Classification of Graphite Electrodes and Precautions for Using It

Ⅰ. Classification of graphite electrodes

Graphite electrodes are mainly divided into ordinary power graphite electrodes, high-power graphite electrodes, and ultra-high power graphite electrodes.

1. Graphite electrodes of ordinary power

The current density of the graphite electrode allowed to be used is lower than 17A/cm 2.

2. High-power graphite electrode

The allowable graphite electrode current density is 18-25A/square centimeter, which is mainly used in high-power electric arc furnaces for steelmaking.

3. Ultra-high power graphite electrode

The allowable graphite electrode current density is greater than 25A/cm2. Mainly used in electric arc furnaces for ultra-high power steelmaking.

Ⅱ. Notes on graphite electrodes

1. Wet graphite electrodes should be dried before use.

2. Remove the foam plastic protective cap on the spare graphite electrode hole, and check whether the inner thread of the electrode hole is complete.

3. Clean the surface of the spare graphite electrode and the inner thread of the hole with compressed air free of oil and water; avoid cleaning with steel wire balls or metal emery cloth.

4. Carefully screw the connector into the electrode hole at one end of the spare graphite electrode (it is not recommended to directly install the connector into the electrode removed from the furnace), and do not collide with the thread.

5. Screw the electrode spreader (graphite material is recommended) into the electrode hole at the other end of the spare electrode.

6. When lifting the electrode, place a soft object under one end of the spare electrode mounting connector to prevent the ground from hitting the connector. Use the hook to extend into the hoisting ring of the sling and then hoist it up. The hoisting electrode should be stable to prevent the electrode from loosening from the B end or colliding with other fixing devices.

7. Lift the spare electrode above the electrode to be connected, align it with the electrode hole and drop it slowly; rotate the spare electrode to make the screw hook rotate and descend together with the electrode; when the distance between the end faces of the two electrodes is 10-20mm, use compressed air again Clean the two end faces of the electrode and the exposed parts of the connector; when the electrode is completely lowered at the end, do not be too violent, otherwise the electrode hole and the thread of the connector will be damaged due to violent collision.

8. Use a torque wrench to screw the spare electrode until the end faces of the two electrodes are in close contact (the correct connection gap between the electrode and the connector is less than 0.05mm).