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AGX™ Graphite Electrode Solutions

AGX™ Graphite Electrodes

GRADE AGX™ GRAPHITE ELECTRODES are the cost effective premium electrode for today’s modern, high productivity melt shops. Available in a full range of diameters, lengths, and joint designs to provide high column strength and low column performance in every furnace configuration.

For More Information

Graphite Electrodes Brochure

Application & Specifications

Recommended for high and ultra-high power AC and DC furnaces operating under severe electrical and/or mechanical conditions.

U.S. Standard Lengths and Weights

Nominal Electrode Diameter (Inches) Standard Lengths* (Inches) Typical Weight of PRE-CET™ Electrode** (Pounds) Recommended Tightening Torques (Ft. Lbs.)
10 60; 72 310; 350 300
12 72 510 450
14 72 690 600
16 72; 84; 96 900; 1010; 1220 800
18 72; 84; 96 1130; 1360; 1550 1000
20 72; 84; 96 1410; 1600; 1920 1300
22 84; 96; 110 2010; 2310; 2610 1800
24 84; 96; 110 2370; 2750; 3100 2500
26 110 3630 3300
28 110 4270 4400
30 110 4550 5900

*Typical range, property values not guaranteed.

Metric Units Lengths and Weights

Nominal Electrode Diameter (Millimeters) Standard Lengths* (Millimeters) Typical Weight of PRE-CET™ Electrode** (Kilograms) Recommended Tightening Torques (Nm)
250 1500; 1800 140; 160 390
300 1800 230 590
350 1800 310 830
400 1800; 2100; 2400 410; 460; 550 1075
450 1800; 2100; 2400 510; 620; 700 1375
500 1800; 2100; 2400 640; 730; 870 1770
550 2100; 2400; 2700 910; 1050; 1180 2460
600 2100; 2400; 2700 1080; 1250; 1410 3440
650 2700 1650 4520
700 2700 1940 6000
750 2700 2200 8000

*Typical range, property values not guaranteed.

Footnotes to Tables:

*Non-Standard lengths may be available on a made-to-order basis.

**Indicates typical AGX™ electrodes combined weights of Electrode and Connecting Pin. Weights of AGR™ electrodes are approximately 5% lower.

Your GrafTech representative is happy to discuss how each of the above combinations affect your electrode selection. Please choose the Sales Office nearest you.

UCAR® Grade AGX™ Graphite Electrodes for EAF Applications

Graphite Electrode Properties

Property Units Diameter Diameter Diameter Connecting Nipples

250 – 400 mm,

10″ – 16″

450 – 600 mm,

18″ – 24″

650 – 750 mm

26″ – 30″

Bulk Density g/cm3

1.65 – 1.75

1.65 – 1.74

1.67 – 1.75

1.73 – 1.86

Specific Resistance µΩm

4.5 – 6.0

4.1 – 5.5

4.0 – 4.9

3.4 – 4.5

Flexural Strength Tensile Strength
MPa

8.0 – 15.0

7.0 – 13.0

8.0 – 13.0

12.4 – 20.0

Kf/cm2

85 – 155

70 – 135

70 – 127

130 – 205

psi

1200 – 2200

1000 – 1900

1000 – 1800

1800 – 2000

Coefficient of Thermal Expansion X10-6/Cº

0.2 – 1.4

0.15 – 0.6

0.2 – 0.5

0-0.3

*Typical range, property values not guaranteed.

Mean CTE:

Final Temperature Degrees Celcius Added factor
100 0
200 2.0 x 10-7
300 4.0
400 6.0
500 7.7
600 9.2
700 10.4
800 11.4
900 12.3
1000 13.2
1500 17.2
2000 21.2
2500 25.2

*Typical range, property values not guaranteed.

Definitions:

Bulk Density – A measurement of weight per unit volume. A higher bulk density will generally be reflected in improved mechanical properties.

Flexural Strength – A measurement of stress required to cause rupture in bending. (Also called Bending Strength or Modulus of Rupture). Higher flexural strength in electrodes will generally result in lower electrode breakage frequency.

Note: As graphite is a brittle material, GrafTech employs the ASTM 4-Point loading method for strength testing. This method yields test values about 25% lower than those obtained by the 3-Point loading method.

Tensile Strength – A measurement of pure tensile force per unit area required to cause rupture by pulling apart. Higher tensile strength in nipples will generally result in lower nipple breakage frequency.

Graphite’s strength characteristics increase significantly with increasing temperature.

Coefficient of Thermal Expansion (CTE) – A measurement of the increase in length per unit length per degree rise in temperature. Lower CTE will generally give better resistance to thermal shock. Also, CTE compatibility between the graphite electrode and connecting nipple is important for satisfactory performance of the electrode joint.

The change in CTE with temperature is about the same for all graphite at high temperature. The mean linear CTE between room temperature and any final temperature can be obtained using the factors shown below.

Specific Resistance – A measurement of opposition to electric current flow. Low specific resistance of graphite electrodes allows maximum current carrying capability without overheating of the electrode column. The chart below shows the effect of temperature on the relative electrical resistivity of graphite electrodes.

relresist

Footnotes to Tables:

*Typical range property values not guaranteed.

*Electrodes and nipples are extruded products. Thus, these tables show only typical values which may vary from size to size, piece to piece or even within a piece.

UCAR® Graphite Electrodes and connecting nipples meet dimensional tolerances by IEC, JIS and NEMA as required by customers worldwide. Norms are available on request.

Ash Content: UCAR® Graphite Electrodes typically have less than 0.1% impurities and do not contain elements harmful to steelmaking.

AGX™ Grade Graphite Electrode Combinations

U.S. Standard Units

Electrode Diameter (Inches) IEC Designation Pin Dimensions (Inches) Threads per 25.4 mm
10 152T4N 6 x 7.5 4
10 155T3N 6.125 x 8.66 3
12 155T3N 6.125 x 8.66 3
12 177T3N 6.975 x 10.66 3
12 177T4N 7 x 8.5 4
14 177T3N 6.975 x 10.66 3
14 203T4N 8 x 10 4
14 203T4L 8 x 12 4
14 215T3N 8.5 x 12 3
16 215T3N 8.5 x 12 3
16 222T4N 8.75 x12 4
16 222T4L 8.75 x 14 4
16 241T3N 9.5 x 13.33 3
16 241T3L 9.5 x 14 3
18 241T3N 9.5 x 13.33 3
18 241T3L 9.5 x 14 3
18 241T4L 9.5 x 14 4
18 269T4L 10.625 x 18 4
18 273T3L 10.75 x 18 3
20 269T4L 10.625 x 18 4
20 269T4N 10.625 x 14 4
20 273T3N 10.75 x 14 3
20 273T3L 10.75 x 18 3
22 298T4N 11.75 x 14 4
22 298T3N 11.75 x 14.66 3
22 298T4L 11.75 x 18 4
24 317T4N 12.5 x 14 4
24 317T4L 12.5 x 18 4
26 374T4N 14.75 x 18 4
26 374T4L 14.75 x 22 4
28 374T4N 14.75 x 18 4
28 374T4L 14.75 x 22 4
30 406T 16 x 23 4

*Typical range, property values not guaranteed.

Metric Units

Electrode Diameter (mm) IEC Designation Pin Dimensions (mm) Threads per 25.4 mm
250 152T4N 152.40 x 190.50 4
250 155T3N 155.57 x 220.00 3
300 155T3N 155.57 x 220.00 3
300 177T3N 177.16 x 270.90 3
300 177T4N 177.80 x 215.90 4
350 177T3N 177.16 x 270.90 3
350 203T4N 203.20 x 254.00 4
350 203T4L 203.20 x 304.80 4
350 215T3N 215.90 x 304.80 3
400 215T3N 215.90 x 304.80 3
400 222T4N 222.25 x 304.80 4
400 222T4L 222.25 x 355.60 4
400 241T3N 241.30 x 338.70 3
400 241T3L 241.30 x 355.60 3
450 241T3N 241.30 x 338.70 3
450 241T3L 241.30 x 355.60 3
450 241T4L 241.30 x 355.60 4
450 269T4L 269.88 x 457.20 4
450 273T3L 273.05 x 457.20 3
500 269T4L 269.88 x 457.20 4
500 269T4N 269.88 x 355.60 4
500 273T3N 273.05 x 355.60 3
500 273T3L 273.05 x 457.20 3
550 298T4N 298.45 x 355.60 4
550 298T3N 298.45 x 372.50 3
550 298T4L 298.45 x 457.20 4
600 317T4N 317.50 x 355.60 4
600 317T4L 317.50 x 457.20 4
650 374T4N 374.65 x 457.20 4
650 374T4L 374.65 x 558.80 4
700 374T4N 374.65 x 457.20 4
700 374T4L 374.65 x 558.80 4
750 406T 406.4 x 584.2 4

*Typical range, property values not guaranteed.

Footnotes to Tables:

*Other pin sizes and may be available on a made-to-order basis.

Click here, for UCAR® Graphite Electrode Standard Lengths and Weights.

UCAR® Graphite Electrodes and connecting pins meet dimensional tolerances set forth by IEC, JIS, and NEMA as required by customers worldwide.

Your GrafTech representative is happy to discuss how each of the above combinations affect your electrode selection. Please choose the Sales Office nearest you.