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High-strength weather-resistant bridge steel and preparation method thereof

A bridge steel and weather-resistant technology, applied in the field of bridge steel, can solve the problems of high one-time investment and increased alloy cost, etc., and achieve the effects of low yield ratio, excellent welding performance and good toughness

Inactive Publication Date: 2018-06-05
CENT IRON & STEEL RES INST
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Problems solved by technology

Due to the increase in alloy cost of weathering steel, the one-time investment of materials is higher than that of ordinary bridge steel of the same level

Method used

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  • High-strength weather-resistant bridge steel and preparation method thereof
  • High-strength weather-resistant bridge steel and preparation method thereof
  • High-strength weather-resistant bridge steel and preparation method thereof

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Embodiment Construction

[0020] The technical solutions of the present invention will be described in more detail below in conjunction with preferred embodiments of the present invention.

[0021] The chemical composition of the bridge steel of the present invention is C0.05-0.15%, Si≤0.1%, Mn≤0.1%, P0.015-0.03%, S≤0.005%, Ni1.3-1.7%, Cr0 .9-1.2%, the balance Fe is unavoidable impurities. The concrete chemical compositions of the bridge steel of each embodiment and the selected comparative examples are shown in Table 1.

[0022] Table 1. Chemical composition of high-strength weather-resistant bridge steel

[0023] Numbering

C

Si

mn

P

S

Ni

Cr

Nb

Al S

CE(IIW)

Ceq(JIS)

A

0.10

0.40

0.70

0.015

0.005

1.0

1.10

-

0.03

0.503

0.478

B

0.06

0.40

0.70

0.015

0.005

1.0

1.10

0.04

0.03

0.463

0.438

[0024] The above two kinds of billets are prepared by the rolling method designed in the...

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Abstract

The invention relates to high-strength weather-resistant bridge steel and a preparation method thereof and belongs to the technical field of bridge steel. The high-strength weather-resistant bridge steel contains the following chemical components in percentage by mass: 0.04%-0.10% of C, 0.1%-0.5% of Si, 0.3%-0.8% of Mn, 0.010%-0.018% of P, less than or equal to 0.005% of S, 0.9%-1.3% of Ni, 0.9%-1.3% of Cr, less than or equal to 0.05% of Nb, 0.010%-0.04% of Als and the balance of Fe and unavoidable impurities. A panel in a required specification is acquired by virtue of working procedures of primary smelting, refining, continuous casting, heating, rolling, controlled cooling and the like. The high-strength weather-resistant bridge steel has the advantages that the process is simple, fine grain tissues are prepared by virtue of controlled rolling and controlled cooling processes, and the bridge steel simultaneously has low yield ratio, high strength, good tenacity, weldability and weather resistance and excellent welding performance and meet can construction requirements on large-thickness and wide-size modern bridge structures.

Description

technical field [0001] The invention belongs to the technical field of bridge steel, in particular to a high-strength weather-resistant bridge steel and a preparation method thereof. Background technique [0002] With the rapid development of my country's economic construction, various long-span bridges across rivers and canyons have emerged as the times require, and the demand for bridge steel is increasing. With the development of large steel structure bridges towards fully welded structures and long life, the requirements for the safety and reliability of bridge structures are becoming more and more stringent. [0003] Atmospheric corrosion is one of the main forms of failure of bridge steel structures such as steel girders and bridge decks. About 20% of the accidents in which steel bridges break are caused by atmospheric corrosion. As we all know, the corrosion of bridge steel structure not only brings damage to the engineering structure, but also increases the mainten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/40C22C38/48C22C38/06C21D8/02
Inventor 肖金福王卫卫李光瀛白宇胡宵雨张江玲
Owner CENT IRON & STEEL RES INST
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