A silicon titanium aluminum nitride material, its preparation method and application

Abstract

The invention discloses a silicon-titanium-aluminum nitration material, and a preparation method and application thereof. The silicon-titanium-aluminum nitration material comprises the following chemical components in percentage by mass: 10-35% of nitrogen, 0.1-20% of manganese, 20-50% of silicon, 0.5-15% of aluminum, 1-30% of titanium, 5-35% of iron, 0.2-12% of vanadium, no more than 0.15% of sulfur and no more than 0.15% of phosphorus. According to the invention, the melting point of the silicon-titanium-aluminum nitration material is low (1450-1500 DEG C), the density is 3.3-6.3 t / m<3>, the absorptivity of nitrogen in steel is more than 75%, the controlled hit rate of nitrogen in steel can reach 100%, and the steel production cost is saved by 10-90 Yuan / ton; and the preparation method is simple, can be widely used for nitrogen-containing steel smelting in the field of steel metallurgy, and has wide application prospects.

Description

technical field [0001] The invention relates to a silicon-titanium-aluminum nitride material, a preparation method and application thereof, in particular to a production method of a nitrogen-containing alloy that provides high-efficiency micro-nitrogen alloying treatment for steel production. Background technique [0002] At present, there are many kinds of nitrides, such as silicon nitride, aluminum nitride, boron nitride, titanium nitride, zirconium nitride, manganese nitride, ferrosilicon nitride, ferrosilicon manganese nitride, ferrochromium nitride, nitrogen Ferrovanadium, etc. [0003] Among them, silicon nitride, aluminum nitride, boron nitride, titanium nitride, and zirconium nitride are mainly used for refractory materials, wear-resistant pigments, wear-resistant machinery or wear-resistant parts due to their high melting point, hardness and good wear resistance. And other fields, its synthesis process mainly includes high-pressure sintering and atmospheric pressur...

AI Technical Summary

Problems solved by technology

This type of nitride has the following disadvantages: ① high synthesis temperature, high energy consumption, especially high power consumption; ② high quality requirements for raw materials, not only high purity of raw materials, but also appropriate particle size distribution of raw materials; ③ long production cycle , single furnace output is low, unit cost is high; ④ This type of nitride has a high melting point, good high temperature stability, it is difficult to melt quickly at the temperature of molten steel and is absorbed by molten steel, and is not suitable as a nitrided alloy for nitrogen alloying treatment of molten steel

Although these nitrogen-containing alloys can be used as nitrogen-containing alloys for nitrogen alloying treatment of molten steel, they also have the following obvious deficiencies: ① Although ferrosilicon nitride and ferrosilicon manganese nitride have high nitrogen content, these nitrided alloys have high melting points , the dissolution rate is slow at a temperature of 1500-1700 ° C, and the temperature of molten steel needs to be raised to 1800 ° C or even higher to ensure that nitrogen dissolves into the steel, which will increase energy consumption and increase the consumption of refractory materials per ton of steel , it is difficult to control the cleanliness of steel; on the other hand, it also leads to complex production process, increased control difficulty, low production efficiency, and increased manufacturing cost per ton of steel; at the same time, it causes unstable nitrogen content in steel, resulting in a decrease in the hit rate of nitrogen content in steel, Became a waste product because the nitrogen did not meet the standard

It has the following disadvantages: although its melting point is lower than that of ferrosilicon nitride and ferrosilicon manganese nitride, it is also above 1600°C; in addition, the nitrogen content of this type of nitride generally does not exceed 10%, and the nitrogen content is low. For nitrogen-containing steel, the addition of this type of alloy is large, and the cost of the alloy increases; the high chromium content of chromium nitride limits its use in low-chromium steel

[0006] There are Mn-N and Fe-N bonds in alloys such as ferrosilicon nitride, ferrosilicon manganese nitride and ferromanganese nitride. When they are added to steel with high manganese content, they are extremely stable during solidification, heating, deformation and cooling. Easy to form brutenite phase (Mn 4 N and Fe 4 N), the brutenite phase is an aging brittle phase, and its aging incubation period is uncertain. Therefore, there is an uncertain aging and brittle fracture risk in the production of steel using these three conventional nitrided alloys

[0007] The melting point of vanadium nitrogen alloy is not high, and it is easy to completely dissolve with the iron matrix at the temperature of molten steel, and it is easy to precipitate vanadium carbonitride or solid solution in steel during solidification, heating and rolling of molten steel, which plays an important role in strengthening steel , has become an important alloy raw material for vanadium and nitrogen microalloying, but the alloy metal is precious metal and strategic resource, which is expensive and resource is tight