Ferro Silicon Magnesium Size 10-25mm

Ferro Silicon magnesium alloy is an alloy product containing multiple elements such as Si, Mg, and Fe. The size of 10-25mm indicates that the size range of the alloy granules is between 10 mm and 25 mm. The 10-25mm size is considered the optimal size for spheroidizing treatment using the flushing method. It offers a more stable reaction than smaller particles and a higher absorption rate than larger particles. Too fine a size (<5mm) results in an overly vigorous reaction, splashing, and significant magnesium loss; too coarse a size (>30mm) leads to incomplete reaction and waste due to sedimentation. Therefore, most foundries specify this size for flushing ladles of molten iron weighing less than 5 tons.

Elements such as silicon and magnesium in mgsife alloy have certain chemical activity. At high temperatures, Si and Mg can react quickly with oxygen and show good deoxidation ability. For example, in the steelmaking process, silicon and magnesium preferentially combine with oxygen in molten steel to generate corresponding oxides, thereby reducing the oxygen content in steel and improving the quality of steel.

Deoxidizer

It is one of the commonly used deoxidizers in the steelmaking process. Si and Mg have a strong affinity with oxygen and can quickly remove oxygen from molten steel. The generated oxides such as silicon dioxide and magnesium oxide enter the slag and are discharged. Through effective deoxidation, defects such as pores and looseness in steel can be reduced, the purity and quality of steel can be improved, and the steel can have better mechanical properties and processing properties.

Alloying agent

As an alloying agent, alloying elements such as Si and Mg are introduced into steel. Silicon can improve the strength, hardness and elastic limit of steel, enhance the oxidation resistance and heat resistance of steel; magnesium helps to improve the toughness and fatigue resistance of steel, and refine the grain structure of steel. When producing some special steels, such as heat-resistant steel and stainless steel, the alloying effect of rare earth fesimg alloy can make steel have specific properties to meet the needs of different industrial fields.

Spheroidizing agent and inoculant

In the casting industry, especially in the production of ductile iron, RE ferro silicon magnesium alloy is an indispensable spheroidizing agent and inoculant. Magnesium can spheroidize graphite in molten iron, change the shape of graphite from flake to spherical, and greatly improve the mechanical properties of cast iron, such as tensile strength and elongation. Silicon acts as an inoculant to promote graphitization, increase the number of graphite balls, refine grains, and improve the casting and processing properties of cast iron. Silicon ferro magnesium alloys can be used to produce high-quality ductile iron castings, which are widely used in automobiles, machinery manufacturing, pipe fittings and other fields.

Adjusting the composition of molten iron

During the casting process, ferro Magnesium Silicon alloys can also be used to adjust the composition of molten iron to ensure that the content of silicon, magnesium and other elements in the molten iron meets the quality requirements of castings. By accurately controlling the amount of alloy added, the quality of the casting can be stabilized, casting defects caused by composition fluctuations can be reduced, and the yield rate of castings can be improved.

1. Too fine (buying 5-15mm or finer):

Overly vigorous reaction: The spheroidizing agent boils violently upon contact with molten iron, producing a burst of magnesium, which may even escape outside the ladle – very dangerous.

High magnesium loss: The reaction is too fast; the magnesium is burned off before it can be spheroidized, resulting in low absorption and requiring more spheroidizing agent, increasing costs.

Rapid cooling of molten iron: The vigorous reaction removes a large amount of heat, affecting the casting temperature.

2. Too coarse (a large number of particles >25mm are mixed in):

Incomplete reaction: Large particles settle to the bottom, failing to dissolve, wasting the spheroidizing agent.

Spheroidization degradation: Effective magnesium release is slow, resulting in uneven spheroidization of the molten iron, making later castings prone to poor spheroidization.

Ladle bottom crust: Undissolved spheroidizing agent forms a hard crust at the bottom of the ladle, difficult to clean.

Q: I bought 10-25mm, but the bag contains a lot of fine powder (<5mm) and coarse lumps (>30mm). Is this normal?

A: No, it's not normal. 10-25mm means that over 90% of the particles should fall within this range. If there's too much fine powder and coarse lumps, it indicates poor sieving control. We sieve every batch before shipment, and the particle size distribution meets your requirements. A particle size test report is included with the shipment; you can also re-inspect it yourself.

Q: For the same flushing method, how much does 10-25mm and 15-30mm differ?

A: 15-30mm is slightly cheaper than 10-25mm (it skips a sieving step). For larger packages, 15-30mm is more cost-effective. For smaller packages, stick with 10-25mm; otherwise, the reaction will be incomplete, affecting the spheroidizing effect.

Q: What impact does uneven size have on the use of the spheroidizing agent?

A: It has a significant impact. The fine powder reacts quickly, producing a large magnesium sheen; the coarse particles may sink to the bottom and fail to dissolve, resulting in waste. Uneven powder weight distribution leads to fluctuations in the effective magnesium content of each batch of molten iron, resulting in unstable spheroidization rate. Therefore, we have always emphasized that "more than 90% should fall within the target range."

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