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Anti-seismic reinforcing steel bar and preparation method thereof

A technology of seismic reinforcement and tensile strength, applied in the field of iron and steel metallurgy, can solve the problems of continuous casting, difficult 500MPa grade reinforcement, low strength-to-yield ratio, etc., and achieves the effect of improving hardenability, improving strength performance, and saving alloy resources.

Pending Publication Date: 2022-02-08
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Through the above-mentioned beneficial effects, the present invention successfully solves the problems that the small-scale HRB600E seismic steel bar is difficult to be converted from continuous casting with 500MPa-grade steel bars, and the strength-yield ratio is low, and ensures that the small-size (10-16mm) HRB600E earthquake-resistant steel bar has a strong-yield ratio ≥ 1.25, meeting the performance requirements of seismic reinforcement

Method used

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  • Anti-seismic reinforcing steel bar and preparation method thereof

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Embodiment 1

[0048] The invention provides a small-sized HRB600E earthquake-resistant steel bar. The production includes the following processes of reblowing converter smelting, LF refining, continuous casting and rolling. in:

[0049] In the converter smelting process, silicon manganese, ferrosilicon, high chromium ferro, vanadium nitrogen alloy are added in sequence when the molten steel reaches 1 / 4, and the addition is completed when the molten steel reaches 3 / 4. The smelting process adopts high-strength supplementary blowing, and the control end point [C] is 0.14%, [P] is 0.025%, [S] is 0.011%, and the chemical composition of molten steel in this process is controlled as follows: C: 0.23%, Si: 0.68%, Mn: 1.43%, V: 0.096%, Cr: 0.22%, N: 0.0206%, P: 0.025%, S: 0.011%, Ceq: 0.53%, the rest is Fe and unavoidable impurities;

[0050] In the LF refining process: after the temperature of the ingredients is suitable, the "soft blowing" operation is carried out, and the soft blowing time is 10...

Embodiment 2

[0054] The invention provides a small-sized HRB600E earthquake-resistant steel bar. The production includes the following processes of reblowing converter smelting, LF refining, continuous casting and rolling. in:

[0055] In the converter smelting process, silicon manganese, ferrosilicon, high chromium ferro, vanadium nitrogen alloy are added in sequence when the molten steel reaches 1 / 4, and the addition is completed when the molten steel reaches 3 / 4. The smelting process adopts high-strength supplementary blowing, and the control end point [C] is 0.12%, [P] is 0.019%, [S] is 0.013%, and the chemical composition of molten steel in this process is controlled as follows: C: 0.24%, Si: 0.70%, Mn: 1.38%, V: 0.100%, Cr: 0.24%, N: 0.022%, P: 0.019%, S: 0.013%, Ceq: 0.54%, the rest is Fe and unavoidable impurities;

[0056] In the LF refining process: after the temperature of the ingredients is suitable, the "soft blowing" operation is carried out, and the soft blowing time is 11 ...

Embodiment 3

[0060] The invention provides a small-sized HRB600E earthquake-resistant steel bar. The production includes the following processes of reblowing converter smelting, LF refining, continuous casting and rolling. in:

[0061] In the converter smelting process, silicon manganese, ferrosilicon, high chromium ferro, vanadium nitrogen alloy are added in sequence when the molten steel reaches 1 / 4, and the addition is completed when the molten steel reaches 3 / 4. The smelting process adopts high-strength supplementary blowing, the control end point [C] is 0.12%, [P] is 0.020%, [S] is 0.010%, and the chemical composition of molten steel in this process is controlled as follows: C: 0.24%, Si: 0.75%, Mn: 1.40%, V: 0.103%, Cr: 0.26%, N: 0.021%, P: 0.020%, S: 0.010%, Ceq: 0.55%, the rest is Fe and unavoidable impurities;

[0062] In the LF refining process: after the temperature of the ingredients is suitable, the "soft blowing" operation is carried out, and the soft blowing time is 10 minu...

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Abstract

The invention relates to the technical field of ferrous metallurgy, in particular to an anti-seismic reinforcing steel bar and a preparation method thereof.The anti-seismic reinforcing steel bar comprises, by weight, 0.20%-0.25% of C, 0.65%-0.80% of Si, 1.35%-1.60% of Mn, 0.090%-0.110% of V, 0.20%-0.30% of Cr, larger than or equal to 0.0180% of N, smaller than or equal to 0.035% of P, smaller than or equal to 0.035% of S, smaller than or equal to 0.55% of Ceq and the balance Fe and inevitable impurities. The beneficial influence of the specification effect of the small-specification HRB600E anti-seismic steel bar on the strength performance is fully considered, the C content is properly reduced and controlled to be 0.20%-0.25%, Ceq is smaller than or equal to 0.55%, the requirements for the C content and the carbon equivalent of the 500 MPa-grade steel bar in the GB / T 1499.2-2018 standard are met, the continuous casting rejudgment of the 500 MPa-grade steel bar can be achieved on a production organization, the production efficiency is not affected, the production organization is facilitated, and waste judgment loss is reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an anti-seismic steel bar and a preparation method thereof. Background technique [0002] The latest revised and implemented standard GB / T 1499.2-2018 of "Hot Rolled Ribbed Steel Bars for Reinforced Concrete" aims to promote energy conservation and emission reduction, eliminate backward production capacity, promote the use of high-strength steel bars and material-saving technologies, and eliminate 335MPa steel bars. Added 600MPa high-strength steel bars. [0003] The 600MPa grade high-strength steel bar can significantly reduce the amount of steel used in construction on the premise of increasing the safety of the building. Compared with the currently mainly used HRB400 and HRB500, the steel consumption is saved by 44.4% and 19.5% respectively, which is conducive to promoting the "reduction of steel" in China. Quantification" to support the transformation and u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/24C21D8/08C22C33/06
CPCC22C38/02C22C38/04C22C38/38C22C38/24C21D8/08C22C33/06
Inventor 李雪峰孙庆亮梁辉徐尚富
Owner SHANDONG IRON & STEEL CO LTD
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