Ferromanganese alloys used in steelmaking
2022-10-24
Manganese is one of the important alloying elements in steel materials. Manganese can change various properties such as strength, hardness, toughness, wear resistance and heat resistance of steel materials.
Manganese in iron and steel materials is mainly obtained by adding ferromanganese alloys to its melt. Ferromanganese can be divided into high carbon, medium carbon and low carbon ferromanganese due to different carbon content. Generally, the manganese content of low-carbon ferromanganese is more than 80, the manganese content of medium-carbon ferromanganese is more than 75, and the manganese content of high-carbon ferromanganese is more than 65. This is the most common ferromanganese content of several elements. According to different carbon content, it is divided into: micro-carbon ferromanganese: carbon not more than 0.15%; low carbon ferromanganese: carbon more than 0.15% to 0.7%; medium carbon ferromanganese: carbon more than 0.7% to 2.0%; high carbon ferromanganese : Carbon is more than 2.0% to 8.0%. Among them, high carbon ferromanganese is strictly limited due to its high carbon content, which will significantly increase the carbon content of steel when added to steel materials. Low carbon ferromanganese does not have the same problems as high carbon ferromanganese due to its low carbon content. Therefore, low carbon ferromanganese has a larger dosage and wider use than high carbon ferromanganese. , an important raw material for wear-resistant steel and structural steel. In the past, the production of low-carbon ferromanganese was mainly by blowing oxygen and decarburization into the liquid high-carbon ferromanganese melt to convert high-carbon ferromanganese into low-carbon ferromanganese. Improve manganese yield. The high-carbon ferromanganese liquid oxidative decarburization method has complex production process, high cost and serious environmental pollution.
According to the actual situation, use high carbon ferromanganese + medium carbon ferromanganese or high carbon ferromanganese + carbon wire (or carbon particles). Medium carbon ferromanganese has very little carbon increase, so except for steel with very low carbon control, the carbon increase problem is basically not considered. In some special steels, steels with very low carbon requirements, such as some silicon steels (very low carbon control) and ultra-low carbon steels, must consider all carbon-increasing factors. At this time, low carbon or even micro-carbon ferromanganese should be used to As far as possible, the molten steel does not increase carbon.
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