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Microalloyed steel, cored wire containing iron alloys, application of cored wire, molten steel and preparation method of molten steel

A technology of cored wire and ferroalloy, which is applied in the field of microalloy steel to achieve the effect of high yield strength and improved yield strength

Inactive Publication Date: 2014-09-10
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

Although vanadium nitride alloys contain vanadium and have high nitrogen content, for different microalloying technology routes in microalloyed steels, especially composite microalloyed steels, such as V-Ti-N, or even V-Ti-Nb -N, also can not meet the demand

Method used

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  • Microalloyed steel, cored wire containing iron alloys, application of cored wire, molten steel and preparation method of molten steel
  • Microalloyed steel, cored wire containing iron alloys, application of cored wire, molten steel and preparation method of molten steel

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preparation example Construction

[0035] The invention provides a method for preparing molten steel. The method comprises: feeding the cored wire of the invention into molten steel to be alloyed with vanadium and nitrogen to perform vanadium-nitrogen alloying.

[0036] According to the preparation method of 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 of the vanadium-nitrogen micro-alloyed steel, it is preferable to perform vanadium-nitrogen alloying under dynamic conditions during the vanadium-nitrogen alloying process. Alloying, 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.

[0037]According to the preparation method of molten steel of the present invention, wherein, in the vanadium-nitrogen alloying process, preferably wh...

Embodiment 1

[0052] A cored wire A1 (with an outer diameter of 13 mm), comprising a core layer and an outer layer wrapping the core layer, the core layer being composed of powders of vanadium-iron alloy, ferrosilicon nitride and iron alloy (with a particle size of less than 2 mm) , the outer layer is a skin made of cold-rolled strip steel (brand St12), wherein, in the powder, contains vanadium-iron alloy (FeV50A, V content is 50.0% by weight, and the rest is Fe and other unavoidable impurity elements): 85% by weight %, ferrosilicon nitride (N content: 36% by weight, Si content: 52% by weight): 10% by weight, iron alloy: 5% by weight. Among them, the ferroalloy is a mixed alloy of ferro-niobium alloy and ferro-titanium alloy, wherein the weight ratio of ferro-niobium alloy to ferro-titanium alloy is 2:1, and the ferro-niobium alloy is FeNb60 (Nb+Ta content is 65% by weight, the rest is Fe and unavoidable other impurity elements), titanium-iron alloy is FeTi40 (Ti content is 40% by weight, t...

Embodiment 2

[0054] It is the same as the cored wire in Example 1, except that, in the cored wire A2, the weight ratio of the ferro-niobium alloy to the ferro-titanium alloy is 1:1.

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Abstract

The invention provides a cored wire containing iron alloys and an application thereof. The cored wire comprises a core and an outer layer wrapping the core, wherein the core is a mixture containing a vanadium-iron alloy, iron-silicon nitride and the iron alloys; the iron alloys are a titanium-iron alloy and / or a niobium-iron alloy. The invention provides molten steel and a preparation method thereof. The method comprises the step of feeding the cored wire into the molten steel to be subjected to vanadium-nitrogen alloying to carry out vanadium-nitrogen alloying. The invention provides microalloyed steel. The cored wire is used for achieving vanadium-nitrogen alloying of the molten steel, can effectively increase the nitrogen content according to the requirements, without affecting the vanadium content, and can produce vanadium-containing steel with higher nitrogen content according to the requirement of the molten steel. The vanadium-nitrogen microalloyed steel obtained after casting the vanadium-nitrogen alloyed molten steel obtained by carrying out vanadium-nitrogen alloying on the molten steel by adopting the cored wire has high yield strength.

Description

technical field [0001] The invention relates to a cored wire containing an iron alloy and its application in vanadium nitrogen alloying of molten steel, a molten steel and a preparation method thereof, and a microalloy steel. Background technique [0002] Microalloyed steel mainly refers to the steel whose performance can be obviously improved by adding a small amount or a trace amount of certain elements in the steel, especially the strength index of the steel. Under the existing technical conditions, microalloyed steel is mainly obtained by adding a small amount or a trace amount of vanadium, niobium and titanium. The mechanism of microalloying is: after adding vanadium, niobium and titanium as trace elements into molten steel, they combine with carbon and nitrogen in molten steel to form carbon and nitrogen compound particles, namely V(C, N), Nb( C, N) and Ti (C, N) particles, these particles have a certain effect of precipitation strengthening and grain refinement, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
Inventor 刘明李正荣王建刘芳邓通武
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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