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High-strength steel bar and method for controlling power strength of concrete civil defense structure through high-strength steel bars

A high-strength steel bar and dynamic strength technology, which is applied in the field of high-strength steel bars and their control of the dynamic strength of concrete civil air defense structures, can solve the problems of high cost, unstable rolling quality, and high-strength steel bars whose yield strength cannot reach 600MPa and above. Effect of improving 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 has the following chemical composition and weight percentage: C: 0.19%, Si: 0.45%, Mn: 1.25%, V: 0.19%, Ti: 0.05%, Nb: 0.015%, Cr: 0.01%, Ni: 0.01%, P: 0.009%, S: 0.003%, N: 0.001%, 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, its chemical composition and weight percent are: C: 0.22%, Si: 0.71%, Mn: 1.51%, V: 0.24%, Nb: 0.006%, Cr: 0.025%, Ni: 0.03%, Cu: 0.02%, Mo: 0.01%, P: 0.008%, S: 0.009%, N: 0.008%, 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, the temperatur...

Embodiment 3

[0035] The high-strength steel bar of this embodiment has the following chemical composition and weight percentage: C: 0.29%, Si: 0.85%, Mn: 1.75%, V: 0.14%, Ti: 0.13%, Cr: 0.07%, Ni: 0.07%, 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 relates to a high-strength steel bar. The high-strength steel bar comprises, by weight, 0.19-0.29% of C, 0.45-0.85% of Si, 1.25-1.75% of Mn, 0.08-0.28% of combined elements including V, Ti and Nb, 0.01-0.07% of Cr, 0.01-0.07% of Ni, 0-0.05% of Cu, 0-0.01% of Mo, 0.025% of P or less, 0.025% of S or less, 0.01-0.15% of N and the balance Fe and unavoidable impurities. The yield strength and tensile strength of the high-strength steel bar can be improved, the plasticity is not lowered, and the yield strength can reach 600 MPa or higher. The high-strength steel bars are applied to a civil defense structure, the power strength value of the civil defense structure is set as the product of the tensile strength value of the high-strength steel bars and the steel bar strength comprehensive adjustment coefficient, and the steel bar strength comprehensive adjustment coefficient is 1.05-1.1.

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 dynamic strength of a concrete civil air defense structure. 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 streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C22C38/48
Inventor 姚圣法
Owner TIANSHUN GROUP
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