Graphite electrodes are mainly used in electric arc furnace. They are presently the only products available that have the high levels of electrical conductivity and the capability of sustaining the extremely high levels of heat generated in EAF. Graphite electrodes are also used to refine steel in ladle furnaces and in other smelting processes. Graphite electrodes are divided into 3 Types: UHP Graphite electrodes, HP Graphite electrodes, RP Graphite electrodes.

Low price graphite electrode for UHP HP RP electric arc furnace

Graphite electrodes production:

1. Raw materials: use of high quality calcined petroleum coke and needle coke

2. Calcination: the carbonaceous raw materials are heat-treated at 1250-1350°C to discharge the contained moisture and volatile matter, and the production of correspondingly improving the raw material properties.

3. Crushing, screening, batching: before batching, the large calcined petroleum coke and needle coke should be crushed, ground, and screened, and then aggregates and powders of various sizes should be processed according to the requirements of the formula. , Binders are calculated separately, weighed for ingredients.

4. Mixing and kneading: At a certain temperature, the quantitative carbonaceous particles and powders of various particle sizes and the quantitative coal pitch are stirred and mixed uniformly, and the process of synthesizing plastic paste is carried out.

5. Forming: The process of plastically deforming the mixed carbon paste under the external force of the molding equipment to form a green body with a certain shape, size, density and strength.

6. Baking: It is the process of carbonizing the coal pitch in the green body by performing high temperature heat treatment in a carefully designed heating furnace under the protection of the filler. The calcined carbon products have higher mechanical strength, refractive index resistivity, better thermal stability and chemical stability.

7. Impregnation : Inject carbon material into a pressure vessel, and inject liquid bituminous cement under certain temperature and pressure conditions to reduce the porosity of the product, increase the bulk density and mechanical strength of the product, and improve the electrical and thermal conductivity of the product.

8. Secondary baking: the production of electrodes with higher bulk density requirements (except RP) and joint blanks need to be second baked, and the joint blanks need to be subjected to three impregnation and four baking or two impregnation and three baking.

9. Graphitization: The purpose of graphitization is to improve the conductivity and torsion of the graphite electrodes, improve the impact resistance and chemical stability of the GE, make the GE have lubricity, abrasion resistance, remove impurities, and improve purity. Usually the RP graphite electrode graphitization temperature range: 2500-2600 degrees, resistance range 8-11; HP graphite electrode required graphitization temperature range: 2600-2800 degrees, resistance range 6-8; UHP graphite electrode required graphitization temperature range: 2800 degrees or more, The resistance range is below 6;

10. Machining: The purpose is to achieve the required size, shape, precision, etc., and meet the use requirements of the electrode body and nipples through cutting. Graphite electrode machining is divided into two independent processes, the electrode body and the nipples.

11. Finished product and package inspection: finished product inspection process includes appearance, weight, length, diameter, resistence, bulk density inspection, etc.; packaging inspection is inspected according to customers’requirements to check the label and mark whether is correct, and the packaging if strong, etc.

Graphite electrodes usage:

Graphite electrodes are used primarily in electric arc furnace steel manufacturing. Graphite electrodes can provide high levels of electrical conductivity and capability of sustaining the extremely high levels of generated heat. Graphite electrodes are also used in the refinement of steel and similar smelting processes.

Low price graphite electrode for UHP HP RP electric arc furnace

1. The electrode holder should be held in the place beyond the security line of the top electrode; otherwise the electrode would be easily broken. The contact surface between the holder and the electrode should be cleaned up regularly to maintain a good contacting. The cooling jacket of the holder shall be avoided from water leakage.
2. Identify the reasons if there is gap in the electrode junction, do not use the muntil the gap is eliminated.
3. If there is falling off of nipple bolt when connecting electrodes, it is necessary to complete the nipple bolt.
4. The application of electrode should avoid of tilting operation, particularly, the group of connected electrodes should not be put horizontally so as to prevent from breaking.
5. When charging materials to the furnace, the bulk materials should be charged to the place of the furnace bottom, so as to minimize the impact of the large furnace materials on the electrodes.
6. The large pieces of insulation materials should be avoided of stacking on the bottom of the electrodes when smelting, so as to prevent from affecting the electrode use, or even broken.
7. Avoid of collapsing the furnace lid when rising or dropping the electrodes, which may result in electrode damage.
8. It is necessary to prevent the steel slag from splashing to the threads of the electrodes or nipple stored in the smelting site, which my damage the precision of the threads.

Jerry Li

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