400 UHP graphite electrode

Short Description:

Grade: Ultra High Power
Applicable furnace: EAF
Length: 1800mm/2100mm/2400mm
Nipple:3TPI/4TPI
Shipping Term: EXW/FOB/CIF


Product Detail

Product Tags

Graphite electrodes are mainly used in the steelmaking process. Iron scrap gets melted in an electric arc furnace and recycled. As a kind of conductor, they are an essential component in this kind of

UHP graphite electrode is mainly made up of high-quality needle coke,and widely used in ultra high power electric arc furnaces.It is capable of carrying the current density more than 25A/cm2

400 UHP graphite electrode01

Standard for ultra high power graphite electrodes and connectors

items

unit

nominal diameter(mm)

250~400

450~550

600~700

specific resistance

electrode nipple

μ Ω•m

4.8~5.8   3.4~4.0

4.5~5.6   3.4~3.8

4.5~5.4   3.0~3.6

  transverse strength

electrode nipple

MPa

≥12.0    ≥22.0

≥12.0    ≥22.0

≥10.0    ≥24.0

elastic modulus

electrode nipple

GPa

≤13.0  ≤18.0  

≤13.0  ≤18.0

≤13.0  ≤20.0

 ash content

electrode nipple

%

≤0.2

≤0.2

≤0.2

bulk density

electrode nipple

g/m³

1.68~1.73   1.78~1.84

1.68~1.72   1.78~1.84

1.68~1.72   1.80~1.86

C.T.E)

electrode nipple

10℃

≤1.2 ≤1.0

≤1.2 ≤1.0

≤1.2 ≤1.0

Manufacturing process
Graphite electrode is mainly made of petroleum coke and needle coke, mixed with coal pitch, getting through processes of calcinations, kneading, forming, baking, graphitizing and machining, finally to be products. Here are some explanations for some production process:

Kneading: Stirring and mixing a certain amount of carbon particles and powder with a certain amount of binder at a certain temperature, this process is called kneading.

400 UHP graphite electrode02

The function of kneading
①Mix all kinds of raw materials evenly, and at the same time make solid carbon materials of different particle sizes uniformly mix and fill, and improve the density of the mixture;
②After adding coal asphalt, get all material firmly together.
③Some coal pitches penetrate into the internal voids, which further improves the density and adhesion of the paste.

Forming: The kneaded carbon paste is extruded into a green body (or green product) with a certain shape, size, density and strength in a molding equipment. The paste has a plastic deformation under the external force.

Roasting also called baking, It is a high temperature treatment, making the coal pitch carbonized to  coke formed, which consolidate the carbonaceous aggregates and powder particles together with high mechanical strength, lower resistivity, better thermal stability and chemical stability.
Secondary roasting is to bake one more time, making the penetrating pitch carbonized . Electrodes (all types except RP) and nipples that require higher bulk density are required to be second-baked, and nipples three-dip four-bake or two-dip three-bake.
400 UHP graphite electrode04


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