Ti microalloyed 635MPa-grade hot-rolled ribbed steel bar and preparation method thereof

A hot-rolled ribbed steel bar and micro-alloying technology, applied in metal rolling, heat treatment equipment, heat treatment furnace, etc., can solve the problems of high production cost, difficult production process, unfavorable ductility index, etc.

Active Publication Date: 2020-12-22
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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  • Ti microalloyed 635MPa-grade hot-rolled ribbed steel bar and preparation method thereof
  • Ti microalloyed 635MPa-grade hot-rolled ribbed steel bar and preparation method thereof
  • Ti microalloyed 635MPa-grade hot-rolled ribbed steel bar and preparation method thereof

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Experimental program
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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, and belongs to the technical field of hot-rolled ribbed steel bars for reinforced concrete structures. The steel in the steel bar comprises, by weight, 0.22-0.28% of C, 0.60-0.80% of Si, 1.40-1.60% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, 0.020-0.040 of Ti, and the balance Fe and inevitable impurity elements. The Ti microalloyed components are combined with steel making and steel rolling processes; the preparation process comprises the steps of carrying out converter smelting, carrying out LF ladle refining, carrying out continuous casting to obtain 150mm<2> steel blanks, carrying out heating by a heating furnace and carrying out rolling on the steel blanks by a rolling mill to form the steel bar; the mechanical performance of the steel is improved by using the principle of precipitation strengthening and fine grain strengthening of titanium in the steel; the 635MPa-grade high-strength steel bar with high strength and high plasticity is produced under the premise of not reducing the ductility index; and the yield strength of the prepared steel bar is greater than or equal to 635MPa, the tensile strength of the prepared steel bar is greater than or equal to 795MPa, and the elongation after fracture of the prepared steel bar is greater than or equal to 15%, and the Ti microalloyed 635MPa-grade hot-rolled ribbed steel bar satisfies the demands of markets and high-rise and long-span building structures on the 635MPa-grade steelbar.

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 Applications(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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