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High-strength steel bar and method for controlling minimum reinforcement ratio of concrete plate flexural member through high-strength steel bars

A technology of high-strength steel bars and concrete slabs, which is applied in the direction of building materials, etc., can solve the problems of high cost, unstable rolling quality, and the yield strength of high-strength steel bars cannot reach 600MPa and above, so as to improve the yield strength without reducing plasticity and the effect on tensile strength

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 has the following chemical composition and weight percentage: C: 0.18%, Si: 0.45%, Mn: 1.35%, V: 0.19%, Ti: 0.02%, Nb: 0.015%, Cr: 0.01%, Ni: 0.01%, P: 0.009%, S: 0.003%, N: 0.005%, 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...

Embodiment 2

[0031] The high-strength steel bar of this embodiment has the following chemical composition and weight percentage: C: 0.26%, Si: 0.71%, Mn: 1.51%, V: 0.24%, 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: 0.85%, Mn: 1.65%, V: 0.14%, Ti: 0.08%, Cr: 0.05%, Ni: 0.05%, Cu: 0.05%, Mo: 0.008%, P: 0.025%, S: 0.025%, N: 0.012%, 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 0.18-0.28% of C, 0.45-0.85% of Si, 1.35-1.65% of Mn, 0.09-0.26% of combined elements of V+Ti+Nb, 0.01-0.06% of Cr, 0.01-0.06% of Ni, 0-0.05% of Cu, 0-0.01% of Mo, 0.025% of P or less, 0.025% of S or less, 0.005-0.015% of N and the balance Fe and unavoidable impurities. The yield strength and tensile strength are improved, the plasticity is not lowered, and the yield strength can reach 600 MPa or more, so that when the high-strength steel bar is applied to a concrete plate flexural member, the minimum reinforcement ratio of the concrete plate flexural member is set as the larger value between 0.15 and 45ft / fy.

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 minimum reinforcement percentage of a concrete slab type bending member. 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 ul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C21D8/08E04C2/06
Inventor 姚圣法
Owner TIANSHUN GROUP
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