Titanium silicon nitride core-spun yarn

Abstract

The invention discloses a titanium silicon nitride core-spun yarn which comprises a core layer and a steel sheet layer wrapped outside the core layer, wherein the core layer is a titanium silicon nitride alloy layer; a network support layer prepared from steel or iron is arranged between the core layer and steel sheet layer; and the titanium silicon nitride alloy layer is composed of titanium silicon nitride alloy particles with the particle size of less than 3mm. The Ti and the carbon or nitrogen in the steel form nano-size compounds which have favorable refinement effect on the structure, thereby enhancing the strength of the ferrous material, enhancing the TiN particle stability by nitridation and effectively preventing the austenite grains from growth. The titanium silicon nitride core-spun yarn sufficiently utilizes the cheap nitrogen element, and can save the titanium addition amount on the premise of ensuring certain strength level, thereby further lowering the cost of the non-quenched and tempered steel.

Description

technical field [0001] The invention relates to a cored wire, in particular to a titanium nitride silicon cored wire. Background technique [0002] Titanium nitride silicon cored wire is a new type of composite cored wire in steel production. Adding it in the late stage of refining can increase the yield of nitrogen and titanium in steel, reduce the amount of other ferroalloys, and have significant economic benefits. [0003] As a strong carbonitride forming element, titanium only needs to add a small amount (not more than 1 / 10,000) to the steel, which can significantly improve the performance of the steel, and its effect on improving the strength of the steel exceeds that of the rare and precious alloy vanadium-niobium alloy. However, the titanium element in ferrotitanium has a strong affinity with nitrogen, sulfur, carbon, and oxygen in the steel, which makes the recovery rate of titanium low and unstable during microalloying; when the dissolved oxygen in the steel is high...

AI Technical Summary

Problems solved by technology

However, the titanium element in ferrotitanium has a strong affinity with nitrogen, sulfur, carbon, and oxygen in the steel, which makes the recovery rate of titanium low and unstable during microalloying; when the dissolved oxygen in the steel is high, the titanium is severely Oxidation can cause nodules at the nozzle of the tundish, resulting in "dead flow" in continuous casting

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