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Molten steel alloying cored wire and method

A technology of alloying and cored wire, which is applied in the field of nitrogen alloying and vanadium in molten steel, can solve the problems of large fluctuation range, low vanadium recovery rate, and affecting product quality stability, and achieve small fluctuation range and high recovery rate , the effect of reducing the free oxygen content

Active Publication Date: 2011-10-05
PANZHIHUA IRON AND STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this kind of method has the following disadvantages: the vanadium recovery rate is still low, and the fluctuation range of the vanadium recovery rate and the nitrogen recovery rate is relatively large, which affects the stability of product quality

Method used

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  • Molten steel alloying cored wire and method

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Embodiment 1

[0036]A cored wire for alloying molten steel, including a core layer, the core layer is composed of a vanadium nitride alloy and a silicon-calcium alloy, and the weight ratio of the above-mentioned vanadium nitride alloy and silicon-calcium alloy is: vanadium nitride alloy: 90%, silicon-calcium alloy: 10%, both vanadium nitride alloy and silicon-calcium alloy are powder materials, the particle size is less than 2mm, the core layer is wrapped with a sheath made of cold-rolled strip steel, and the outer diameter of the entire cored wire It is 12mm, and the recovery rate of vanadium is 96%.

Embodiment 2

[0038] A cored wire for alloying molten steel, including a core layer, the core layer is composed of a vanadium nitride alloy and a silicon-calcium alloy, and the weight ratio of the above-mentioned vanadium nitride alloy and silicon-calcium alloy is: vanadium nitride alloy: 65%, silicon-calcium alloy: 35%, both vanadium nitride alloy and silicon-calcium alloy are powder materials, the particle size is less than 3mm, the core layer is wrapped with a sheath made of cold-rolled strip steel, and the outer diameter of the entire cored wire It is 12mm, and the recovery rate of vanadium is 97.8%.

Embodiment 3

[0040] A cored wire for alloying molten steel, including a core layer, the core layer contains a vanadium nitride alloy, a silicon-calcium alloy and a vanadium-iron alloy, and the weight ratio of the vanadium nitride alloy to the silicon-calcium alloy and the vanadium-iron alloy is: Vanadium nitride alloy: 80%, silicon-calcium alloy: 10%, vanadium-iron alloy: 10%. Vanadium nitride alloy, silicon-calcium alloy and vanadium-iron alloy are powder materials with a particle size of less than 3mm. The core layer is wrapped with a sheath made of cold-rolled strip steel. The outer diameter of the entire cored wire is 13mm. The vanadium recovery rate is 96.5%.

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Abstract

The invention discloses a molten steel alloying cored wire and a molten steel alloying method, which can improve the recovery rate of vanadium, prevent wire lockage and breakage, and facilitates feeding the cored wire. The cored wire comprises a core layer and a skin, wherein the core layer contains a vanadium nitride alloy and an aluminum metal. The method mainly comprises the following steps of: adding a calcium-silicon alloy into the core layer of the cored wire; and feeding the cored wire into the molten steel. By adding the calcium-silicon alloy into the core layer, the free oxygen content in the molten steel can be reduced, and the possibility of combining vanadium and oxygen is reduced, so that more vanadium participates in alloying to improve the recovery rate of the vanadium.

Description

technical field [0001] The invention relates to a cored wire used for alloying liquid steel vanadium and nitrogen and a method for realizing alloying liquid steel vanadium and nitrogen. Background technique [0002] Vanadium nitride alloy is a new alloy additive that can replace ferrovanadium for the production of microalloyed steel. The addition of vanadium nitride alloy to steel can improve the comprehensive mechanical properties of steel such as strength, toughness, ductility and thermal fatigue resistance, and make the steel have good weldability. When the same strength is achieved, the addition of vanadium nitride saves 30-40% of the added vanadium, thereby reducing the cost. Vanadium nitride alloys can be used in structural steel, tool steel, pipe steel, steel bars and cast iron. The application of vanadium nitride alloy in high-strength low-alloy steel can effectively micro-alloy vanadium and nitrogen at the same time, promote the precipitation of carbon, vanadium a...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21C7/00
Inventor 刘明吴仕富杨杰张国才邓通武柏万春罗开金刘昌恒
Owner PANZHIHUA IRON AND STEEL
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