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Cored wire containing titanium and nitrogen and application thereof

A technology of cored wire and core layer, which is applied in the field of iron and steel smelting, can solve the problems of affecting the quality stability of iron and steel products, the waste of precious microalloying element resources, and the low precipitation rate of carbonitriding substances, and achieves good promotion and application prospects. The effect of saving titanium resources and universal adaptability

Inactive Publication Date: 2021-02-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: the carbonitride point precipitation rate of vanadium, niobium, and titanium is still low, there are more than 20% of microalloying elements that have not been precipitated, and there are some carbonitride substance point precipitates with a size of more than 100nm. It leads to the waste of precious microalloying element resources, and also affects the stability of steel product quality to a certain extent
In addition, CN201410439695.3 discloses a method for improving the strength and toughness of medium-carbon V steel, and CN201410527716.7 discloses a method for controlling the size and quantity of refined VN precipitates. The above method can make more than 80% of VN precipitates in steel The particle size is in the range of 20nm to 100nm, but there are still some VN precipitated phase particles above 100nm and V microalloying elements that have not precipitated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 Application of cored wire of the present invention

[0027] Titanium-containing and nitrogen-containing cored wire for molten steel alloying, including a core layer and an outer skin layer, the core layer is composed of nano-titanium nitride powder with a size less than 100nm, and the core layer is wrapped with cold-rolled strip steel The outer skin layer, the outer diameter of the entire cored wire is 13mm. Feed into the molten steel in the ladle through the wire feeding device, and the wire feeding speed is 3.0m / s. Shake the ladle while feeding the wire, and at the same time spray inert gas to the contact area between the cored wire and molten steel. After testing, the precipitation rate of titanium element precipitation particles is 98.2%, and the proportion of precipitation particle sizes smaller than 100nm is 99.2%.

Embodiment 2

[0028] Embodiment 2 Application of cored wire of the present invention

[0029] Titanium-containing and nitrogen-containing cored wire for molten steel alloying, including a core layer and an outer skin layer, the core layer is composed of nano-titanium nitride powder with a size less than 100nm, and the core layer is wrapped with cold-rolled strip steel The outer skin layer, the outer diameter of the entire cored wire is 4mm. It is fed into the molten steel in the crystallizer of continuous casting through the wire feeding device, and the wire feeding speed is 1.2m / s. Electromagnetic stirring or vibration is performed on the mold while feeding the wire, and inert gas is sprayed on the contact area between the cored wire and the molten steel at the same time. After testing, the precipitation rate of titanium element precipitation particles is 98.8%, and the proportion of precipitation particle sizes smaller than 100nm is 99.6%.

Embodiment 3

[0030] Embodiment 3 Application of cored wire of the present invention

[0031] Titanium-containing and nitrogen-containing cored wire for molten steel alloying, including a core layer and an outer skin layer, the core layer is composed of nano-titanium nitride powder with a size less than 100nm, and the core layer is wrapped with cold-rolled strip steel The outer skin layer, the outer diameter of the entire cored wire is 14mm. It is fed into the molten steel in the die-casting mold through the wire feeding device, and the wire feeding speed is 2.4m / s. While feeding the wire, the mold is electromagnetically stirred or shaken, and at the same time, an inert gas is sprayed on the contact area between the cored wire and the molten steel. After testing, the precipitation rate of titanium element precipitation particles is 99.3%, and the proportion of precipitation particle sizes smaller than 100nm is 100%.

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PUM

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Abstract

The invention relates to a cored wire containing titanium and nitrogen and application thereof, and belongs to the technical field of iron and steel smelting. According to the cored wire containing the titanium and nitrogen, the core layer of the cored wire is made from nanometer titanium nitride powder, wherein the size of the nanometer titanium nitride powder is smaller than 100 nm. The invention further provides the application of the cored wire in alloying of liquid steel and a method for alloying of the liquid steel. When alloying of the liquid steel is conducted by using the cored wire containing the titanium and nitrogen, almost all of the titanium in the steel exists in the form of precipitation particles, and the size of almost all of the precipitation particles is smaller than 100 nm. The precipitation rate of the titanium precipitation particles is equal to or higher than 98%; and the ratio of the precipitation particles with the size smaller than 100 nm is equal to or higher than 99%.

Description

technical field [0001] The invention relates to a cored wire containing titanium and nitrogen and an application thereof, belonging to the technical field of iron and steel smelting. Background technique [0002] Microalloyed steel mainly refers to the steel that adds a trace or a small amount of one or several alloying elements to the steel to significantly improve the comprehensive properties of strength, toughness, ductility, weldability and fatigue resistance, especially to improve Strength index of steel. Under the existing technical conditions, microalloyed steel is mainly prepared by adding a trace or a small amount of one or more elements in vanadium, niobium, titanium and the like. The mechanism of microalloying is: after vanadium, niobium or titanium as trace elements are added to molten steel, they combine with carbon or nitrogen in molten steel to form carbon or nitrogen compound precipitation particles, that is, V (C, N), Nb ( C, N) or Ti (C, N) precipitated p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00B22D1/00B22D11/11
CPCB22D1/00B22D11/11C21C7/0056
Inventor 郭跃华刘明邓通武罗志强
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP