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Method for producing HRB 600 high-strength steel through micro-alloying

A technology of micro-alloying and high-strength steel, which is applied in the field of steel production, can solve the problems of small production scale of high-strength steel bars, and achieve the effect of uniform temperature composition

Active Publication Date: 2014-07-02
SICHUAN DAZHOU IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Over the years, although my country has adopted many measures such as revising specifications and launching demonstration projects to promote the application of high-strength steel bars, compared with developed countries, the strength of steel bars used in my country's construction industry is generally 1-2 grades lower, and the production scale of high-strength steel bars It is also very small, especially the production of 600MPa high-strength steel bars has not yet started in my country.

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  • Method for producing HRB 600 high-strength steel through micro-alloying
  • Method for producing HRB 600 high-strength steel through micro-alloying
  • Method for producing HRB 600 high-strength steel through micro-alloying

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Embodiment 1

[0034] The method for producing HRB600 high-strength steel by microalloying provided by the present embodiment comprises the following steps:

[0035] (1) Put the molten iron into the converter, wherein the carbon content of the molten iron is not less than 3.6%, the temperature of the molten iron is between 1280°C and 1330°C, the silicon content is not more than 0.60%, the P content is not more than 0.100%, and the S content is not more than 0.080%;

[0036] (2) Desulfurization of molten iron pretreatment, desulfurization of molten iron to less than 0.050%, and the slag in the molten iron must be removed after desulfurization, so that the amount of slag in the molten iron is less than or equal to 0.5%, and the temperature of the molten iron after desulfurization is not lower than 1250°C ;

[0037] (3), temperature measurement and sampling of molten iron, so that the composition and temperature of molten iron entering the furnace must meet the requirements of conditions (1) a...

Embodiment 2

[0054] The method for producing HRB600 high-strength steel by microalloying provided by the present embodiment comprises the following steps:

[0055] (1) Put the molten iron into the converter, wherein the carbon content of the molten iron is not less than 3.6%, the temperature of the molten iron is between 1280°C and 1330°C, the silicon content is not more than 0.60%, the P content is not more than 0.100%, and the S content is not more than 0.080%;

[0056] (2) Desulfurization of molten iron pretreatment, desulfurization of molten iron to less than 0.050%, and the slag in the molten iron must be removed after desulfurization, so that the amount of slag in the molten iron is less than or equal to 0.5%, and the temperature of the molten iron after desulfurization is not lower than 1250°C ;

[0057] (3), temperature measurement and sampling of molten iron, so that the composition and temperature of molten iron entering the furnace must meet the requirements of conditions (1) a...

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Abstract

The invention discloses a method for producing HRB 600 high-strength steel through micro-alloying. The method comprises the following steps: firstly, blast-furnace hot metal desulfurized is subjected to deslagging, temperature-measuring and sampling, so that the slag rate is not more than 0.5%, and then the blast-furnace hot metal is to be blown; before blowing, scrap steel is added in advance, after blowing, slag forming constituents such as lime are added in advance, the oxygen working pressure is 0.80 to 0.90 MPa, a rocking furnace is used for measuring the temperature and sampling after the blowing is finished, the temperature measurement and the sampling are finished within 2 minutes, if qualified, the blast-furnace hot metal is directly poured into the furnace for steel tapping, while if not qualified, the blast-furnace hot metal needs steel tapping after reblowing, at the same time, silicomanganese and ferrosilicon are added to be subjected to the micro-alloying operation, and then ferroniobium, ferrochrome, ferrovanadium and ferrotitanium are added to be subjected to the micro-alloying operation, and finally the blast-furnace hot metal is subjected to argon blowing modulation to enable the temperature and the compositions to be uniform. Compared with the prior art, the method for producing HRB 600 high-strength steel through micro-alloying operations can produce qualified HRB 600 high-strength steel, and fills a gap that HRB 600 high-strength steel cannot be produced in China.

Description

technical field [0001] The invention relates to the field of iron and steel production, specifically a method for producing HRB600 high-strength steel by microalloying. Background technique [0002] At present, my country is intensifying the promotion and application of high-strength steel bars, and the time for a large number of high-strength steel bars to be used is ripe. The promotion and application of high-strength steel bars can not only help the iron and steel industry to achieve the arduous task of structural adjustment, but also promote the quality and life of various buildings and infrastructure in my country. It has very high practical feasibility and significant economic and social benefits. Promoting the application of high-strength steel bars and improving the grade, quality, and stability of steel bars will promote the application of "reduction" in steel and support the transformation and upgrading of the construction industry; at the same time, it will ease t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/30
CPCY02P10/20
Inventor 王皎月龚波张琦喻春亮杨海波
Owner SICHUAN DAZHOU IRON & STEEL GROUP
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