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High-performance bridge steel with yield strength not smaller than 500 MPa and preparation method and application of high-performance bridge steel

A technology with yield strength and high performance, applied in the field of metallurgy, can solve the problems of high preparation cost and low yield strength, and achieve the effect of low cost, simple composition design and excellent welding performance

Active Publication Date: 2022-01-21
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems of low yield strength and high preparation cost of bridge steel in the prior art, the present invention provides a high-performance bridge steel with yield strength not less than 500MPa and its preparation method and application. The prepared bridge steel meets the requirements of strength, toughness, weather resistance It has low yield strength ratio, carbon equivalent and welding sensitivity coefficient. The yield strength of the prepared bridge steel plate can reach more than 500MPa, and the low temperature impact energy at -60°C can reach more than 280J, which meets the requirements of modern bridge engineering construction. Requirements for Performance Bridge Steel Plates

Method used

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  • High-performance bridge steel with yield strength not smaller than 500 MPa and preparation method and application of high-performance bridge steel
  • High-performance bridge steel with yield strength not smaller than 500 MPa and preparation method and application of high-performance bridge steel
  • High-performance bridge steel with yield strength not smaller than 500 MPa and preparation method and application of high-performance bridge steel

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The chemical composition of the bridge steel described in this example is as follows: C: 0.05%, Si: 0.21%, Mn: 1.48%, P: 0.010%, S: 0.002%, Al: 0.03%, Cr: 0.40%, MO: 0.15%, Cu: 0.27%, Ni: 0.32%, Nb: 0.035%, Ti: 0.018%, the rest is FE and inevitable impurities. The bridge steel finished product has a thickness of 60 mm.

[0044] The preparation method of bridge steel according to the present embodiment, the feedstock is obtained by smelting, refining, alloying, calcium treatment, and finally cast into a cast blank. Specifically, the following steps:

[0045] 1) Smelting converter uses the top-bottom pressure, sufficiently decaplation, dephosphorization, endpoint carbon content 0.007%; LF for microalloy, 0.04% end-point carbon, 0.009% phosphorus content, microorin content Add to target value The RH vacuum reached 133 Pa or less, the holding time was 14 min, the purification time was 10 min, the soft blowing time was 15 min, and the sedative time was 35 min after RH treatment....

Embodiment 2

[0052] The chemical composition of bridge steel as described in this example is as follows: C: 0.05%, Si: 0.20%, Mn: 1.40%, P: 0.010%, S: 0.002%, Al: 0.03%, Cr: 0.32%, MO: 0.12%, Cu: 0.25%, Ni: 0.30%, Nb: 0.032%, Ti: 0.018%, the rest is Fe and inevitable impurities. The bridge steel finished product has a thickness of 40 mm.

[0053] The preparation method of bridge steel according to the present embodiment, the feedstock is obtained by smelting, refining, alloying, calcium treatment, and finally cast into a cast blank. Specifically, the following steps:

[0054] 1) Smelting converter uses the top-bottomed pressure, sufficiently decarbonation, dephosphorization, endpoint carbon content of 0.008%; LF for microorption, 0.04% of the endpoint carbon, 0.010% phosphorus content, microorin content Add to target value The RH vacuum reached 133 Pa or less, the pressure main pressure time was 14 min, the purification time was 9 min, the soft blow time was 13min, and the calm time was 34 min...

Embodiment 3

[0061] The chemical composition of the 8 mm high-performance bridge steel in this example is as follows: C: 0.04%, Si: 0.20%, Mn: 1.35%, P: 0.010%, S: 0.003%, Al: 0.031%, Cr: 0.30%, MO : 0.12%, Cu: 0.25%, Ni: 0.30%, Nb: 0.038%, Ti: 0.016%, the rest is FE and inevitable impurities. The bridge steel finished product has a thickness of 8 mm.

[0062] The preparation method of bridge steel according to the present embodiment, the feedstock is obtained by smelting, refining, alloying, calcium treatment, and finally cast into a cast blank. Specifically, the following steps:

[0063] 1) Smelting converter uses the top-bottom pressure, sufficiently decarburized, dephosphorized, endpoint carbon content 0.007%; LF for microorption, endpoint carbon 0.009%, phosphorus content, add to the target value The RH vacuum reached 133 Pa or less, the pressure time was 146 min, the purification time was 10 min, the soft blow time was 14 min, and the sedative time was 32 min after RH treatment.

[0064]...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to high-performance bridge steel with the yield strength not smaller than 500 MPa and a preparation method and application of the high-performance bridge steel. The bridge steel is prepared from the following components: 0.03% to 0.06% of C, 0.10% to 0.25% of Si, 1.30% to 1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.003% of S, 0.010% to 0.040% of Als, 0.25% to 0.45% of Cr, 0.05% to 0.20% of Mo, 0.20% to 0.30% of Cu, 0.25% to 0.40% of Ni, 0.030% to 0.040% of Nb, 0.010% to 0.040% of Ti and the balance Fe and impurities. According to the high-performance bridge steel with the yield strength not smaller than 500 MPa and the preparation method and application of the high-performance bridge steel, microalloying design is adopted, a TMCP technology is matched, precious elements are reduced, the structure is fine and uniform, and a prepared steel plate has high toughness, a low yield ratio, weather resistance, weldability and the anti-fatigue performance.

Description

Technical field [0001] The present invention belongs to the field of metallurgical technology, and more particularly to a yield strength of not less than 500 MPa high-performance bridge steel and its preparation method thereof. Background technique [0002] The bridge has long exposed to air, and the loss of corrosion is long-term, and the cost spent in the anti-rust is very large. The operation and maintenance cost of the steel structure has a significant economic and environmental effect; the high-performance bridge steel can meet the new requirements of my country's saving and environmental protection and sustainable development proposed by China, requiring high-performance steel on bridge construction. The voice has reached the importance of bridge steel research and development, the number of people in the bridge design and construction, will be strongly promoted on the steel structure bridge. Therefore, high-performance steel has a significant advantage over the application...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C33/04C21D8/02C21D8/00
CPCC22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C33/04C21D8/0205C21D8/0226C21D8/0263C21D8/005
Inventor 李灿明程文华金璐周兰聚胡淑娥袁蓉徐国军毕永杰胡晓英丛林李鹏芸孙毓磊张康张英杰李峰
Owner SD STEEL RIZHAO CO LTD
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