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High-strength steel bar and method for controlling width of crack of concrete structural component through high-strength steel bar

A technology of concrete structure and high-strength steel bar, which is applied in the field of high-strength steel bar and its control of the crack width of concrete structural members, can solve the problems of unstable rolling quality, high cost, and the yield strength of high-strength steel bars cannot reach 600MPa and above, and achieve Improve yield strength and tensile strength without reducing plasticity

Inactive Publication Date: 2015-11-25
TIANSHUN GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of secondary remelting is high. Due to the addition of alloy elements, after remelting, molten steel contains a large amount of alloys, and the rolling quality of secondary use is unstable.
[0008] The yield strength of the above existing high-strength steel bars cannot reach 600MPa and above

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The high-strength steel bar of this embodiment, its chemical composition and weight percent are: C: 0.2%, Si: 0.51%, Mn: 1.42%, V: 0.19%, Ti: 0.03%, Nb: 0.014%, Cr: 0.01%, Ni: 0.01%, Cu: 0.01%, P: 0.009%, S: 0.003%, N: 0.008%, and the balance is Fe and unavoidable impurities.

[0028]The production process of high-strength steel bars in this embodiment is: converter smelting, LF refining, billet continuous casting, bar rolling and cooling bed cooling; wherein, converter smelting, LF refining and billet continuous casting are all existing processes , billet continuous casting adopts the process technology of clean steel and defect-free continuous casting billet, alloy composition and nitrogen content in steel and precise control, continuous casting billet with excellent internal and surface quality of continuous casting billet; among them, bar rolling In the rolling process, the rolling speed is 11.0m / s, the temperature in the heating section is 1100°C, the temperature i...

Embodiment 2

[0031] The high-strength steel bar of this embodiment has the following chemical composition and weight percentage: C: 0.22%, Si: 0.71%, Mn: 1.51%, V: 0.22%, Nb: 0.009%, Cr: 0.025%, Ni: 0.03%, Cu: 0.02%, Mo: 0.01%, P: 0.008%, S: 0.009%, N: 0.009%, and the balance is Fe and unavoidable impurities.

[0032] The production process of high-strength steel bars in this embodiment is: converter smelting, LF refining, billet continuous casting, bar rolling and cooling bed cooling; wherein, converter smelting, LF refining and billet continuous casting are all existing processes , billet continuous casting adopts the process technology of clean steel and defect-free continuous casting billet, alloy composition and nitrogen content in steel and precise control, continuous casting billet with excellent internal and surface quality of continuous casting billet; among them, bar rolling In the rolling process, the rolling speed is 15.0m / s, the temperature of the heating section is 1050°C, th...

Embodiment 3

[0035] The high-strength steel bar of this embodiment has the following chemical composition and weight percentage: C: 0.28%, Si: 0.78%, Mn: 1.6%, V: 0.14%, Ti: 0.027%, Cr: 0.05%, Ni: 0.05%, Cu: 0.05%, Mo: 0.008%, P: 0.025%, S: 0.025%, N: 0.015%, and the balance is Fe and unavoidable impurities.

[0036] The production process flow of the high-strength steel bar of this embodiment is: converter smelting, LF refining, billet continuous casting, bar rolling and cooling bed cooling; wherein, converter smelting, LF refining and billet continuous casting are all existing Process, billet continuous casting adopts clean steel and defect-free continuous casting billet technology, alloy composition and nitrogen content in steel and precise control, continuous casting billet with excellent internal and surface quality of continuous casting billet; of which rod In the rolling process, the rolling speed is 18.0m / s, the temperature in the heating section is 1150°C, the temperature in the s...

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Abstract

The invention discloses a high-strength steel bar. The high-strength steel bar comprises, by weight, 0.2-0.28% of C, 0.5-0.8% of Si, 1.4-1.6% of Mn, 0.1-0.25% of a composite component of V, Ti and Nb, 0.01-0.05% of Cr, 0.01-0.05% of Ni, 0.01-0.05% of Cu, 0-0.01% of Mo, smaller than or equal to 0.025% of P, smaller than or equal to 0.025% of S, 0.008-0.015% of N, and the balance Fe and inevitable impurities. The composite component of V, Ti and Nb is the composition of V and at least one of Ti and Nb. According to the high-strength steel bar, the yield strength and the tensile strength can be improved while plasticity is not reduced. The yield strength can reach the level of 600 MPa or more, and when the high-strength steel bar is used in a concrete structural component under the one-grade environment, the maximum crack width limit value of the high-strength steel bar can be more than 0.3 mm.

Description

technical field [0001] The invention relates to a steel bar and a production process thereof, in particular to a high-strength steel bar and a method for controlling the crack width of concrete structural members. Background technique [0002] High-strength steel bars refer to steel for reinforced concrete and prestressed reinforced concrete, whose cross-section is circular, sometimes square with rounded corners. Including plain round bars, ribbed bars, twisted bars. In the prior art, steel bars are classified into grade I reinforcement (grade 235 / 370) according to mechanical properties; grade II reinforcement (grade 335 / 510); grade III reinforcement (370 / 570) and grade IV reinforcement (540 / 835). The latter two types of steel bars are high-strength steel bars. [0003] Common types of high-strength steel bars are as follows: [0004] (1) Micro-alloyed hot-rolled ribbed steel bar: hot-rolled ribbed steel bar with improved yield strength and ultimate strength by adding van...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C21D8/08
Inventor 姚圣法
Owner TIANSHUN GROUP
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