What are the grades of silicon metal?

Silicon metal , also known as industrial silicon and crystalline silicon，it is a product made by smelting quartz and coke in an electric furnace，the content of the main component silicon element is around 98% (in recent years, 99.99% Si content is also included), the remaining impurities are iron, aluminum, calcium, etc. Its main use is as an additive for non-iron-based alloys and as a starting material for the production of semiconductor silicon and organic silicon.

In China, silicon metal is usually classified according to the content of the three main impurities, namely iron, aluminum, and calcium. According to the percentage content of iron, aluminum, and calcium in silicon metal , it can be divided into different grades such as 553, 441, 411, 421, 3303, 3305, 2202, 2502, 1101, etc.

Regarding the source of metal silicon numbering: The first and second codes represent the percentage content of iron and aluminum, while the third and fourth digits represent the content of calcium. For example, 553 represents the content of iron, aluminum, and calcium, which is 5%, 5%, and 3%; 3303 represents the content of iron, aluminum, and calcium, which is 3%, 3%, and 0.3%. We can refer to this table to understand.

As a manufacturer, how to control the grade ?

It is closely related to the quality and proportion of raw materials, as well as the level of production technology. After each furnace is completed, it will self-test and then classify it as a grade according to this standard. The grade of silicon metal produced in the same batch may also vary in different furnaces.

There will be some exceptions :

EX1：Iron and aluminum are both below 0.2%, but calcium is 0.6%, so it can only be classified as 441 for sale, but its quality is much better than 441. Buyers who buy such products can be said to be particularly lucky.

EX2：553 is also divided into oxygen supply and non oxygen supply. Without oxygen supply, there are more impurities and poor performance, but the price will be relatively cheap. Some buyers who are not familiar with the market may be easily confused.

EX3: There are also some special indicators, such as 853 and 97. About 853 ,it require 553 and other products to be mixed and customized. Some Indian customers need it .

97 silicon metal is sometimes called off-grade silicon metal. In fact, it is a product in the production process of silicon metal, with a silicon content of 97%, which can be called high silicon ferro silicon.

Due to the different grades have different purposes, (details can be found in the following link)
https://hsferroalloy.com/what-are-the-main-differences-among-various-types-of-metal-silicon/

It's not that the most expensive and purest ones are the most suitable for oneself , so buyers need to know its ultimate purpose in order to effectively play its role.

Our company will definitely provide the best quality and most suitable products according to the customer's situation, If you want to learn about silicon metal or are interested in it, we are happy to answer your any questions.

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