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V and Nb-contained microalloy construction steel rod and LF furnace preparation method thereof

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: 2018-04-24
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, Nb 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 scrap steel are added into the converter, and the S content of the added molten iron is less than 0.060%. After the molten iron and steel scrap are added to the converter, the molten iron and scrap steel are initially smelted into molten steel by utilizing the function of the converter to remove C by bl...

Embodiment 2

[0054] Embodiment 2 prepares containing V, Nb microalloy construction steel bar with the inventive method

[0055] 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.

[0056] Firstly, 120 tons of molten iron and 20 tons of scrap steel are added into the converter, and the S content of the added molten iron is less than 0.060%. After the molten iron and steel scrap are added to the converter, the molten iron and scrap steel are initially smelted into molten steel by utilizing the function of the converter to remove C by ...

Embodiment 3

[0062] Embodiment 3 prepares containing V, Nb microalloy construction steel bar with the inventive method

[0063] 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.

[0064] Firstly, 120 tons of molten iron and 20 tons of scrap steel are added into the converter, and the S content of the added molten iron is less than 0.060%. After the molten iron and steel scrap are added to the converter, the molten iron and scrap steel are initially smelted into molten steel by utilizing the function of the converter to remove C by ...

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PUM

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Abstract

The invention belongs to the field of steel and iron metallurgy, and in particular, relates to a V and Nb-contained microalloy construction steel rod and a LF furnace preparation method thereof. Aiming at the problems of low nitrogen content and few types of vanadium nitride alloys selected for traditional preparation of nitrogen-contained alloy steel, the invention provides the V and Nb-containedmicroalloy construction steel rod and the LF furnace preparation method thereof. The rod 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, P not more than 0.040%, S not more than 0.040%, 0.010-0.100% of V, 0.010-0.030% of Nb, and the balance of Fe and inevitable impurities. The preparation method is characterizedin that N-contained core-spun yarns are fed after refining in a LF furnace and N is adjusted to a proper level. The method is simple in operation; the nitrogen yield is high and stable; the productioncost can be effectively reduced; and the method deserves popularization and application.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a V and Nb-containing microalloy construction 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 c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C21D8/06C21D8/08C21C7/00C22C33/06
CPCC21C7/0056C21D8/065C21D8/08C21D2211/005C21D2211/009C22C33/06C22C38/001C22C38/02C22C38/04C22C38/12Y02P10/20
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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