The use of silicon manganese alloy 6014
2022-06-02
Silicon-manganese alloy is an alloy composed of manganese, silicon, iron and a small amount of carbon and other elements. It is a ferroalloy with a wide range of uses and a large output. The reducing agent for the production of metal manganese by ferrocarbon manganese and electrosilicon thermal method, silicon manganese alloy is the main alloying element used in carbon steel, silicon manganese alloy is one of the main deoxidizers in the steelmaking process, almost all steel grades are Manganese needs to be used for deoxidation, because the oxygen product generated when manganese is used for deoxidation has a low melting point and is easy to float. Manganese can also increase the deoxidation effect of strong deoxidizers such as silicon and aluminum.
Application of silicon manganese alloy 6014:
In the process of smelting low-silicon and low-carbon steel in a converter, the molten steel needs to be deoxidized and alloyed. Since the content of silicon in the steel is quite low, in the prior art, the deoxidized and alloyed alloys avoid the use of silicon-containing alloys. Before using silicon-manganese alloy 6014, aluminum-manganese-titanium, aluminum-manganese-calcium, aluminum wire and medium-carbon ferromanganese are usually used as deoxidation and alloying materials. Although the above types of materials have the properties of deoxidation and alloying, due to the high aluminum content of aluminum-manganese-titanium, aluminum-manganese-calcium and aluminum wire, no matter which deoxidized and alloyed material is added to the molten steel, the After the aluminum reacts with the oxygen in the molten steel, a large amount of aluminum oxide is generated, and the aluminum oxide has a large viscosity and is not easy to float from the molten steel into the steel slag. At the same time, it will also affect the smooth flow of molten steel during pouring; although the medium carbon ferromanganese does not contain a large amount of aluminum, the content of alloying elements in the steel can also be adjusted to reach the composition range of the specifications of the steel being made, but its cost is particularly high. smell, and then increase the cost of smelting steel. Silicon is the most basic deoxidizer in steel. When smelting ordinary steel, silicon is usually used as a deoxidizer. Deoxidizing and alloying molten steel with ferrosilicon reduces aluminum and nitrogen in steel. Since the content of silicon in ferrosilicon is quite high, although it can be used as an ideal deoxidizer compared to silicon-manganese alloy 6014, silicon can maintain a high content in steel, and high silicon content can reduce the plasticity and toughness of steel, so , this kind of deoxidizer is only suitable for smelting ordinary steel, not suitable for smelting low-silicon and low-carbon steel; in the use method of ferrosilicon proposed by this patent, the first addition of ferrosilicon is at the beginning of LF furnace refining 10-20 Measure the molten steel composition within minutes, and then add ferrosilicon in an amount 0.02-0.06% lower than the target value of the molten steel silicon content; the second addition of ferrosilicon is to measure the molten steel composition again 10-20 minutes before the end of the LF furnace refining , and add ferrosilicon again to make the silicon content of molten steel reach the target value of ±0.01%. From the smelting process of LF furnace, because LF furnace is a kind of ladle refining furnace, its main contribution is to use argon at the bottom of ladle to make molten steel obtain stirring function, which is only conducive to the floating of inclusions in molten steel and the dissolved oxygen in it. The content of ferrosilicon is relatively small. If too much ferrosilicon is added, the silicon content in the molten steel will increase. Compared with the silicon-manganese alloy 6014, only the method of using ferrosilicon is proposed to make the target value of the silicon content in the molten steel within ±0.01. %.
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