High-nitrogen low-oxygen silicon nitride vanadium iron alloy and preparation method thereof

Abstract

The invention discloses a high-nitrogen low-oxygen silicon nitride vanadium iron alloy and a preparation method thereof, and belong to the technical field of iron alloys. The high-nitrogen low-oxygensilicon nitride vanadium iron alloy is prepared from the compositions in percentage by weight: 30%-34% of vanadium, 10%-15% of silicon, 14%-16% of nitrogen, less than or equal to 0.8% of oxygen, lessthan or equal to 0.3% of C, less than or equal to 0.03% of sulfur, less than or equal to 0.05% of phosphorus and the balance of Fe. According to the preparation method of the high-nitrogen low-oxygensilicon nitride vanadium iron alloy, production is carried out at a micro-positive pressure of 0.18-0.2MPa, vanadium and silicon are separately nitrided at different temperatures in two steps, the nitriding effect of vanadium and silicon is fully guaranteed, and the nitrogen content in the alloy is improved; meanwhile, a raw material of the preparation method is purchased Ferrosilicon vanadium, the cost is low, the content of each component in a raw material product can be controlled, and the process route is simple; and meanwhile, a high vacuum sintering furnace is used for nitriding reaction, mass production can be carried out, and the preparation method can be applied on a large scale in the industry.

Description

technical field [0001] The invention relates to the technical field of ferroalloys, in particular to a high-nitrogen and low-oxygen silicon-vanadium ferro-nitride alloy and a preparation method thereof. Background technique [0002] In recent years, the most important technical progress of steel bars and rebars for construction is the use of microalloying technology to produce high-strength steel during the smelting process. The commonly used microalloying elements are niobium, vanadium and so on. They are usually added in the form of vanadium-iron alloy or niobium-iron alloy, and also in the form of vanadium-nitrogen alloy. However, the price of ferroniobium is expensive and the cost of microalloying is high. The microalloying effect of vanadium-iron alloy is not as good as that of vanadium-nitrogen alloy. When using vanadium-nitrogen alloy microalloying, the recovery rate of vanadium is low because part of the vanadium exists in the form of vanadium oxide and enters the s...

AI Technical Summary

Problems solved by technology

The calcination reaction of vanadium oxide and ferrosilicon is carried out in the solid state, and there are problems such as incomplete reaction, insufficient nitrogen enrichment, high residual oxygen content, low apparent density, and many types of raw materials for production; However, due to the use of ferrovanadium as raw material, the product quality may be slightly better than the former, but its production cost is higher

[0007] Chinese invention patent CN103526098A discloses a silicon nitride ferro-vanadium alloy and its production method; it is produced by the self-propagating method of igniting silicon-vanadium-ferro alloy under normal temperature and high pressure conditions, and the nitrogen content is unstable and uneven. The recovery rate of the alloy is low, the melting speed of the alloy is slow, and the output is low. It is only used for scientific research and cannot be produced on a large scale, and the equipment belongs to an ultra-high pressure reactor, which has safety risks.