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Micro-alloy building steel bar containing V, Nb, Ti and Cr and LF production method of micro-alloy building steel bar

A production method and construction steel technology, applied in the production of Cr micro-alloyed construction steel bars and their LF furnaces, Nb, Ti, and V-containing fields, can solve the problems of low nitrogen content and few types of vanadium nitride alloys, and achieve nitrogen High yield, simple operation, and stable nitrogen yield

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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  • Micro-alloy building steel bar containing V, Nb, Ti and Cr and LF production method of micro-alloy building steel bar
  • Micro-alloy building steel bar containing V, Nb, Ti and Cr and LF production method of micro-alloy building steel bar
  • Micro-alloy building steel bar containing V, Nb, Ti and Cr and LF production method of micro-alloy building steel bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 uses the inventive method to prepare containing V, Nb, 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 0.049%. 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 2

[0057] Example 2 Preparation of V, Nb, Ti, Cr Microalloyed Construction Steel Rods Using the Method of the Present Invention

[0058] 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.

[0059] 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 0.053%. 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 ox...

Embodiment 3

[0069] Embodiment 3 uses the inventive method to prepare containing V, Nb, Ti, Cr microalloy building steel bar

[0070] 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.

[0071] 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 scrap steel are initially smelted into molten steel by using the function of the converter to remove C by blowing ...

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Abstract

The invention belongs to the field of steel and iron metallurgy and particularly relates to a micro-alloy building steel bar containing V, Nb, Ti and Cr and an LF production method of the micro-alloybuilding steel bar to solve the problem that a selected vanadium nitride alloy for preparing nitrogen-containing alloy steel is low in nitrogen content and few in variety. The 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, 0.040% or the less of P, 0.040% or the less of S, 0.010-0.080% of V, 0.010-0.030% of Nb, 0.010-0.030% of Ti, 0.10-0.60% of Cr and the balance Fe and inevitable impurities. The key of the preparation method is that after refining in an LF, an N-containing core-spun yarn is fed, and N is adjusted to the appropriate level. According to the LF production method, operation is easy, the nitrogen yielding rate is high and stable, the production cost can further be effectively reduced, and thus the micro-alloy building steel bar and the LF production method are worthy of being used and popularized.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a microalloy building steel bar containing V, Nb, Ti and Cr 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, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/26C22C38/28C21C7/00C21D8/08
CPCC22C38/02C21C7/0056C21D8/065C21D8/08C22C38/001C22C38/04C22C38/24C22C38/26C22C38/28
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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