Ø Name: Graphite Electrodes
Ø Description: The electrodes carry the electricity that heats electric arc furnaces, the vast majority steel furnaces. They are made from petroleum coke after it is mixed with petroleum pitch, extruded and shaped, then baked to sinter it, and then graphitized by heating it above the temperature (3000 °C) that converts carbon to graphite. They can vary in size up to 11 ft. long and 30 in. in diameter.
Ø Usage: An increasing proportion of global steel is made using electric arc furnaces, and the electric arc furnace itself is getting more efficient and making more steel per tonne of electrode
Ø Style
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l RP (Regular Power Grade Graphite Electrodes
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ITEM
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UNIT
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(M M)NOMINAL DIAMETER
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|||||
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75-130
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150-230
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250-350
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400-500
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75-130
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BULK DENSITY
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ELECTRODE
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G/CM3
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≥1.58
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≥1.58
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≥1.58
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≥1.58
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≥1.58
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NIPPLE
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≥1.65
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≥1.65
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≥1.65
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≥1.65
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≥1.65
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||
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RESISTIVITY
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ELECTRODE
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μΩM
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≤ 8.5
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≤ 8.5
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≤ 8.5
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≤ 8.5
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≤ 8.5
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NIPPLE
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≤ 5.0
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≤ 5.0
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≤ 5.0
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≤ 5.0
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≤ 5.0
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||
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BENDING STRENGTH
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ELECTRODE
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MPA
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≥12.0
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≥12.0
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≥12.0
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≥12.0
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≥12.0
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NIPPLE
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≥16.0
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≥16.0
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≥16.0
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≥16.0
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≥16.0
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||
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ELASTIC MODULUS
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ELECTRODE
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GPA
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≤8.0
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≤8.0
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≤8.0
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≤8.0
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≤8.0
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NIPPLE
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≤12.0
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≤12.0
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≤12.0
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≤12.0
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≤12.0
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||
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C.T.E.
(100-600/℃)
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ELECTRODE
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10-6/℃
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≤ 2.9
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≤ 2.9
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≤ 2.9
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≤ 2.9
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≤ 2.9
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NIPPLE
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≤ 2.9
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≤ 2.9
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≤ 2.9
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≤ 2.9
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≤ 2.9
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||
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ASH
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|
%
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≤0.3
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≤0.3
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≤0.3
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≤0.3
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≤0.3
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l HP (High Power Grade Graphite Electrodes)
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||||||
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ITEM
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UNIT
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(M M)NOMINAL DIAMETER
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||||
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200-300
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350-400
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450-500
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550-600
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|||
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BULK DENSITY
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ELECTRODE
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G/CM3
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≥ 1.65
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≥ 1.65
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≥ 1.65
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≥ 1.65
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NIPPLE
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≥ 1.75
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≥ 1.75
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≥ 1.75
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≥ 1.75
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||
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RESISTIVITY
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ELECTRODE
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μΩM
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≤6.5
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≤6.5
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≤6.5
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≤6.5
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NIPPLE
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≤4.0
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≤4.0
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≤4.0
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≤4.0
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||
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BENDING STRENGTH
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ELECTRODE
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MPA
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≥12.0
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≥12.0
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≥12.0
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≥12.0
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|
NIPPLE
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≥16.0
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≥16.0
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≥16.0
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≥16.0
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||
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ELASTIC MODULUS
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ELECTRODE
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GPA
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≤10.0
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≤10.0
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≤10.0
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≤10.0
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NIPPLE
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≤14.0
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≤14.0
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≤14.0
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≤14.0
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||
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C.T.E.
(100-600/℃)
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ELECTRODE
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10-6/℃
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≤ 2.2
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≤ 2.2
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≤ 2.2
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≤ 2.2
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NIPPLE
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≤ 2.2
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≤ 2.2
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≤ 2.2
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≤ 2.2
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||
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ASH
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%
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≤0.3
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≤0.25
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≤0.25
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≤0.25
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l UHP (Ultra High Power Grade Graphite Electrodes)
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||||
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ITEM
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UNIT
|
(M M)NOMINAL DIAMETER
|
||
|
200-350
|
400-500
|
|||
|
BULK DENSITY
|
ELECTRODE
|
G/CM3
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≥ 1.65
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≥ 1.65
|
|
NIPPLE
|
≥ 1.78
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≥ 1.78
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||
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RESISTIVITY
|
ELECTRODE
|
μΩM
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≤6.0
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≤6.0
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|
NIPPLE
|
≤4.0
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≤4.0
|
||
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BENDING STRENGTH
|
ELECTRODE
|
MPA
|
≥14.0
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≥14.0
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|
NIPPLE
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≥18.0
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≥20.0
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||
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ELASTIC MODULUS
|
ELECTRODE
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GPA
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≤12.0
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≤12.0
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|
NIPPLE
|
≤14.0
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≤18.0
|
||
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C.T.E.
(100-600/℃)
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ELECTRODE
|
10-6/℃
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≤ 1.4
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≤ 1.4
|
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NIPPLE
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≤ 1.2
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≤ 1.0
|
||
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ASH
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|
%
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≤0.2
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≤0.2
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