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Ti-containing microalloy constructional steel bar material and LF furnace 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 and low nitrogen content of vanadium nitride alloy, and achieve the effects of simple operation, high nitrogen yield and high strength

Inactive Publication Date: 2018-03-20
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

[0044] Example 1 Preparation of Ti-containing microalloyed building steel rods by the method of the present invention

[0045] 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.

[0046] 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 scrap steel are initially smelted into molten steel by using the function of the converter to blow oxygen to...

Embodiment 2

[0052] Example 2 Preparation of Ti-containing microalloyed building steel rods by the method of the present invention

[0053] 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.

[0054] 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 0.056%. 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 bl...

Embodiment 3

[0060] Example 3 Preparation of Ti-containing microalloyed building steel rods by the method of the present invention

[0061] 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.

[0062] 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 0.058%. 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 oxygen to...

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Abstract

The invention belongs to the field of steel metallurgy and particularly relates to a Ti-containing microalloy constructional steel bar material and a LF furnace production method thereof. The Ti-containing microalloy constructional steel bar material and the LF furnace production method thereof aim at solving the problems that at present, vanadium nitride alloys selected for producing nitrogen-containing alloy steel are low in nitrogen content, small in number of varieties and the like. The bar material comprises, by weight percentage, 0.15-0.30% of C, 0.30-1.00% of Si, 0.60-1.30% of Mn, 0.0060-0.0180% of N, less than or equal to 0.040% of P, less than or equal to 0.040% of S, 0.010-0.050% of Ti and the balance Fe and inevitable impurities. According to the production method of the Ti-containing microalloy constructional steel bar material, the key point lies in that a N-containing core-spun yarn is fed into a LF furnace after refining is completed, and the N content is adjusted to theproper level. The method is easy to operate, high in nitrogen yield, stable, capable of effectively lowering production cost and worthy of being applied and popularized.

Description

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

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/14C21D8/08C21C7/00
CPCC22C38/02C21C7/0056C21D8/065C21D8/08C22C38/001C22C38/04C22C38/14
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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