Vanadium oxide core-spun yarn for smelting vanadium microalloyed steel to increase vanadium content

Abstract

The invention relates to a vanadium oxide core-spun yarn for smelting vanadium microalloyed steel to increase the vanadium content, belongs to high-strength low-alloy steel, and particularly relates to a vanadium-content-increasing additive for external vanadium microalloyed steel refining. The vanadium oxide core-spun yarn comprises a yarn core and an outer cover, wherein the outer cover is tightly clad on the yarn core. The vanadium oxide core-spun yarn is characterized in that the yarn core is formed by fully mixing 60-75% of powdered vanadium oxide V2O5, 39-24% of a powdered reducing agent (aluminum powder), and the balance being impuritiesby weight percentage; the outer cover is a low-carbon steel strip, and the thickness is 0.32-0.45mm; the core-spun yarn is circular strip-shaped, and the diameter is phi 9-13mm; the weight ratio of the yarn core and the outer cover per meter is 1.16-1.22. The vanadium oxide core-spun yarn is prepared according to the steps of powder preparation, drying, batching, powder stirring, finished product packaging and checking. The vanadium oxide core-spun yarn has the advantages that the design is novel and the technical process of melting ferrovanadium is simplified; energy is saved, the consumption is reduced, and the production cost is reduced; the vanadium recovery rate is obviously improved, the defects of a large amount dust and the environmental pollution are further prevented, and the vanadium oxide core-spun yarn is beneficial to safe production.

Description

technical field [0001] The invention belongs to the field of low-alloy high-strength steel, and in particular relates to vanadium-increasing additives for refining vanadium microalloyed steel outside a furnace. Background technique [0002] Since the 1970s, the development of low-alloy high-strength steels in the world has entered a new period-new varieties of micro-alloyed steels have emerged. Compared with general low-alloy steel, micro-alloyed steel has significant economic advantages. It can save about 25% of steel and reduce the cost of about 10%. The mechanical properties and process performance of steel have been significantly improved to meet various special performance requirements. . [0003] Vanadium is an important alloying element and has obvious advantages in terms of metallurgical properties: the solubility of V (C, N) precipitates in austenite is higher than that of Nb, Ti alloying elements corresponding carbonitrides; V ( C, N) The precipitates can not onl...

AI Technical Summary

Problems solved by technology

Its disadvantages are: the vanadium-containing alloy is expensive, and the cost of steelmaking is too high

Its defect is: V 2 o 5 Low melting point (943K), high saturated vapor pressure

Its disadvantages are: in the process of putting into the ladle, it not only increases the labor intensity of the workers; and the dust is flying, which deteriorates the working environment; the melting performance is poor, and the powdery vanadium oxide or vanadium slag that is easy to float to the liquid surface and solidify cannot be reduced and alloyed. In addition dust caused by V 2 o 5 Loss, so the recovery rate of vanadium is very low, only 55%-75%

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