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The order of adding various ferroalloys during steelmaking—once you see it, you’ll be amazed! (I)

The order of adding various ferroalloys during steelmaking—once you see it, you’ll be amazed! (I)

The sequence for adding ferroalloys is as follows: first, add those with weak deoxidizing power, then proceed to those with stronger deoxidizing power. Typically, alloy additions are initiated after slag removal has been completed and the carbon‑boosting operation has been finished, once a portion of the slag has been added to form a reducing slag. The specific requirements for adding different alloys are as follows:

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The order of adding various ferroalloys during steelmaking—once you see it, you’ll be amazed! (II)

The order of adding various ferroalloys during steelmaking—once you see it, you’ll be amazed! (II)

Vanadium‑iron should be added during the reduction phase. Due to vanadium’s strong affinity for oxygen, it readily oxidizes; therefore, it cannot be introduced during the oxidation phase and must be added only after the slag and molten steel have been effectively deoxidized in the reduction stage. Moreover, the addition of vanadium‑iron makes the molten steel highly susceptible to absorbing atmospheric nitrogen, which can degrade steel quality; hence, it should not be added prematurely but rather just before tapping. However, since vanadium‑iron requires a certain amount of time to melt, it should be charged 10–35 minutes prior to tapping. When the charge is small, the timing should be set toward the lower end of this range; for larger charges, the upper-middle range is appropriate. The recovery rate of vanadium‑iron is comparable to that of ferrosilicon.

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