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A kind of steel for 635mpa high-strength hot-rolled steel bar

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

Active Publication Date: 2021-06-22
安徽吾兴新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of steel for 635mpa 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 is blown with argon at a flow rate of 111L / min for 5 minutes, and the argon and the molten steel are fully mixed...

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 for 6 minutes, and the argon and molten steel are fully mixed and stirred, and then the molten steel is left t...

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 is blown with argon at a flow rate of 91L / min for 7 minutes, and the argon and molten steel are fully mixed and stirred, and then the molten steel is left to...

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Abstract

The invention relates to the technical field of hot-rolled ribbed steel bars for concrete, and discloses a steel for 635MPa-grade high-strength hot-rolled steel bars, which comprises the following raw materials in proportions by weight: C: 0.22-0.30%, Si: 0.50-0.80% , Mn: 1.40‑1.60%, P: ≤0.025%, S: ≤0.025%, Nb: 0.015‑0.035%, V: 0.105‑0.145%, Cr: 0.15‑0.35%, N: 0.018‑0.025% and balance Fe. The 635MPa high-strength hot-rolled steel and its processing method use C, which is a cheap element, which can significantly increase the strength of the steel, but will reduce the elongation of the steel, while increasing the cold and brittle performance and aging of the steel Sensitivity, the overall composition is reasonable, which improves the overall comprehensive performance of the steel, enhances the stability of the steel performance, and makes the steel in terms of yield strength, tensile strength, strength-to-yield ratio, elongation after fracture and total elongation under maximum force, etc. The overall performance of the steel is excellent. At the same time, the metallographic structure of the steel is ferrite + pearlite, the grain size is 11.5, and it has good fatigue resistance. It is suitable for large-scale industrial production and has significant benefits.

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 Patents(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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