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High-strength shock-resistance steel bars and production method thereof

A technology of anti-seismic steel bars and steel bars, which is applied in the field of anti-seismic steel bars for construction and its preparation, which can solve the problems of large energy consumption, low strength level, and high alloy cost, and achieve the effect of simple alloy elements, low price, and high strength-to-yield ratio

Inactive Publication Date: 2011-03-23
XI LIN IRON & STEEL GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The yield strength of the currently developed anti-seismic steel bars is mainly concentrated at 500MPa level, and the strength level is low; it contains various alloying elements such as Nb and V, and the alloy cost is high; and all of them adopt controlled rolling and controlled cooling method, which is complicated in process and consumes a lot of energy.

Method used

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  • High-strength shock-resistance steel bars and production method thereof
  • High-strength shock-resistance steel bars and production method thereof
  • High-strength shock-resistance steel bars and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] First, after smelting by conventional steelmaking process, it is continuously cast into a round billet, so that the weight percentage of each component in the steel is shown in Table 1; the above-mentioned billet is heated to 1200 °C and kept for 45 minutes; the above-mentioned billet is cooled to 1000 °C Rolling is carried out at 850° C., and the rolling is completed to obtain a steel bar with a diameter of 45 mm, which is air-cooled to room temperature.

Embodiment 2

[0109] Firstly, after being smelted by conventional steelmaking process, it is continuously cast into a steel slab, so that the weight percentage of each component in the steel is shown in Table 1; the above-mentioned steel bar blank is heated to 1200°C and kept for 45min; the above-mentioned steel bar blank is cooled to 1050°C At 900°C, the steel bar blanks were rolled, and the rolling was finished at 900°C to obtain steel bars with a diameter of 40mm. The above steel bars were air-cooled to 300°C, collected and bundled, and cooled slowly.

[0110] Table 1, chemical composition (wt%) of the embodiment of the present invention

[0111]

[0112] σ is used to evaluate steel bars by using conventional measurement methods such as steel strength and tensile strength, and the measured performance parameters are shown in Table 2.

[0113] Table 2, technology, organization and performance of the embodiment of the present invention

[0114]

[0115] 1-2. Preparation of high-stre...

Embodiment 3

[0125] Firstly, after being smelted by the conventional steelmaking process, it is continuously cast into a steel bar blank, so that the weight percentage of each component in the steel is shown in Table 3; the above steel bar blank is heated to 1200°C and kept for 1 hour; then, the above steel bar blank is cooled When the temperature reaches 1050°C, the steel bar blanks are rolled, and when the temperature reaches 960°C, the rolling is completed to obtain a steel bar with a diameter of 40mm; and the above steel bars are air-cooled to 270°C--320°C, collected and bundled to cool slowly to room temperature.

[0126] In addition, there are steels with three components under the same process in this example, which are respectively recorded as Examples 1.1, 1.2, and 1.3. Embodiment performance is as shown in table 4.

[0127] Table 3, chemical composition (wt%) of the embodiment of the present invention

[0128]

[0129] Table 4, the mechanical property of the embodiment of the...

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Abstract

The invention discloses high-strength shock-resistance steel bars and a production method thereof. The yield strength of the high-strength shock-resistance steel bars is 500 to 1200MPa, wherein alloy elements are not required to be added into the high-strength shock-resistance steel bars the yield strength of which is below 600MP, and the components in the steel by the weight percentages includes 0.08 to 0.35% of C, 1.8 to 3.2% of Mn, 0.2 to 1.5% of Si, 0 to 1.0% of Cr, 0 to 0.02% of P and 0 to 0.01% of S, and a small amount of micro-alloy elements of V, Nb and the like are added if necessary. The steel bars have the complex phase tissues in the types of grain boundary allotriomorphic ferrite / granular bainite, lower bainite / martensite and the like and can obtain good strength and toughness coordination by controlling the ratio, the morphology and the distribution of each phase. In addition, the steel bars have extremely strong yield ratio, and the tensile strength allowance of the high-strength shock-resistance steel bars is higher than that of the existing high-strength steel bars by 50%.

Description

technical field [0001] The invention belongs to the technical field of alloy steel smelting and processing. Specifically, the present invention relates to an anti-seismic steel bar for construction and a preparation method thereof. Background technique [0002] It is predicted that by the end of 2010, the total consumption of construction steel in my country will be about 190 million tons, accounting for 53% of the total steel consumption, of which the consumption of threaded steel bars will be 72 million tons, accounting for 38% of construction steel; the consumption of wire rods will be 52 million tons, It accounts for 27% of the steel used in construction; the consumption of thin plates is 24 million tons, accounting for 13% of the steel used in construction, and plays an important role in the development of the national economy. The quality and safety of construction projects are more important than ever. More and more stringent codes for seismic design of engineering s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/38C21D8/08
Inventor 白秉哲
Owner XI LIN IRON & STEEL GRP
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