Ferrosilicon 74, the silicon content of ferrosilicon 74 is between 74% and 80%, and the rest is mainly iron. It also contains a small amount of impurity elements, such as aluminum, calcium, phosphorus, sulfur, etc. Generally, the aluminum content is required not to exceed a certain proportion, the phosphorus content is not more than 0.035%, and the sulfur content is not more than 0.02%, etc., to ensure the quality and performance of ferrosilicon. If the size is 10-50mm, the fluidity is good, the reaction speed is moderate, and it is easy to store and transport.

Ferro silicon 74 10-50mm

chemical composition

Grade	Chemical Composition(mass fraction)%
	Si	Al	Ca	Mn	Cr	P	S	C
	≥	≤
FeSi90Al1.5	87.0~95.0	1.5	1.5	0.4	0.2	0.04	0.02	0.2
FeSi9oAl3.0	87.0~95.0	3	1.5	0.4	0.2	0.04	0.02	0.2
FeSi75Al0.5-A	74.0~80.0	0.5	1	0.4	I0.3	0.035	0.02	0.1
FeSi75Al0.5-B	72.0~80.0	0.5	1	0.5	0.5	0.04	0.02	0.2
FeSi75Al1.0-A	74.0~80.0	1	1	0.4	0.3	0.035	0.02	0.1
FeSi75Al1.0-B	72.0~80.0	1	1	0.5	0.5	0.04	0.02	0.2
FeSi75Al1.5-A	74.0-80.0	1.5	1	0.4	0.3	0.035	0.02	0.1
FeSi75Al1.5-B	72.0~80.0	1.5	1	0.5	0.5	0.04	0.02	0.2
FeSi75Al2.0-A	74.0~80.0	2	1	0.4	0.3	0.035	0.02	0.1
FeSi75Al2.0-B	72.0~80.0	2		0.5	0.5	0.04	0.02	0.2
FeSi75-A	74.0~80.0			0.4	0.3	0.035	0.02	0.1
FeSi75-B	72.0~80.0			0.5	0.5	0.04	0.02	0.2
FeSi65	65.0~72.0			0.6	0.5	0.04	0.02

Specific use of ferrosilicon 74 size 10-50mm in steelmaking

Preparation before adding

Quality inspection: Before use, ferrosilicon 74 should be strictly inspected to check whether its silicon content is within the standard range, and at the same time check whether the content of impurities (such as aluminum, calcium, phosphorus, sulfur, etc.) meets the corresponding requirements to ensure its quality, so as not to affect the steelmaking effect.

Storage and transportation: Ferrosilicon 74 size 10-50mm should be properly stored in a dry and well-ventilated place to prevent moisture and rust. When transporting to the steelmaking workshop, use appropriate handling equipment, such as forklifts or cranes, to avoid particle damage and impurities.

ferro silicon 74 10-50mm

Adding time and method

Deoxidation stage:

Preliminary deoxidation: In the early stage of converter or electric furnace steelmaking, when the charge begins to melt, ferrosilicon 74 can be added in time for preliminary deoxidation. Generally, it can be added slowly and evenly to the surface of the molten steel through equipment such as silos and charging chutes. The amount added should be reasonably determined based on factors such as the initial oxygen content of the molten steel in the furnace, the steel grade requirements, and the size of the furnace capacity, usually accounting for a certain proportion of the total weight of the molten steel (for example, for some common steel grades, it may be around 0.1%-0.3%, which requires precise calculation and practical exploration). Its function is to react quickly with the free oxygen in the molten steel to generate oxides such as silicon dioxide that enter the slag and reduce the dissolved oxygen in the molten steel.

Final deoxidation: When steelmaking is about to end and before steel is tapped, an appropriate amount of ferrosilicon 74 must be added again for final deoxidation. At this time, the ladle is often used to put the ferrosilicon 74 particles into the molten steel in the ladle through a special ladle feeding device. The amount added at this stage must also be strictly controlled according to the deoxidation requirements of the steel grade. The purpose is to further reduce the oxygen content of the molten steel, make the steel higher in quality, and reduce defects such as pores and inclusions in the finished steel.

Alloying stage:

When the deoxidation operation is basically completed and the molten steel composition is adjusted, if it is necessary to increase the silicon content in the steel to enhance the performance of the steel (such as strength, hardness, elasticity, etc.), ferrosilicon 74 will be added as an alloying agent. The addition time at this stage is generally also during the steel tapping process or in the ladle. With the help of ladle refining and other process links, according to the silicon content requirements of the target steel grade, the required amount of ferrosilicon 74 can be accurately calculated and added to make it evenly integrated into the molten steel to ensure that the molten steel composition meets the standard requirements.

ferro silicon 74 10-50mm

Operation and precautions after adding

Stirring and mixing

In order to allow the added ferrosilicon 74 to disperse and react quickly and fully in the molten steel, some stirring methods can be used, such as stirring by blowing argon in the ladle, using the bubbles formed by argon to drive the molten steel to flow, so that the ferrosilicon 74 particles and the molten steel can be fully contacted and mixed, so that the deoxidation and alloying reactions can be carried out more thoroughly.

Observation and testing

Within a period of time after adding ferrosilicon 74, the state of the molten steel should be closely observed, such as changes in color and fluidity. At the same time, the oxygen content, silicon content and other key indicators of the molten steel should be promptly tested by rapid testing equipment to determine whether the deoxidation and alloying have achieved the expected effect. If the indicators do not meet the requirements, remedial measures should be taken in time, such as adding an appropriate amount of ferrosilicon 74 or performing other composition adjustment operations.

Slag treatment

Since silicon dioxide and other substances will be generated after deoxidation of ferrosilicon 74 and enter the slag, the slag must be properly treated in the subsequent steelmaking process. For example, the slag containing more impurity oxides can be removed through slagging operations to prevent it from re-mixing into the molten steel and affecting the quality of the steel.

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