Method for manufacturing low-carbon TWIP steel through AOD (argon oxygen decarburization) furnace

Abstract

The invention belongs to the field of metal smelting, and mainly relates to smelting manufacturing technology of low-carbon TWIP steel through an AOD (argon oxygen decarburization) furnace. The smelted TWIP steel comprises the following components in percentage by weight: 0%-0.06% of C, 20%-30% of Mn, 2.0%-3.0% of Si, 2.5%-3.5% of Al, and the balance of Fe. The particular technology procedures comprises the following steps: 1), the AOD furnace is adopted for oxygen decarburization process, once the carbon in the liquid steel is lower than 0.03%, the liquid steel is subject to alloying; 2), after the TWIP steel is subject to manganese alloying, ferrosilicon or / and metal aluminium is adopted to perform reduction reaction on manganese oxide, so that the yield of metal manganese is increased; the oxidation heat of silicon or / and aluminium is adopted to regulate the temperature of the liquid steel and compensate temperature drop of the liquid steel generated by the manganese alloying of the TWIP steel. The method is high in manufacturing efficiency, low in cost, stable in operation and easily-mastered in technology; the main raw material is easily accessible, and no specific requirement is needed; the realization of large-scaled industrialized production is facilitated.

Description

Technical field: [0001] The invention belongs to the field of metal smelting, and mainly relates to low-carbon TWIP steel argon oxygen furnace (AOD) smelting production technology. Background technique: [0002] In 1997, Grassel et al. found in experiments on Fe-Mn-Si-Al TRIP steels that when the manganese content reaches 25wt%, the aluminum content exceeds 3wt%, the silicon content is between 2 and 3wt%, and the carbon content is low, It has medium tensile strength (about 600Mpa) and extremely high elongation (80%). The product of tensile strength and elongation is more than 50000MPa%, which is twice that of high-strength and toughness TRIP steel. Because the high strength and toughness of this type of alloy comes from the formation of deformation twins during the deformation process, it is named twin induced plasticity steel, namely TWIP steel (Twinning Induced Plasticity). Due to the many excellent properties of TWIP steel, it has shown broad application potential in the fiel...

AI Technical Summary

Problems solved by technology

Induction furnaces and vacuum induction furnaces generally have small capacity, long production time, high energy consumption and low production efficiency

So far, there are still many problems in low-carbon TWIP high-efficiency and low-cost large-scale smelting production

[0005] One of the problems is that the carbon content of low-carbon TWIP steel is low, and the carbon content of the product is less than or equal to 0.06%, while the content of Mn, Si and Al is relatively high. Considering the problems of adding Mn, Si and other alloys to increase carbon and refractory materials in the later stage of smelting, etc. , it is necessary to reduce the carbon in the steel to less than 0.03% before alloying; the second problem is that the TWIP steel has a high alloy content, and a large amount of Mn, Si, Al and other alloys need to be added in the later stage of smelting, and the temperature drop is serious. During the smelting process, only The oxidation energy of carbon is insufficient; the third problem is that the TWIP steel alloy content is relatively high, especially the metal aluminum content is relatively high, and it is easy to cause silicon increase in molten steel when the molten steel is aluminum-alloyed, and the composition control is more difficult