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A kind of ti microalloyed 635mpa grade hot-rolled ribbed steel bar and its preparation method

A hot-rolled ribbed steel bar and micro-alloying technology, which is applied in the field of hot-rolled ribbed steel bars for reinforced concrete structures, can solve the problems of unfavorable popularization and use, unfavorable ductility index, and easy occurrence of no yield of steel bars

Active Publication Date: 2022-05-03
安徽吾兴新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the following disadvantages: (1) C and Cr content are too high, although the strength index can be greatly improved, but it is not conducive to the ductility index, and the steel bar is prone to no yield phenomenon and brittle fracture; (2) Mo is a precious metal and is expensive , the production cost is high, which is not conducive to popularization and use; (3) most domestic steel bar production lines do not have online tempering devices, and the production process is difficult to achieve

Method used

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  • A kind of ti microalloyed 635mpa grade hot-rolled ribbed steel bar and its preparation method
  • A kind of ti microalloyed 635mpa grade hot-rolled ribbed steel bar and its preparation method
  • A kind of ti microalloyed 635mpa grade hot-rolled ribbed steel bar and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The present embodiment provides a method for preparing a Ti microalloyed 635MPa hot-rolled ribbed steel bar, comprising the following steps:

[0034] The chemical composition of steel is by weight: 0.28% C, 0.60% Si, 1.60% Mn, 0.025% P, 0.020% S, 0.020Ti, and the rest are Fe and unavoidable impurity elements;

[0035] Converter process: End point 0.06%C, 0.018%P, 0.011%S, tapping temperature 1650℃;

[0036] LF furnace process: Oxygen content 20ppm, entering the station and blowing argon for 6 minutes, making white slag refining to remove P, S and O, adding ferro-titanium alloy, weakly blowing argon for 15 minutes before leaving the station, and leaving the station at a temperature of 1540°C;

[0037] Continuous casting process: full protection pouring, tundish temperature 1510℃, working casting speed 2.8m / min;

[0038] Steel rolling process: heating temperature 1100°C, starting rolling temperature 1000°C, rough rolling, intermediate rolling, and final rolling to produc...

Embodiment 2

[0042] The present embodiment provides a method for preparing a Ti microalloyed 635MPa hot-rolled ribbed steel bar, comprising the following steps:

[0043] The chemical composition of steel is by weight: 0.22% C, 0.80% Si, 1.40% Mn, 0.020% P, 0.015% S, 0.040Ti, and the rest are Fe and unavoidable impurity elements;

[0044] Converter process: end point 0.08%C, 0.019%P, 0.013%S, tapping temperature 1700℃;

[0045] LF furnace process: Oxygen content 18ppm, entering the station and blowing argon for 5 minutes, making white slag refining to remove P, S and O, adding ferro-titanium alloy, weakly blowing argon for 10 minutes before leaving the station, and leaving the station at a temperature of 1610°C;

[0046] Continuous casting process: full protection pouring, tundish temperature 1550℃, working casting speed 2.0m / min;

[0047] Steel rolling process: heating temperature 1200°C, starting rolling temperature 1050°C, rough rolling, intermediate rolling, and final rolling to produc...

Embodiment 3

[0050] The present embodiment provides a method for preparing a Ti microalloyed 635MPa hot-rolled ribbed steel bar, comprising the following steps:

[0051] The chemical composition of steel is by weight: 0.26%C, 0.75%Si, 1.45%Mn, 0.021%P, 0.014%S, 0.035Ti, and the rest is Fe and unavoidable impurity elements;

[0052] Converter process: End point 0.07%C, 0.018%P, 0.015%S, tapping temperature 1680℃;

[0053] LF furnace process: Oxygen content 19ppm, entering the station and blowing argon for 5 minutes, making white slag refining to remove P, S and O, adding ferro-titanium alloy, weakly blowing argon for 12 minutes before leaving the station, and leaving the station at a temperature of 1570°C;

[0054] Continuous casting process: full protection pouring, tundish temperature 1520°C, working casting speed 2.6m / min;

[0055] Steel rolling process: Heating temperature 1180°C, starting rolling temperature 1030°C, rough rolling, intermediate rolling, and final rolling to produce Φ16...

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Abstract

The invention discloses a Ti microalloyed 635MPa grade hot-rolled ribbed steel bar and a preparation method thereof, belonging to the technical field of hot-rolled ribbed steel bars for reinforced concrete structures. The chemical composition of the steel in this bar is 0.22‑0.28%C, 0.60‑0.80%Si, 1.40‑1.60%Mn, ≤0.035%P, ≤0.035%S, 0.020‑0.040Ti by weight, the rest being Fe and unavoidable impurity elements. The present invention combines Ti microalloying components with steelmaking and steel rolling processes, and the preparation process includes converter smelting, LF ladle refining, and continuous casting into 150mm 2 Steel billets are heated in a heating furnace and then rolled into steel bars by a rolling mill. Using the principle of titanium precipitation strengthening and fine grain strengthening in steel, the mechanical properties of steel are improved, and the high-strength and high-plasticity 635MPa grade is produced without reducing the ductility index. High-strength steel bar, the yield strength of the prepared steel bar is ≥635MPa, the tensile strength is ≥795MPa, and the elongation after fracture is ≥15%, which meets the needs of the market and high-rise and long-span building structures for 635MPa-grade steel bars.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled ribbed steel bars for reinforced concrete structures, and in particular relates to a 635MPa high-strength hot-rolled ribbed steel bar and a preparation method thereof. Background technique [0002] Hot-rolled ribbed steel bars are widely used in various reinforced concrete structures, and play an important role in ensuring the service life and safety of reinforced concrete buildings. At present, 400MPa grades, grades HRB400, HRB400E (E stands for seismic steel bars) are widely used in my country. Most of the steel bars used in reinforced concrete structures in developed countries such as Europe and the United States are mainly 500MPa grades, and 600MPa grades are also used in certain applications. In recent years, with the introduction of a series of policies for the promotion and application of high-strength steel bars in my country, the percentage of high-strength steel bars with a strength l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/14B22D11/11C21C7/00C21C7/06C21D6/00C21D8/06C21D9/52B21B1/16B21B37/74
CPCC22C33/06C22C38/02C22C38/04C22C38/002C22C38/14C21C7/06C21C7/0006B22D11/11C21D8/065C21D9/525C21D6/005C21D6/008B21B1/16B21B37/74C21D2211/009C21D2211/005
Inventor 魏滔锴黄华
Owner 安徽吾兴新材料有限公司
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