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Nb-containing micro-alloy constructional steel bar and LF (Low-Frequency) furnace production method thereof

A production method and construction steel technology, 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 high strength

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

[0047] Example 1 Preparation of Nb-containing microalloyed construction steel rods by the method of the present invention

[0048] 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 (actual steel output is within the range of 120-140 tons). 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 Ribbed steel bars.

[0049] 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 0.051%. 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...

Embodiment 2

[0055] Example 2 Preparation of Nb-containing microalloyed construction steel rods by the method of the present invention

[0056] 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 (actual steel output is within the range of 120-140 tons). 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 Ribbed steel bars.

[0057] 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 0.054%. 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 using the function of the converter to blow oxy...

Embodiment 3

[0063] Example 3 Preparation of Nb-containing microalloyed construction steel rods by the method of the present invention

[0064] 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 (actual steel output is within the range of 120-140 tons). 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 Ribbed steel bars.

[0065] 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 blow oxy...

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Abstract

The invention belongs to the field of steel and iron metallurgy and particularly relates to an Nb-containing micro-alloy constructional steel bar and an LF furnace production method thereof. Aiming atthe problems about low nitrogen content and few types of vanadium nitride used by an existing method for preparing nitrogen-containing alloy steel, the invention provides the Nb-containing micro-alloy constructional steel bar and the LF furnace production method thereof. The bar comprises the following components in percentage by weight: 0.15 to 0.30 percent of C, 0.30 to 1.00 percent of Si, 0.60to 1.30 percent of Mn, 0.0060 to 0.0180 percent of N, smaller than or equal to 0.040 percent of P, smaller than or equal to 0.040 percent of S, 0.010 to 0.050 percent of Nb and the balance of Fe andinevitable impurities. The key points of a preparation method of the Nb-containing micro-alloy constructional steel bar are that an N-containing core-spun yarn is fed into the LF furnace after refining is ended, and the content of N is regulated to a suitable level. The method provided by the invention is simple to operate, high and stable in nitrogen yield, also capable of effectively lowering the production cost and worthy of popularization and application.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a 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 can sig...

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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