Molten steel alloying cored wire and method

A cored wire and alloying technology is applied in the field of nitrogen alloying and vanadium in molten steel. Lower, less volatile effects

Active Publication Date: 2012-11-21
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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Effect test

Embodiment 1

[0036] The cored wire used for alloying of molten steel includes a core layer composed of a vanadium nitride alloy and a silicon-calcium alloy. The weight ratio of the vanadium nitride alloy to the silicon-calcium alloy is: vanadium nitride alloy: 90%, silicon-calcium alloy: 10%, both vanadium nitride alloy and silicon-calcium alloy are powders, with a particle size of 2mm or less, the core layer is wrapped with a skin made of cold rolled strip steel, and the outer diameter of the entire cored wire At 12mm, the vanadium recovery rate is 96%.

Embodiment 2

[0038] The cored wire used for alloying of molten steel includes a core layer composed of a vanadium nitride alloy and a silicon-calcium alloy. The weight ratio of the vanadium nitride alloy to the silicon-calcium alloy is: vanadium nitride alloy: 65%, silicon-calcium alloy: 35%, both vanadium nitride alloy and silicon-calcium alloy are powders, with a particle size of 3mm or less, the core layer is wrapped with a skin made of cold rolled strip steel, and the outer diameter of the entire cored wire At 12mm, the vanadium recovery rate is 97.8%.

Embodiment 3

[0040] The cored wire used for alloying of molten steel includes a core layer containing vanadium nitride alloy, silicon-calcium alloy and vanadium-iron alloy, and the weight ratio of the above-mentioned vanadium nitride alloy to silicon-calcium alloy and 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 all powder materials with a particle size of 3mm or less. The core layer is wrapped with a skin made of cold-rolled strip steel. The outer diameter of the entire cored wire is 13mm. The recovery rate of vanadium 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 for realizing the alloying of vanadium and nitrogen in molten steel and a method for realizing the alloying of vanadium and nitrogen in molten steel. Background technique [0002] Vanadium nitride alloy is a new type of alloy additive that can replace ferro-vanadium in 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 reached, adding vanadium nitride can save 30-40% of vanadium addition, thereby reducing cost. Vanadium nitride alloys can be used in structural steel, tool steel, pipe steel, rebar and cast iron. The application of vanadium nitride alloy in high-strength low-alloy steel can simultaneously carry out effective vanadium and nitrogen microalloying, promote the precipitation of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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