Ferrosilicon 70% Alloy

70 ferrosilicon, also known as FeSi65 or 70# ferrosilicon, differs from 75 ferrosilicon primarily in that it maintains basic metallurgical properties while allowing for a wider control over silicon content (from 65% to 72%). Simultaneously, the control over impurities such as aluminum, calcium, and carbon is also relatively more lenient.

The benefit of this is a substantial reduction in production costs. For example, ferrosilicon75 has strict requirements for aluminum content (some grades require ≤0.5%), necessitating specialized refining. In contrast, ferrosilicon70 can have an aluminum content below 2.0%, resulting in shorter smelting times and lower electricity consumption, ultimately leading to a more affordable price.

The trade-off is that it's unsuitable for producing high-end steels with stringent requirements for impurities (especially aluminum and carbon), such as automotive panels and pipeline steel. However, it's perfectly adequate for construction steel, general castings, and steel deoxidation, saving a considerable amount of money.

If you're unsure which grade to choose, consider this approach:

If you simply want deoxidation and have no special requirements: Look at the FeSi65 grade; it has a silicon content of 65%-72% and is the most affordable.

For castings requiring inoculation treatment: You can choose grade B products like FeSi75Al1.5-B or FeSi75Al2.0-B. A slightly higher aluminum content (1.5%-2.0%) is actually beneficial for inoculation and is cheaper than grade A.

If you're concerned about phosphorus and sulfur impurities: Pay attention to grades ending in -A in the table; they have stricter impurity control, but are also slightly more expensive.

Deoxidizer

It is a commonly used and important deoxidizer in the steelmaking process. Oxygen dissolved in molten steel can seriously affect the quality of the steel, leading to decreased toughness, the formation of pores and other defects. The silicon in 70% Ferrosilicon Alloy has a strong affinity with oxygen and can quickly combine to form silicon dioxide, reducing the oxygen content in the steel, increasing the purity of the steel, and improving the quality and performance of the steel.

Alloying agent

Silicon is an important alloying element in steel. Adding 70# ferrosilicon can improve the strength, hardness, elastic limit, wear resistance and heat resistance of steel. When producing various types of steel such as structural steel, spring steel, and heat-resistant steel, it is necessary to add an appropriate amount of ferro silicon 70 to adjust the steel composition to meet the performance requirements of different steel grades. For example, adding silicon to spring steel can significantly increase its elastic limit and fatigue strength.

Inoculant

During the casting process, It is used as an inoculant to promote graphitization and reduce the tendency of white cast iron. When the molten iron solidifies, it provides a large number of crystal nuclei for graphite crystallization, making the graphite grains refined and evenly distributed in the casting, thereby improving the mechanical properties of the casting, such as strength, toughness and ductility. Commonly used in the production of gray cast iron, ductile iron and other castings. For example, in the production of ductile iron, effective inoculation can increase the number of graphite nodules, make them uniform in size, and improve the overall performance of the casting.

Auxiliary agent of spheroidizer

In the production of ductile iron, it is sometimes used as an auxiliary additive of spheroidizer. When used in combination with a spheroidizing agent, it helps stabilize the spheroidizing effect, improve the morphology and distribution of graphite nodules, and further improve the quality of ductile iron.

Q: What's the difference between 70 ferrosilicon and 75 ferrosilicon?

A: The most obvious differences are in deoxidation efficiency and price. 75 ferrosilicon has a higher silicon content, slightly stronger deoxidation ability, and a more stable yield. However, 70 ferrosilicon is cheaper, with a price difference typically several hundred yuan per ton. If your product doesn't have particularly high requirements (such as ordinary rebar or general castings), using 70 ferrosilicon is perfectly fine, and the money saved is more practical.

Q: My factory has always used 75 ferrosilicon, and now we want to switch to 70 ferrosilicon. What should we pay attention to?

A: It's best to test a small batch first. We suggest adjusting the dosage. For example, if you were using 1.5 kg of 75 ferrosilicon, you can slightly increase it to 1.6-1.7 kg when switching to 70 ferrosilicon. Then test the silicon content of the finished product to see if it meets the requirements. Also, 70 ferrosilicon may have a higher aluminum content, so if you have requirements for the purity of the molten steel, you need to be careful.

Q: Is the quality of your 70 ferrosilicon consistent between batches?

A: Rest assured, although 70% ferrosilicon is an economical product, we still prioritize stability. Before each batch leaves the factory, we use a spectrometer to analyze its composition, ensuring that key indicators such as silicon and aluminum content fluctuate within your required range. A material certificate will be provided with the shipment, and you can also conduct random checks yourself; any products that fail to meet the standards will be returned.

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