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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.

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.)
1060; 72310; 350300
1272510450
1472690600
1672; 84; 96900; 1010; 1220800
1872; 84; 961130; 1360; 15501000
2072; 84; 961410; 1600; 19201300
2284; 96; 1102010; 2310; 26101800
2484; 96; 1102370; 2750; 31002500
2611036303300
2811042704400
3011045505900

*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)
2501500; 1800140; 160390
3001800230590
3501800310830
4001800; 2100; 2400410; 460; 5501075
4501800; 2100; 2400510; 620; 7001375
5001800; 2100; 2400640; 730; 8701770
5502100; 2400; 2700910; 1050; 11802460
6002100; 2400; 27001080; 1250; 14103440
650270016504520
700270019406000
750270022008000

*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

PropertyUnitsDiameterDiameterDiameterConnecting Nipples

250 – 400 mm,

10″ – 16″

450 – 600 mm,

18″ – 24″

650 – 750 mm

26″ – 30″

Bulk Densityg/cm3

1.65 – 1.75

1.65 – 1.74

1.67 – 1.75

1.73 – 1.86

Specific ResistanceµΩm

4.5 – 6.0

4.1 – 5.5

4.0 – 4.9

3.4 – 4.5

Flexural StrengthTensile 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 ExpansionX10-6/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 CelciusAdded factor
1000
2002.0 x 10-7
3004.0
4006.0
5007.7
6009.2
70010.4
80011.4
90012.3
100013.2
150017.2
200021.2
250025.2

*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 DesignationPin Dimensions (Inches)Threads per 25.4 mm
10152T4N6 x 7.54
10155T3N6.125 x 8.663
12155T3N6.125 x 8.663
12177T3N6.975 x 10.663
12177T4N7 x 8.54
14177T3N6.975 x 10.663
14203T4N8 x 104
14203T4L8 x 124
14215T3N8.5 x 123
16215T3N8.5 x 123
16222T4N8.75 x124
16222T4L8.75 x 144
16241T3N9.5 x 13.333
16241T3L9.5 x 143
18241T3N9.5 x 13.333
18241T3L9.5 x 143
18241T4L9.5 x 144
18269T4L10.625 x 184
18273T3L10.75 x 183
20269T4L10.625 x 184
20269T4N10.625 x 144
20273T3N10.75 x 143
20273T3L10.75 x 183
22298T4N11.75 x 144
22298T3N11.75 x 14.663
22298T4L11.75 x 184
24317T4N12.5 x 144
24317T4L12.5 x 184
26374T4N14.75 x 184
26374T4L14.75 x 224
28374T4N14.75 x 184
28374T4L14.75 x 224
30406T16 x 234

*Typical range, property values not guaranteed.

Metric Units

Electrode Diameter (mm)IEC DesignationPin Dimensions (mm)Threads per 25.4 mm
250152T4N152.40 x 190.504
250155T3N155.57 x 220.003
300155T3N155.57 x 220.003
300177T3N177.16 x 270.903
300177T4N177.80 x 215.904
350177T3N177.16 x 270.903
350203T4N203.20 x 254.004
350203T4L203.20 x 304.804
350215T3N215.90 x 304.803
400215T3N215.90 x 304.803
400222T4N222.25 x 304.804
400222T4L222.25 x 355.604
400241T3N241.30 x 338.703
400241T3L241.30 x 355.603
450241T3N241.30 x 338.703
450241T3L241.30 x 355.603
450241T4L241.30 x 355.604
450269T4L269.88 x 457.204
450273T3L273.05 x 457.203
500269T4L269.88 x 457.204
500269T4N269.88 x 355.604
500273T3N273.05 x 355.603
500273T3L273.05 x 457.203
550298T4N298.45 x 355.604
550298T3N298.45 x 372.503
550298T4L298.45 x 457.204
600317T4N317.50 x 355.604
600317T4L317.50 x 457.204
650374T4N374.65 x 457.204
650374T4L374.65 x 558.804
700374T4N374.65 x 457.204
700374T4L374.65 x 558.804
750406T406.4 x 584.24

*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.