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A kind of nb, v composite 700mpa grade high-strength anti-seismic reinforcement steel and its production method

A technology of seismic reinforcement and production method, which is applied in the field of Nb, V composite 700MPa grade high-strength seismic reinforcement steel, can solve the problems of low strength of seismic reinforcement steel, and achieves the effect of facilitating pouring, avoiding overoxidation and preventing secondary pollution.

Active Publication Date: 2021-08-03
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the strength of existing anti-seismic reinforcement steel is generally low, the invention provides a kind of Nb, V composite 700MPa grade high-strength anti-seismic reinforcement steel and its production method; adopt Nb, V composite microalloying, converter steelmaking (or electric arc furnace ), continuous bar rolling mills, under the existing technology and equipment level of steel enterprises, realize large-scale industrial production of 700MPa high-strength seismic steel bars to meet the needs of high-rise, long-span concrete building structures in my country

Method used

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  • A kind of nb, v composite 700mpa grade high-strength anti-seismic reinforcement steel and its production method
  • A kind of nb, v composite 700mpa grade high-strength anti-seismic reinforcement steel and its production method
  • A kind of nb, v composite 700mpa grade high-strength anti-seismic reinforcement steel and its production method

Examples

Experimental program
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Effect test

Embodiment 1

[0068] The main chemical composition and mass percentage of a 700MPa grade hot-rolled ribbed high-strength steel in this embodiment are shown in Example 1 in Table 1.

[0069] A kind of processing method of 700MPa level hot-rolled ribbed high-strength steel bar of the present embodiment comprises the following steps:

[0070] S1. Converter or electric arc furnace steelmaking, converter or electric arc furnace end point C ≥ 0.05%, P, S ≤ 0.015%, and slag blocking tapping; when tapping 1 / 4 of the steel, first add deoxidizer for deoxidation, after deoxidation is completed Add Nb iron and VN alloy, and finish adding when 3 / 4 of the steel is tapped, and the tapping temperature is 1710°C.

[0071] S2. The ladle is blown with argon for 5 minutes; the composition and temperature of the molten steel in the upper and lower parts of the ladle are uniform to ensure the uniformity and stability of the performance of the steel bar.

[0072] S3, LF furnace refining, blowing argon into the L...

Embodiment 2

[0080] The main chemical components and mass percentages of a 700MPa-grade hot-rolled ribbed high-strength steel in this embodiment are shown in Example 2 in Table 1.

[0081] A kind of processing method of 700MPa level hot-rolled ribbed high-strength steel bar of the present embodiment comprises the following steps:

[0082] S1. Converter or electric arc furnace steelmaking, converter or electric arc furnace end point C ≥ 0.05%, P, S ≤ 0.015%, and slag blocking tapping; when tapping 1 / 4 of the steel, first add deoxidizer for deoxidation, after deoxidation is completed Add Nb iron and VN alloy, and finish adding when 3 / 4 of the steel is tapped, and the tapping temperature is 1705°C.

[0083] S2. The ladle is blown with argon, and the argon blowing time is 6 minutes; the composition and temperature of the molten steel in the upper and lower parts of the ladle are uniform, so as to ensure the uniformity and stability of the performance of the steel bar.

[0084] S3, LF furnace ...

Embodiment 3

[0092] The main chemical components and mass percentages of the 700MPa grade hot-rolled ribbed high-strength steel of this embodiment are shown in Example 3 in Table 1.

[0093] A kind of processing method of 700MPa level hot-rolled ribbed high-strength steel bar of the present embodiment comprises the following steps:

[0094] S1. Converter or electric arc furnace steelmaking, converter or electric arc furnace end point C ≥ 0.05%, P, S ≤ 0.015%, and slag blocking tapping; when tapping 1 / 4 of the steel, first add deoxidizer for deoxidation, after deoxidation is completed Add Nb iron and VN alloy, and finish adding when 3 / 4 of the steel is tapped, and the tapping temperature is 1700°C.

[0095] S2. The ladle is blown with argon for 5 minutes; the composition and temperature of the molten steel in the upper and lower parts of the ladle are uniform to ensure the uniformity and stability of the performance of the steel bar.

[0096] S3, LF furnace refining, blowing argon into the...

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Abstract

The invention discloses a Nb, V composite 700MPa-grade high-strength anti-seismic reinforcement steel and a production method thereof, which belong to the technical field of hot-rolled ribbed reinforcement. Its chemical composition and mass percentage content include C: 0.25-0.35%, Si: 0.80-1.20%, Mn: 1.00-1.20%, V: 0.15-0.25%, Nb: 0.010-0.030%, Cr: 0.80-1.00% , N: 0.015~0.025%, P: ≤0.025%, S: ≤0.010%, the rest are Fe and unavoidable impurity elements; Nb, V composite microalloying, converter steelmaking (or electric arc furnace), continuous rod Rolling in steel rolling mills, under the existing technology and equipment level of steel enterprises, realizes large-scale industrial production of 700MPa high-strength seismic steel bars to meet the needs of high-rise and long-span concrete building structures in my country.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled ribbed steel bars, and more specifically relates to a Nb, V composite 700MPa grade high-strength seismic steel for steel bars and a production method thereof. Background technique [0002] Commonly known as hot-rolled ribbed steel bar is rebar, which is widely used in civil engineering construction such as houses, bridges, and roads. The technological progress of the construction industry and the proposal of the policy of reducing the amount of steel used in construction have continuously promoted the development and upgrading of new high-strength steel products in my country. In recent years, my country has introduced a series of policies to promote the application of high-strength steel bars. The percentage of high-strength steel bars used has increased year by year. At present, the percentage of 400MPa and above steel bars in the total steel bars has exceeded 90%. Compared with 400MPa-grade...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/26C22C33/06C21C7/072C21D8/08
CPCC21C7/072C21D8/065C21D8/08C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/24C22C38/26
Inventor 汪开忠郭湛吴坚杨应东于同仁赵海燕宋祖峰黄社清张步海余良其尹德福姜婷张晓瑞徐雁
Owner MAANSHAN IRON & STEEL CO LTD
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