Microalloyed weathering steel, cored wire, application of cored wire, molten steel and preparation method of molten steel

A technology of cored wire and molten steel, which is applied in the field of cored wire and vanadium-nitrogen alloying of molten steel to achieve the effect of high yield strength and improved yield strength

Inactive Publication Date: 2014-09-10
SICHUAN PAN YAN TECH
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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 weathering steel, cored wire, application of cored wire, molten steel and preparation method of molten steel
  • Microalloyed weathering steel, cored wire, application of cored wire, molten steel and preparation method of molten steel

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preparation example Construction

[0032] 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.

[0033] 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 steel, it is preferable to perform vanadium-nitrogen alloying under dynamic conditions during the vanadium-nitrogen alloying process. The condition can be achieved by shaking or turning the ladle, for example, the ladle can be shaken while the cored wire is being fed into the molten steel in the ladle by the wire feeding device.

[0034] According to the preparation method of molten steel of the present invention, wherein, in the vanadium-nitrogen alloying process, preferably when the cored wire is fed into the molten steel...

Embodiment 1

[0051] 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 is composed of vanadium-iron alloy and silicon-manganese nitride powder (with a particle size of 2 mm or less), the outer layer The layer is a skin made of cold-rolled steel strip (brand St12), and the weight ratio of the above-mentioned iron-vanadium alloy (FeV50A, V content is 50.0% by weight, the rest is Fe and other unavoidable impurity elements) and silicon-manganese nitride is: Vanadium iron alloy: 90% 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 other unavoidable impurity elements): 10% by weight .

Embodiment 2

[0053] A cored wire A2 (with an outer diameter of 13 mm), comprising a core layer and an outer layer wrapping the core layer, the core layer is composed of vanadium-iron alloy and silicon-manganese nitride powder (particle diameter is less than 3 mm), the outer layer The layer is a skin made of cold-rolled steel strip (brand St12), and the weight ratio of the above-mentioned iron-vanadium alloy (FeV50A, V content is 50.0% by weight, the rest is Fe and other unavoidable impurity elements) and silicon-manganese nitride is: Vanadium iron alloy: 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 other unavoidable impurity elements): 20% by weight .

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Abstract

The invention provides a cored wire 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 and silicon-manganese nitride. 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 weathering 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 and its application in vanadium-nitrogen alloying of molten steel, a molten steel and a preparation method thereof, and a weather-resistant 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, which can s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00
Inventor 刘明张国才王义成伍兵陆颉毕新强仲剑丽陈平刘斌罗开金张起梦
Owner SICHUAN PAN YAN TECH
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