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Microalloy constructional steel coil rod containing V, Nb and Ti and LF furnace production method of microalloy constructional steel coil rod

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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 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 Ribbed steel bars.

[0047] 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 scrap steel 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, 0.020% P, and 0.028% S, the temperature is 1674°C When ...

Embodiment 2

[0057] 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 Ribbed steel bars.

[0058] 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 utilizing the function of the converter to remove C by blowing oxygen. When the composition of the molten steel is initially smelted to 0.12% C, 0.019% P, and 0.023% S, the temperature is 1674°C...

Embodiment 3

[0068] 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 200mm×200mm billet → billet heating → high-speed wire rolling into Ribbed steel bars.

[0069] 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 scrap steel 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 oxygen. When the composition of the molten steel is initially smelted to 0.07% C, 0.023% P, and 0.019% S, the temperature is 1680°C Wh...

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Abstract

The invention belongs to the field of steel metallurgy and particularly relates to a microalloy constructional steel coil rod containing V, Nb and Ti and an LF furnace production method of the microalloy constructional steel coil rod. The microalloy constructional steel coil rod containing V, Nb and Ti and the LF furnace production method of the microalloy constructional steel coil rod 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 coil rod 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, 0.010-0.080% of V, 0.010-0.030% of Nb, 0.010-0.030% of Ti and the balance Fe and inevitable impurities. According to the production method of the microalloy constructional steel coil rod, the key point lies in that a N-containing core-spun yarn is fed into a LF furnace, and the N content is adjusted to the proper 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 microalloy construction steel wire rod containing V, Nb and Ti 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/14C21D8/08C21C7/00
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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