100 ton extruding machine to expand the bending strength capacity of the graphite electrodes.

High Thermal Conductivity – We have established an optimal balance that brings a smaller thermal expansion and higher thermal conductivity.

Machined with high precision and have low contact resistance between electrodes and holder.

The graphitization workshop are equipped with 35KV and 110KV high-voltage transformer, which ensures the optimization of the electrode conductivity.

Product Size

Size of Graphite Electrodes (RP, HP, UHP)
Type

 

 Diameter Length Allowable Variation
Off-Size Length
Inch Max(mm) Min(mm) mm Length (mm) Max (mm) Min (mm)
#350 14 357 352 1800 2000 2100 ±100 -100 -275
#400 16 409 403
#450 18 460 454
#500 20 511 505 2000 2100 2250 2400 2700 ±100 -100 -275
#550 22 562 556
#600 24 613 607
#700 26 714 708 2400 2700 ±100 -100 -275

 

Size of Graphite Electrodes with Nipples (3 threads per inch)
Electrodes Nipples
Φ(mm) Screwing Depth (mm) IEC Designation Length(mm) Φ(mm) Weight(kg)
350 153 215T3N 304.8 215.90 14.50
350 181 215T3L 355.6 215.90 17.50
400 153 215T3N 304.8 215.90 14.50
400 170 241T3N 338.7 241.30 20.00
400 181 241T3L 355.6 241.30 21.00
450 170 241T3N 338.7 241.30 20.00
450 181 273T3N 355.6 273.05 28.00
450 233 273T3L 457.2 273.05 32.50
500 181 273T3N 355.6 273.05 28.00
500 233 273T3L 457.2 273.05 32.50
550 187 298T3N 372.4 298.45 35.00
550 233 298T3L 457.2 298.45 43.00

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Electrodes can be supplied with or without preset nipples， and we can also supply special nipples transfer adapters. The graphite electrodes are supplied default with a unscrewing prevent system. Long nipples are recommended, which help to reduce the collar break rate.

Application

  1. Graphite electrodes are mainly used in electric arc furnaces for steelmaking.
  2. The submerged electric furnace used for smelting and producing industrial silicon metal and yellow phosphorus, about 100kg of graphite electrode is needed for producing 1ton of industrial silicon metal, and about 40kg of graphite electrode is needed for producing 1ton of yellow phosphorus.
  3. Graphite electrodes are used in resistance furnaces to produce graphite, molten glass, and silicon carbide, etc.
  4. The graphite electrode blanks are used to process various graphite products, such as crucibles, molds, capacitor tubes, and quartz bricks.

 

Specification

Technical Indicators of RP (regular power) Graphite Electrodes
Items Parts Actual Indicators By Diameters Range
Φ 350 – 450mm Φ 500 – 600mm
Resistance Value (μΩ.m) Electrode ≤9.0 ≤9.5
Nipple ≤6.5 ≤6.5
Bending Strength (Mpa) Electrode ≤7.0 ≤6.5
Nipple ≤13.0 ≤13.0
Elastic Modulus (Gpa) Electrode ≤8.0 ≤8.0
Nipple ≤12.0 ≤12.0
Bulk Density (g/cm³) Electrode ≥1.60 ≥1.60
Nipple ≥1.80 ≥1.80
GTE＞(100-600℃)  (10-6/℃) Electrode 2.8 2.8
Nipple 2.7 2.7
Ash % ≤0.5% ≤0.5%

 

Technical Indicators of HP (high power) Graphite Electrodes
Items Parts Actual Indicators By Diameters Range
Φ 350 – 450mm Φ 500 – 600mm
Resistance Value (μΩ.m) Electrode ≤6.0 ≤6.2
Nipple ≤4.5 ≤4.5
Bending Strength (Mpa) Electrode ≤12.0 ≤12.0
Nipple ≤20.0 ≤20.0
Elastic Modulus (Gpa) Electrode ≤10.0 ≤10.5
Nipple ≤16.0 ≤16.0
Bulk Density (g/cm³) Electrode ≥1.63-1.73 ≥1.63-1.73
Nipple ≥1.78 ≥1.78
GTE＞(100-600℃)  (10-6/℃) Electrode 2.4 2.4
Nipple 1.8 1.8
Ash % ≤0.3% ≤0.3%

 

Technical Indicators of UHP (ultra high power) Graphite Electrodes
Items Parts Actual Indicators By Diameters Range
Φ 350 – 450mm Φ 500 – 700mm
Resistance Value (μΩ.m) Electrode ≤5.5 ≤5.5
Nipple ≤3.7 ≤3.7
Bending Strength (Mpa) Electrode ≤12.0 ≤12.0
Nipple ≤22.0 ≤24.0
Elastic Modulus (Gpa) Electrode ≤12.0 ≤12.0
Nipple ≤18.0 ≤18.0
Bulk Density (g/cm³) Electrode ≥1.67-1.75 ≥1.67-1.75
Nipple ≥1.80 ≥1.81
GTE＞(100-600℃)  (10-6/℃) Electrode 1.4 1.4
Nipple 1.2 1.2
Ash % ≤0.3% ≤0.3%

 

Instructions:

  1. It’s necessary to avoid moisture, dust, dirt and collision when using or storing electrodes.
  2. When carrying the electrodes by forklift trucks, their balance should be kept to prevent slipping and breaking.
  3. The graphite electrodes should be stored in clean and dry places.
  4. Operators need clean the threads of the electrodes before connecting them, then carefully rotate the contact into one end and screw the electrode hoist into the other end.
  5. Use special torque spanner to tighten the electrode according to the instructions. And use mechanical, hydraulic or wind pressure equipment to tighten the electrode to a fixed torque.
  6. The contact surface between the holder and the electrode should be cleaned regularly to maintain good contact with the electrode, and the cooling water of the holder must be prohibited from leaking.

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