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V-containing micro-alloy building steel bar and LF production method thereof

A production method and technology for construction steel, applied in the field of iron and steel metallurgy, can solve the problems of few types, low nitrogen content of vanadium nitride alloy, etc., and achieve the effects of simple operation, high nitrogen yield and lower production cost

Inactive Publication Date: 2018-04-24
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

[0005] Aiming at the problems of low nitrogen content and few types of vanadium nitride alloys used in the preparation of nitrogen-containing alloy steels, the present invention provides a new method for preparing nitrogen-containing alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 uses the inventive method to prepare containing V microalloy building steel bars

[0047] A steel plant adopts the technology of the present invention to produce ribbed steel bars for construction in the converter process with a nominal capacity of 120 tons (the actual steel output is in the range of 120 to 140 tons). The production process is converter smelting → blowing inert gas after the furnace + feeding Core-spun wire → 6-machine 6-strand billet continuous casting machine casting into 150mm×150mm billet → billet heating → rolling into continuous bar rolling production line Ribbed steel bars.

[0048] Firstly, 120 tons of molten iron and 20 tons of steel scrap are added into the converter, and the S content of the added molten iron is 0.052%. After the molten iron and steel scrap are added to the converter, the molten iron and steel scrap are initially smelted into molten steel by utilizing the function of the converter to remove C by blowing oxygen....

Embodiment 2

[0054] Example 2 Preparation of V-containing microalloyed building steel bars by the method of the present invention

[0055] A steel plant adopts the technology of the present invention to produce ribbed steel bars for construction in the converter process with a nominal capacity of 120 tons (the actual steel output is in the range of 120 to 140 tons). The production process is converter smelting → blowing inert gas after the furnace + feeding Core-spun wire → 6-machine 6-strand billet continuous casting machine casting into 150mm×150mm billet → billet heating → rolling into continuous bar rolling production line Ribbed steel bars.

[0056] Firstly, 120 tons of molten iron and 20 tons of steel scrap are added into the converter, and the S content of the added molten iron is 0.052%. After the molten iron and steel scrap are added to the converter, the molten iron and steel scrap are initially smelted into molten steel by using the function of the converter to remove C by blo...

Embodiment 3

[0062] Example 3 Preparation of V-containing microalloyed building steel bar by the method of the present invention

[0063] A steel plant adopts the technology of the present invention to produce ribbed steel bars for construction in the converter process with a nominal capacity of 120 tons (the actual steel output is in the range of 120 to 140 tons). The production process is converter smelting → blowing inert gas after the furnace + feeding Core-spun wire→6-machine 6-strand billet continuous casting machine casting into 150mm×150mm steel billet→steel billet heating→rolling into continuous bar rolling production line Ribbed steel bars.

[0064] Firstly, 120 tons of molten iron and 20 tons of steel scrap are added into the converter, and the S content of the added molten iron is 0.055%. After the molten iron and steel scrap are added to the converter, the molten iron and steel scrap are initially smelted into molten steel by using the function of the converter to blow oxyge...

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Abstract

The invention belongs to the field of iron and steel metallurgy and particularly relates to a V-containing micro-alloy building steel bar and an LF production method thereof. The V-containing micro-alloy building steel bar and the LF production method thereof are provided in order to solve the problems that a vanadium nitride alloy selected for preparing nitrogen-containing alloy steel in the prior art is low in nitrogen content, small in variety and the like. The V-containing micro-alloy building steel bar comprises the components of, by weight, 0.15%-0.30% of C, 0.30%-1.00% of Si, 0.60%-1.30% of Mn, 0.0060%-0.0180% of N, no more than 0.040% of P, no more than 0.040% of S, 0.010%-0.160% of V and the balance Fe and inevitable impurities. The key point of the preparation method of the V-containing micro-alloy building steel bar is that after LF refining, core-spun yarn is fed in a steel ladle for adjusting the N content to the appropriate level. The method is easy to operate, the nitrogen yield is high and stable, the production cost can be further reduced effectively, and thus the V-containing micro-alloy building steel bar is worth using and popularizing.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a V-containing microalloy building steel bar and a production method thereof in an LF furnace. 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 small 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 signific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C21C7/00C21D8/08
CPCC22C38/02C21C7/0056C21D8/065C21D8/08C22C38/001C22C38/04C22C38/12
Inventor 郭跃华刘明邓通武赵志强
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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