Cored wire, its application, vanadium and nitrogen alloyed molten steel, preparation method of vanadium and nitrogen alloyed molten steel, and vanadium and nitrogen micro-alloyed steel

A vanadium-nitrogen alloy and cored wire technology is applied in the fields of cored wire and its application, vanadium-nitrogen alloyed molten steel and its preparation, and vanadium-nitrogen microalloyed steel, achieving high yield strength and tensile strength, high recovery rate, Recovery rate and stable effect

Inactive Publication Date: 2014-09-17
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has certain limitations in the application of some varieties with higher nitrogen content requirements, because the nitrogen content of this kind of vanadium nitride cored wire is subject to the ratio of nitrogen and vanadium

Method used

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  • Cored wire, its application, vanadium and nitrogen alloyed molten steel, preparation method of vanadium and nitrogen alloyed molten steel, and vanadium and nitrogen micro-alloyed steel
  • Cored wire, its application, vanadium and nitrogen alloyed molten steel, preparation method of vanadium and nitrogen alloyed molten steel, and vanadium and nitrogen micro-alloyed steel

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Example Embodiment

[0033] The present invention provides a method for preparing vanadium-nitrogen alloyed molten steel. The method includes: feeding the cored wire of the present invention into molten steel to be alloyed with vanadium-nitrogen for vanadium-nitrogen alloying.

[0034] According to the preparation method of vanadium-nitrogen alloyed molten steel of the present invention, in order to facilitate the rapid feeding of the cored wire into the molten steel, and at the same time to improve the yield strength and tensile strength of the vanadium-nitrogen microalloyed steel, it is preferable to perform the vanadium-nitrogen alloying process , Vanadium-nitrogen alloying is carried out under dynamic conditions. The dynamic conditions can be achieved by shaking or rotating the ladle. For example, the steel ladle can be shaken while the cored wire is fed into the molten steel in the ladle through the wire feeding device.

[0035] According to the method for preparing vanadium-nitrogen alloyed molten...

Example Embodiment

[0049] Example 1

[0050] A cored wire A1 (outer diameter of 13mm), including a core layer and an outer layer covering the core layer, the core layer is made of vanadium-nitrogen alloy, ferrosilicon nitride and iron alloy powder (particle size is less than 2mm) Composition, the outer layer is a skin made of cold-rolled strip steel (brand St12), in which the powder contains vanadium-nitrogen alloy (VN16, vanadium content 78% by weight, N content 16% by weight): 94% by weight, nitrided Ferrosilicon (36% by weight of N and 52% by weight of Si): 5% by weight, ferroalloy: 1% by weight, where the ferroalloy is a mixed alloy of ferro-niobium alloy and ferro-titanium alloy, and the weight of ferro-niobium alloy and ferro-titanium alloy The ratio is 1:1, the ferro-niobium alloy is FeNb60 (the content of Nb+Ta is 61% by weight, the content of Ta is 0.2% by weight, the rest is Fe and other unavoidable impurity elements), and the ferro-titanium alloy is FeTi40 (the content of Ti is 40% by we...

Example Embodiment

[0051] Example 2

[0052] A cored wire A2 (outer diameter of 12mm), including a core layer and an outer layer covering the core layer, the core layer is made of vanadium-nitrogen alloy, ferrosilicon nitride, and iron alloy powder (particle size below 3mm) Composition, the outer layer is a skin made of cold rolled strip steel (brand St12), where the powder contains vanadium-nitrogen alloy (VN16, vanadium content 78% by weight, N content 16% by weight): 51% by weight, nitrided Ferrosilicon (36% by weight of N and 52% by weight of Si): 24% by weight, ferroalloy: 25% by weight, wherein the ferroalloy is a mixed alloy of ferro-niobium alloy and ferro-titanium alloy, and the weight of ferro-niobium alloy and ferro-titanium alloy The ratio is 5:1, the ferro-niobium alloy is FeNb60 (the Nb+Ta content is 61% by weight, the Ta content is 0.2% by weight, the rest is Fe and other unavoidable impurity elements), and the titanium-iron alloy is FeTi40 (the Ti content is 40% by weight) , The re...

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Abstract

The invention provides a cored wire and its application. The cored wire comprises a core layer and an external layer wrapping the core layer, wherein the core layer is a mixture containing a vanadium-nitrogen alloy, iron silicon nitride and an iron alloy. The invention also provides a vanadium and nitrogen alloyed molten steel, and a preparation method thereof. The method comprises the steps of feeding the cored wire into molten steel to be vanadium and nitrogen alloyed, and carrying out vanadium and nitrogen alloying. The invention further provides a vanadium and nitrogen micro-alloyed steel. The vanadium and nitrogen micro-alloyed steel is obtained by casting the vanadium and nitrogen alloyed molten steel. The cored wire can be used for realizing the alloying of molten steel vanadium and nitrogen, can effectively increase the oxygen content as needed without influencing the vanadium content, enables vanadium-containing steel with a higher content of nitrogen to be produced as needed, and can realize high and stable nitrogen recovery rate.

Description

technical field [0001] The invention relates to a cored wire and its application in vanadium-nitrogen alloying of molten steel, a vanadium-nitrogen alloyed molten steel and a preparation method thereof, and a vanadium-nitrogen microalloy steel. Background technique [0002] Vanadium-nitrogen alloy is a new alloy additive that can replace ferrovanadium for the production of microalloyed steel. The addition of vanadium nitrogen 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 amount of vanadium added, thereby reducing the cost. Vanadium nitrogen alloys can be used in structural steel, tool steel, pipe steel, steel bars and cast iron. The application of vanadium-nitrogen alloys in high-strength low-alloy steels can effectively micro-alloy vanadium and...

Claims

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Application Information

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IPC IPC(8): C21C7/00C22C38/12
Inventor 刘明邓通武王建张国才程兴德吴仕富
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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