Steel for 635 MPa level high-strength hot-rolled steel bar

A steel bar and high-strength technology, which is applied in the field of hot-rolled ribbed steel bars for concrete, can solve problems such as difficulties, excessively dense construction of steel bars at beam-column joints, and fat beams and columns.

Active Publication Date: 2020-06-12
安徽吾兴新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a 635MPa-grade high-strength hot-rolled steel for steel bars, which has the advantages of excellent comprehensive performance, and solves the problems of fat beams and columns, beam-column joints and excessive density of steel bars in high-rise and long-span buildings. Difficult problems in construction

Method used

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  • Steel for 635 MPa level high-strength hot-rolled steel bar
  • Steel for 635 MPa level high-strength hot-rolled steel bar
  • Steel for 635 MPa level high-strength hot-rolled steel bar

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Embodiment 1

[0034] Another technical problem to be solved by the present invention is to provide a method for processing steel for 635MPa grade high-strength hot-rolled steel bars, comprising the following steps:

[0035] 1) Various raw material components required for steelmaking C: 0.27%, Si: 0.65%, Mn: 1.50%, P: 0.024%, S: 0.014%, Nb: 0.030%, V: 0.127%, Cr: 0.22%, N: 201ppm and the balance of Fe are put into the converter for smelting work. Under the smelting of the converter for a certain period of time and temperature, the content of the end point of the converter is C0.09%, which can effectively avoid the peroxidation of molten steel, P0.010%, S ≤0.012%, and block the slag to tap, reduce the internal return of P and S in the molten steel, and the tapping temperature is 1710°C;

[0036] 2) Pour the molten steel smelted in step 1) into the ladle and blow in argon. The ladle uses argon flow rate of 111L / min to blow argon for 5 minutes, fully mix the argon and molten steel, and then let...

Embodiment 2

[0044] Another technical problem to be solved by the present invention is to provide a method for processing steel for 635MPa grade high-strength hot-rolled steel bars, comprising the following steps:

[0045] 1) Various raw material components required for steelmaking C: 0.23%, Si: 0.75%, Mn: 1.55%, P: 0.022%, S: 0.013%, Nb: 0.035%, V: 0.112%, Cr: 0.29%, N: 189ppm and the balance of Fe are put into the converter for smelting work. Under the smelting of the converter for a certain period of time and temperature, the content of the end point of the converter is C0.08%, which can effectively avoid the peroxidation of molten steel, P0.009%, S0 .013%, and stop slag tapping, reduce the internal reversion of P and S of molten steel;

[0046] 2) Pour the molten steel smelted in step 1) into the ladle and blow in argon. The ladle is blown with argon at a flow rate of 101L / min argon for 6 minutes, and the argon and molten steel are fully mixed and stirred, and then the molten steel is ...

Embodiment 3

[0054] Another technical problem to be solved by the present invention is to provide a method for processing steel for 635MPa grade high-strength hot-rolled steel bars, comprising the following steps:

[0055] 1) Various raw material components required for steelmaking C: 0.29%, Si: 0.55%, Mn: 1.45%, P: 0.019%, S: 0.018%, Nb: 0.021%, V: 0.142%, Cr: 0.17%, N: 228ppm and the balance of Fe are put into the converter for smelting work. Under the smelting of the converter for a certain period of time and temperature, the content of the end point of the converter is C0.07%, which can effectively avoid the peroxidation of molten steel, P0.007%, S0 .013%, and stop slag tapping, reduce the internal reversion of P and S of molten steel;

[0056] 2) Pour the molten steel smelted in step 1) into the ladle and blow in argon. The ladle uses 91L / min argon gas flow rate to blow argon for 7 minutes, fully mix the argon and molten steel, and then let the molten steel stand for a while. , to re...

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Abstract

The invention relates to the technical field of hot-rolled ribbed steel bars, and discloses steel for a 635 MPa level high-strength hot-rolled steel bar. The steel is prepared from, by weight, 0.22-0.30% of C, 0.50-0.80% of Si, 1.40-1.60% of Mn, not larger than 0.025% of P, not larger than 0.025% of S, 0.015-0.035% of Nb, 0.105-0.145% of V, 0.15-0.35% of Cr, 0.018-0.025% of N and the balance Fe. According to the steel for the 635 MPa level high-strength hot-rolled steel bar and a machining method thereof, by adopting C, C is a cheap element, the strength of the steel can be remarkably improved, the extension performance of the steel can be lowered, meanwhile, the cold brittleness and aging sensitivity of the steel are improved, the integrated ingredients are reasonable, the comprehensive performance of the whole steel is improved, the stability of the steel performance is enhanced, the overall performance of the steel on the aspects of yield strength, tensile strength, the high yield ratio, the percentage elongation after fracture, the total elongation percentage under the maximum force and the like is good, meanwhile, the steel metallographic structure is ferrite+pearlite, the granularity is 11.5, the good fatigue resistance is achieved, the steel is suitable for large-scale industrial production, and benefits are remarkable.

Description

technical field [0001] The invention relates to the technical field of hot-rolled ribbed steel bars for concrete, in particular to a steel for 635MPa high-strength hot-rolled steel bars. Background technique [0002] High-strength steel bars have good comprehensive mechanical properties, high strength and good ductility. When used in concrete structures, the amount of steel used can be significantly reduced on the premise of ensuring the service life and safety performance of buildings, especially in high-rise or long-span buildings. Obviously, at present, 500MPa-grade steel bars are mostly used in concrete structures in developed countries such as Europe and the United States, and 600MPa-grade steel bars are also widely used. At present, it has reached more than 90% of the total amount of steel bars used in construction. [0003] Compared with 400MPa-grade steel bars, 635MPa-grade high-strength steel bars have higher strength and better comprehensive performance. It is imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/26C22C38/24C22C33/04C21D1/06C21D8/08
CPCC21D8/08C22C33/04C22C38/001C22C38/02C22C38/04C22C38/24C22C38/26C22C38/38
Inventor 魏滔锴
Owner 安徽吾兴新材料有限公司
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