Ferro-silicon nitride alloy core-spun wire and production method thereof

Abstract

The invention discloses a ferro-silicon nitride alloy core-spun wire and a production method thereof, belonging to the technical field of core-spun wires. The ferro-silicon nitride alloy core-spun wire is formed by coating core powder with a steel belt, wherein the core powder comprises the following components in parts by mass: 70-95 parts of ferro-silicon nitride alloy, 4.9-29.7 parts of nitrogen-fixation alloy element ferric alloy, and 0.1-0.3 part of silicon-based rare earth alloy powder. The production method of the ferro-silicon nitride alloy core-spun wire comprises the following steps: preparing the ferro-silicon nitride alloy; preparing nitrogen-fixation alloy element ferric alloy; preparing silicon-based rare earth alloy powder; preparing the core powder; coating the core powder with the steel belt, namely coating the core powder by adopting the steel belt with the thickness of 0.34-0.45mm to obtain the core-spun wire with the diameter of 9-13mm. According to the ferro-silicon nitride alloy core-spun wire and the production method thereof, the nitrogen fixation effect and action can be obviously improved, the yield of nitrogen element in molten steel can be greatly increased, and the deficiency existing when the core-spun wire made of nitrogen-containing materials in the prior art serves as a nitrogen enhancement fortifier during production of microalloy steel can be overcome.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, vanadium-containing micro-alloy steel steelmaking production process, and relates to a ferrosilicon nitride alloy cored wire and a manufacturing method thereof. It has a broad application prospect in the production field of vanadium-containing microalloy steel, RHB400 and high-strength screw steel above RHB400E, and silicon steel as a nitrogen-increasing strengthening agent. Background technique [0002] In the production process of microalloyed steel, trace elements such as V, Nb, Al, Ti, etc., which have a strong effect of grain refinement and precipitation, are usually added, so that the steel can obtain high strength, high weldability and good formability after hot rolling. The disadvantage is that the trace elements V, Nb, Al, and Ti added to the steel are expensive, making the production cost high. At the same time, because Al and Ti are active elements, they are easy to r...

AI Technical Summary

Problems solved by technology

The disadvantage is that the trace elements V, Nb, Al, and Ti added to the steel are expensive, making the production cost high. At the same time, because Al and Ti are active elements, they are easy to react with oxygen in the steel to form high melting point oxide inclusions. , it is difficult to remove, thus polluting the molten steel and affecting the normal production of continuous casting

However, due to the following disadvantages of chromium nitride, titanium nitride, aluminum nitride and other materials: 1) the price is high, generally above 15,000 yuan / t, resulting in high production costs of microalloy steel; 2) chromium in a single nitrogen-containing material Titanium, aluminum, and titanium are living wave metals, which are added in the form of alloys after the furnace. Due to their small bulk density, they float on the surface of molten steel, and nitrogen-fixing alloy elements are easily burned and lost by oxidation in molten steel. The nitrogen-fixing alloy elements are greatly lost, and N is volatilized. Large, the nitrogen fixation effect is not good, the amount of nitrogen added to molten steel is small, the nitrogen yield is unstable (generally 0-25%), and the strengthening effect of N is limited; 3) The higher content of titanium and aluminum in nitrogen-containing materials, and steel The oxide inclusions produced by the middle oxygen reaction have high melting point, high viscosity, difficult to float, serious pollution to the quality of molten steel, and affect the normal casting of continuous casting, which limits the practical application of these nitrogen-containing materials in the production of microalloy steel

However, the technical solutions disclosed in the above-mentioned patent documents still have some room for iron and steel enterprises to tap potential and reduce costs. The key technical problem is: the yield of nitrogen in molten steel is low, resulting in nitrogen-containing materials being made into alloys and cored wires. Insufficient use of nitrogen-increasing strengthening agent in the production of micro-alloyed steel