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Vanadium-containing microalloyed steel, cored wire containing niobium-iron alloy and iron-calcium alloy, application of cored wire, molten steel and preparation method of molten steel

A technology of niobium-iron alloy and vanadium-iron alloy, which is applied in the fields of vanadium-containing micro-alloy steel, ferroniobium-containing alloy and iron-calcium alloy cored wire and its application, molten steel and its preparation, to achieve the effect of increased yield strength and high yield strength

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

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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  • Vanadium-containing microalloyed steel, cored wire containing niobium-iron alloy and iron-calcium alloy, application of cored wire, molten steel and preparation method of molten steel
  • Vanadium-containing microalloyed steel, cored wire containing niobium-iron alloy and iron-calcium alloy, application of cored wire, molten steel and preparation method of molten steel

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preparation example Construction

[0034] 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.

[0035] According to the preparation method of molten steel of the present invention, in order to facilitate the fast 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 carry out the vanadium-nitrogen alloying process 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.

[0036]According to the preparation method of molten steel of the present invention, wherein, in the vanadium-nitrogen alloying process, ...

Embodiment 1

[0052] A kind of cored wire A1 (outer diameter is 13mm), comprises core layer and the outer layer of wrapping core layer, and described core layer is made of the powder material of vanadium-iron alloy, silicon manganese nitride, ferro-niobium alloy and iron-calcium alloy (particle size 2mm or less), the outer layer is 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 impurities element): 80% by weight, silicon manganese nitride (N content is 28% by weight, Si content is 40% by weight, Mn content is 10% by weight, and the rest is a small amount of Fe and unavoidable other impurity elements): 10% by weight , ferroniobium alloy (FeNb60, Nb+Ta content is 65% by weight, the rest is Fe and other unavoidable impurity elements): 5% by weight, iron-calcium alloy (Ca content is 30% by weight, the rest is Fe and unavoidable other impurity elements) impurity ele...

Embodiment 2

[0054] A kind of cored wire A2 (outer diameter is 13mm), comprises core layer and the outer layer of wrapping core layer, and described core layer is made of the powder material of vanadium-iron alloy, silicon manganese nitride, ferro-niobium alloy and iron-calcium alloy (particle size 2mm or less), the outer layer is 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 impurities element): 65% by weight, silicon manganese nitride (N content is 28% by weight, Si content is 40% by weight, Mn content is 10% by weight, and the rest is a small amount of Fe and unavoidable other impurity elements): 15% by weight , ferroniobium alloy (FeNb60, Nb+Ta content is 65% by weight, the rest is Fe and other unavoidable impurity elements): 10% by weight, iron-calcium alloy (Ca content is 30% by weight, the rest is Fe and unavoidable other impurity elements) impurity el...

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Abstract

The invention provides a cored wire containing a niobium-iron alloy and an iron-calcium alloy 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, silicon-manganese nitride, the niobium-iron alloy and the iron-calcium 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 vanadium-containing 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 weathering 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, and the relative corrosion rate of steel can not be affected.

Description

technical field [0001] The invention relates to a cored wire containing niobium-iron alloy and iron-calcium alloy and its application in vanadium-nitrogen alloying of molten steel, a molten steel and a preparation method thereof, and a vanadium-containing 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 precip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
Inventor 刘明邓通武张国才仲剑丽李正荣
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP