1.What are the measures to reduce electrode oxidation consumption in EAF steelmaking?

Reduction measures mainly include:

(1) Reduce the oxidation consumption around the electrode, strengthen the sealing of the furnace and reduce air intrusion into the furnace; Minimize the exposure time of red hot electrode outside the furnace and standardize oxygen blowing operation.

(2) For the smelting furnace, if conditions permit, the electrode adopts spray cooling technology, which can effectively reduce the oxidation consumption on the side of the electrode.

(3)The anti-oxidation performance of the electrode body can be improved by spraying anti-oxidation substances on the electrode surface in the steel factory or by the electrode manufacturer using anti-oxidation impregnation technology before the electrode leaves the factory.

2.What is the effect of electrode phase sequence on the use of electrode?

When making steel in electric arc furnace, the positive and negative electrode phase sequence has a significant impact on the tripping and breaking of the electrode during use. If the electrode phase sequence is clockwise, the electrode will loosen after being energized for a period of time, which is easy to cause electrode loosening or joint breaking. The correct electrode phase sequence should be counterclockwise, so that the electrode will be more and more closely connected in use.

3. Why is the phase electrode required to be in parallel and aligned with the top hole of the furnace cover when making steel in the electric arc furnace?

The electrode column shall be aligned with the top hole of the furnace cover. The electrode column shall avoid friction with the furnace cover, otherwise the friction with the furnace cover during lifting and lowering will break the electrode of the furnace cover. For AC furnace, the three-phase electrode column shall be kept parallel as far as possible.

4. How to apply torque during electrode screwing?

The torque applied during electrode screwing shall be appropriate and the operation shall be inertial. Too small torque will cause thermal loosening of the joint, and too large torque will cause cracking of the electrode joint hole. Special electrode screwing tools shall be used during screwing, and do not screw too tight and loose. If there is a gap between the end faces after tightening, it must be removed and cleaned before screwing again.

5. Why is graphite sling better than metal sling?

Although the metal spreader is durable and not easy to be damaged, the thermal expansion of the metal spreader is easy to expand and crack the electrode hole after being heated during use. At the same time, it is easy to damage the thread in the electrode hole when receiving the metal spreader, resulting in large-area scraping off of the thread in the hole, making the electrode easy to trip. Because the graphite spreader has the same thermal expansion performance and hardness as the electrode, The above-mentioned bad use will not occur, but the graphite spreader has a short service life and is easy to be damaged. If serious damage is found, it shall be replaced in time.

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