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Building steel bar containing V, Ti and Cr microalloys as well as LF (ladle furnace) production method of building steel bar

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

Inactive Publication Date: 2018-03-23
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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  • Building steel bar containing V, Ti and Cr microalloys as well as LF (ladle furnace) production method of building steel bar
  • Building steel bar containing V, Ti and Cr microalloys as well as LF (ladle furnace) production method of building steel bar
  • Building steel bar containing V, Ti and Cr microalloys as well as LF (ladle furnace) production method of building steel bar

Examples

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Effect test

Embodiment 1

[0046] Embodiment 1 uses the inventive method to prepare containing V, Ti, Cr microalloy building steel bar

[0047] A steel plant adopts the technology of the present invention in the converter process with a nominal capacity of 120 tons (the actual steel output is in the range of 120-140 tons) to produce belted steel bars for construction. The production process is converter smelting → blowing inert gas after the furnace → LF furnace Electric heating → 6-machine 6-strand billet continuous casting machine casting into 150mm×150mm billet → billet heating → rolling into continuous bar rolling production line With 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 0.048%. 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 blowing oxyg...

Embodiment 2

[0058] Embodiment 2 uses the inventive method to prepare containing V, Ti, Cr microalloy construction steel bar

[0059] A steel plant adopts the technology of the present invention in the converter process with a nominal capacity of 120 tons (the actual steel output is in the range of 120-140 tons) to produce belted steel bars for construction. The production process is converter smelting → blowing inert gas after the furnace → LF furnace Electric heating → 6-machine 6-strand billet continuous casting machine casting into 200mm×200mm billet → billet heating → rolling into continuous bar rolling production line With steel bars.

[0060] 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 utilizing the function of the converter to remove C by blow...

Embodiment 3

[0070] Embodiment 3 uses the inventive method to prepare containing V, Ti, Cr microalloy building steel bar

[0071] A steel plant adopts the technology of the present invention in the converter process with a nominal capacity of 120 tons (the actual steel output is in the range of 120-140 tons) to produce belted steel bars for construction. The production process is converter smelting → blowing inert gas after the furnace → LF furnace Electric heating → 6-machine 6-strand billet continuous casting machine casting into 200mm×200mm billet → billet heating → rolling into continuous bar rolling production line With steel bars.

[0072] 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 remove C by blowing oxyg...

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Abstract

The invention belongs to the field of iron and steel metallurgy, and particularly relates to a building steel bar containing V, Ti and Cr microalloys as well as an LF (ladle furnace) production methodof the building steel bar. In order to solve the problems that vanadium nitride alloys selected for the preparation of nitrogen alloy steel are low in nitrogen content, and the types of the vanadiumnitride alloys are less, the building steel bar and the LF production method are provided. The building steel bar comprises the following components in percentage 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, not more than 0.040% of P, not more than 0.040% of S, 0.010-0.100% of V, 0.010-0.030% of Ti, 0.10-060% of Cr, and the balance Fe and inevitable impurities. The key of a method for preparing the building steel bar is to feed a nitrogen-containing cored wire into a steel ladle after LF refining so as to adjust the nitrogen content to an appropriate level; the LF production method is simple to operate; the nitrogen yield is high and stable; furthermore, the production cost can be effectively reduced; and the building steel bar and the LF productionmethod are worthy of popularization and utilization.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a V, Ti, Cr microalloy construction steel rod 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 signifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/08C21C7/00C22C38/02C22C38/04C22C38/24C22C38/28
CPCC21D8/08C21C7/0056C21D8/065C22C38/001C22C38/02C22C38/04C22C38/24C22C38/28
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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