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Containing nb, cr microalloy construction steel wire rod and its lf furnace production method

A production method and micro-alloying technology, applied in the field of iron and steel metallurgy, can solve the problems of few types and low nitrogen content of vanadium nitride alloys, and achieve the effects of low cost, high nitrogen yield and stable nitrogen yield

Active Publication Date: 2020-02-04
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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  • Containing nb, cr microalloy construction steel wire rod and its lf furnace production method
  • Containing nb, cr microalloy construction steel wire rod and its lf furnace production method
  • Containing nb, cr microalloy construction steel wire rod and its lf furnace production method

Examples

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Comparison scheme
Effect test

Embodiment 1

[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 Heating → 6-machine 6-strand billet continuous casting machine casting into 150mm×150mm billet → billet heating → high-speed wire rolling into Round 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 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 using the function of the converter to blow oxygen to remove C. When the composition of the molten steel is initially smelted to 0.09% C, 0.022% P, and 0.026% S, the temperature is 1674°C When tapping...

Embodiment 2

[0062] 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 Heating→Adding machine 6-strand billet continuous casting machine to cast into 150mm×150mm steel billet→Steel billet heating→High-speed wire rod rolling into Ribbed steel bars.

[0063] 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 steel scrap are initially smelted into molten steel by using the function of the converter to blow oxygen to remove C. When the composition of the molten steel is initially smelted to 0.08% C, 0.022% P, and 0.024% S, the temperature i...

Embodiment 3

[0076] 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 Heating→Adding machine 6-strand billet continuous casting machine to cast into 150mm×150mm steel billet→Steel billet heating→High-speed wire rod rolling into Ribbed steel bars.

[0077] 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 steel scrap are initially smelted into molten steel by using the function of the converter to blow oxygen to remove C. When the composition of the molten steel is initially smelted to 0.12% C, 0.020% P, and 0.023% S, the temperature i...

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Abstract

The invention belongs to the field of ferrous metallurgy, and particularly relates to an Nb and Cr containing microalloy building steel wire rod and an LF furnace production method thereof. The Nb andCr containing microalloy building steel wire rod and the LF furnace production method thereof are provided according to the problems that vanadium nitride alloys selected for preparing nitrogen containing alloy steel in the prior art are low in nitrogen content, few in kind and the like. The steel wire rod comprises, by weight percent, 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 larger than 0.040% of P, not larger than 0.040% of S, 0.010%-0.050% of Nb, 0.10%-0.60% of Cr and the balance Fe and inevitable impurities. The preparation method of the steel wirerod is characterized in that an N containing cored wire is fed into an LF furnace, and N is adjusted to the proper level. The method is simple in operation, the nitrogen yield is high and stable, theproduction cost can be effectively reduced, and the method is worthy of use and popularization.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a wire rod of micro-alloyed construction steel containing Nb 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 refinem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/26C21C7/00C21D8/08
CPCC21C7/0056C21D8/065C21D8/08C22C38/001C22C38/02C22C38/04C22C38/26
Inventor 刘明邓通武雷秀华王西江
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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