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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

A technology of vanadium nitrogen alloy and cored wire, which is applied in the fields of cored wire and its application, vanadium nitrogen alloyed molten steel and its preparation, and vanadium nitrogen microalloy 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

AI Technical Summary

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 in the vanadium nitrogen alloy, and the vanadium in the existing products Nitrogen alloys usually have three grades of VN12, VN14 and VN16. Generally, the ratios of nitrogen and vanadium of the three grades are 12:78(N:V); 14:78(N:V); 16:78(N: V)

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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preparation example Construction

[0030] The invention provides a method for preparing vanadium-nitrogen alloyed molten steel. The method comprises: feeding the cored wire of the invention into molten steel to be vanadium-nitrogen alloyed for vanadium-nitrogen alloying.

[0031] 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 in order to improve the yield strength and tensile strength of the vanadium-nitrogen micro-alloyed steel, it is preferable to carry out the vanadium-nitrogen alloying process , Carry out vanadium nitrogen alloying under dynamic conditions, dynamic conditions can be achieved by shaking or rotating the ladle, for example, the ladle can be shaken while the cored wire is fed into the molten steel in the ladle through the wire feeding device.

[0032] According to the preparation method of vanadium-nitrogen alloyed molten steel of the pre...

Embodiment 1

[0047] A cored wire A1 (with an outer diameter of 12mm), including a core layer and an outer layer wrapping the core layer, the core layer is composed of vanadium nitrogen alloy and ferrosilicon nitride powder (particle size is less than 2mm), The outer layer is a skin made of cold-rolled steel strip (brand St12). The weight ratio of the above-mentioned vanadium-nitrogen alloy (VN16, vanadium content 78% by weight, N content 16% by weight) and ferrosilicon nitride is: vanadium-nitrogen alloy: 95% by weight, ferrosilicon nitride (N content: 36% by weight, Si content: 52% by weight): 5% by weight.

Embodiment 2

[0049] A cored wire A2 (with an outer diameter of 12 mm), comprising a core layer and an outer layer wrapping the core layer, the core layer being composed of vanadium nitrogen alloy and ferrosilicon nitride powder (particle size less than 3 mm), The outer layer is a skin made of cold-rolled strip steel (grade St12), the above-mentioned vanadium-nitrogen alloy (VN16, vanadium content 78 wt%, N content 16 wt%) and ferrosilicon nitride (N content 36 wt%, Si content is 52% by weight) and the weight ratio is: vanadium nitrogen alloy: 51% by weight, ferrosilicon nitride: 49% by weight.

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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 powder containing a vanadium-nitrogen alloy and iron silicon nitride. 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. The vanadium and nitrogen micro-alloyed steel obtained after casting the vanadium and nitrogen alloyed molten steel produced by carrying out molten steel vanadium and nitrogen alloying on the cored wire has high yield strength and tensile strength.

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): C22C35/00C22C33/06
Inventor 刘明王建张国才程兴德吴仕富邓通武
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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