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Core spun yarn and application thereof, vanadium nitrogen alloyed molten steel and preparation method thereof, and vanadium nitrogen microalloyed 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 stable recovery rate and high yield strength and tensile strength , High recovery effect

Inactive Publication Date: 2014-09-24
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 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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  • Core spun yarn and application thereof, vanadium nitrogen alloyed molten steel and preparation method thereof, and vanadium nitrogen microalloyed steel
  • Core spun yarn and application thereof, vanadium nitrogen alloyed molten steel and preparation method thereof, and vanadium nitrogen microalloyed steel

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preparation example Construction

[0034]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.

[0035] 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.

[0036] According to the preparation method of vanadium-nitrogen alloyed molten steel of the pres...

Embodiment 1

[0051] A cored wire A1 (with an outer diameter of 12 mm), including a core layer and an outer layer wrapping the core layer. The core layer is made of vanadium-nitrogen alloy, ferrosilicon nitride, iron alloy and fluorite powder (particle size is 2mm), the outer layer is made of cold-rolled strip steel (brand St12), wherein, in the powder, vanadium nitrogen alloy (VN16, vanadium content 78% by weight, N content 16% by weight): 94% by weight , ferrosilicon nitride (N content: 36% by weight, Si content: 52% by weight): 4% by weight, ferroalloy: 1% by weight, fluorite (CaF 2 content is 95% by weight): 1% by weight, wherein the iron alloy is a mixed alloy of ferroniobium alloy and ferro-titanium alloy, wherein the weight ratio of ferro-niobium alloy to ferro-titanium alloy is 1:1, and the ferro-niobium alloy is FeNb60A (Nb+Ta content is 61 % by weight, wherein the Ta content is 0.2% by weight, the rest is Fe and other unavoidable impurity elements), and the ferro-titanium alloy is...

Embodiment 2

[0053] A cored wire A2 (with an outer diameter of 12 mm), including a core layer and an outer layer wrapping the core layer, the core layer is made of vanadium nitrogen alloy, ferrosilicon nitride, iron alloy and fluorite powder (particle size is 3mm or less), the outer layer is made of cold-rolled strip steel (brand St12), wherein, the powder contains vanadium-nitrogen alloy (VN16, vanadium content 78% by weight, N content 16% by weight): 51% by weight , ferrosilicon nitride (N content: 36% by weight, Si content: 52% by weight): 9% by weight, ferroalloy: 25% by weight, fluorite (CaF 2 content is 95% by weight): 15% by weight, wherein the iron alloy is a mixed alloy of ferroniobium alloy and ferro-titanium alloy, wherein the weight ratio of ferro-niobium alloy to ferro-titanium alloy is 5:1, and the ferro-niobium alloy is FeNb60A (Nb+Ta content is 61 % by weight, wherein the Ta content is 0.2% by weight, the rest is Fe and other unavoidable impurity elements), and the ferro-ti...

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Abstract

The invention provides a core spun yarn and application thereof. The core spun yarn comprises a core layer and an outer layer wrapping the core layer, and the core layer is a mixture comprising vanadium nitrogen alloy, ferro-silicon nitride, iron alloy and fluorspar. The invention provides vanadium nitrogen alloy molten steel and a preparation method thereof, and the method includes feeding of the core spun yarn into the to-be-vanadium and nitrogen alloyed molten steel for vanadium nitrogen alloying. The invention provides vanadium nitrogen microalloyed steel, and the vanadium nitrogen microalloyed steel is casted by the vanadium and nitrogen alloyed molten steel. The core spun yarn is used for realizing molten steel vanadium and nitrogen alloying, nitrogen content can be effectively increased without affecting the vanadium content according to the need, vanadium containing steel with higher nitrogen content can be produced in the need of the molten steel, and the recovery rate of nitrogen is high and stable. The vanadium nitrogen microalloyed steel casted by the vanadium and nitrogen alloyed molten steel produced by use of the core spun yarn for the molten steel vanadium and nitrogen alloying is high in 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): C21C7/00
Inventor 刘明吴仕富张国才程兴德王建邓通武
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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