400 UHP graphite electrode

Short Description:

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

Product Detail

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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

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Comparison Technical Specification for UHP Graphite Electrode 16"  
Item Unit Supplier Spec
Typical Characteristics of Pole
Nominal Diameter mm 400
Max Diameter mm 409
Min Diameter mm 403
Nominal Length mm 1600/1800
Max Length mm 1700/1900
Min Length mm 1500/1700
Bulk Density g/cm3 1.68-1.73
transverse strength MPa ≥12.0
Young' Modulus GPa ≤13.0
Specific Resistance µΩm 4.8-5.8
Maximum current density KA/cm2 16-24
Current Carrying Capacity A 25000-40000
(C.T.E) 10-6℃ ≤1.2 
ash content % ≤0.2
Typical Characteristics of Nipple (4TPI) 
Bulk Density g/cm3 1.78-1.84
transverse strength MPa ≥22.0
Young' Modulus GPa ≤18.0 
Specific Resistance µΩm 3.4~4.0
(C.T.E) 10-6℃ ≤1.0
ash content % ≤0.2

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.

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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.
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