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485MPa level TMCP+ tempering weather-proof bridge steel plate and production method

A production method and technology for steel plates, applied in the field of metallurgy, can solve the problems of inability to resist atmospheric corrosion, impact toughness, poor weldability fatigue, corrosion, etc., and achieve the effect of good atmospheric corrosion resistance and improved atmospheric corrosion resistance.

Inactive Publication Date: 2016-07-20
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional high-strength bridge steel not only has poor impact toughness, weldability, and fatigue resistance, but also cannot resist atmospheric corrosion and seawater corrosion.

Method used

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  • 485MPa level TMCP+ tempering weather-proof bridge steel plate and production method
  • 485MPa level TMCP+ tempering weather-proof bridge steel plate and production method
  • 485MPa level TMCP+ tempering weather-proof bridge steel plate and production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The yield 485MPa grade TMCP + tempering type weather-resistant bridge steel plate of this embodiment has a thickness of 25mm. The weight percentage of its chemical composition is shown in Table 1, and the balance is Fe and unavoidable impurities.

[0037] The production method of the yield 485MPa grade TMCP+tempering type weather-resistant bridge steel plate of the present embodiment, the specific steps are as follows:

[0038] 1) Smelting: The molten steel is first smelted in an electric furnace, then sent to an LF refining furnace for refining, and Al wire is fed during refining. When the temperature of the molten steel reaches 1540°C, it is transferred to a VD furnace for vacuum degassing treatment. Before VD, 100kg of CaSi block is added to change the shape of inclusions;

[0039] The vacuum degree of vacuum degassing treatment is 66.6Pa, and the vacuum holding time is 20min.

[0040] 2) Continuous casting: Continuous casting slabs with a thickness of 200mm are used...

Embodiment 2

[0046] The yield 485MPa grade TMCP+tempering type weather-resistant bridge steel plate of this embodiment has a thickness of 60mm. The weight percentage of its chemical composition is shown in Table 1, and the balance is Fe and unavoidable impurities.

[0047] The production method of the yield 485MPa grade TMCP+tempering type weather-resistant bridge steel plate of the present embodiment, the specific steps are as follows:

[0048] 1) Smelting: The molten steel is smelted in an electric furnace first, then sent to the LF refining furnace for refining, and Al wire is fed during refining. The temperature of the molten steel is 1550°C and transferred to the VD furnace for vacuum degassing treatment. Before VD, add Fe-Ca wire 400m to change the shape of inclusions;

[0049] The vacuum degree of vacuum degassing treatment is 66Pa, and the vacuum holding time is 24min.

[0050] 2) Continuous casting: Continuous casting slabs with a thickness of 200mm are used, and the slabs are hea...

Embodiment 3

[0056] The yield 485MPa grade TMCP+tempering type weather-resistant bridge steel plate of this embodiment has a thickness of 60mm. The weight percentage of its chemical composition is shown in Table 1, and the balance is Fe and unavoidable impurities.

[0057] The production method of the yield 485MPa grade TMCP+tempering type weather-resistant bridge steel plate of the present embodiment, the specific steps are as follows:

[0058] 1) Smelting: The molten steel is smelted in an electric furnace first, then sent to the LF refining furnace for refining, and Al wire is fed during refining. The temperature of the molten steel is 1530°C and transferred to the VD furnace for vacuum degassing treatment. Before VD, 110kg of CaSi blocks are added to change the shape of inclusions; The vacuum degree of gas treatment is 60Pa, and the vacuum holding time is 25min.

[0059] 2) Continuous casting: Continuous casting slabs with a thickness of 200mm are used, and the slabs are heated accordi...

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Abstract

The invention discloses a 485MPa level TMCP+ tempering weather-proof bridge steel plate and a production method. The steel plate is formed by smelting following chemical components including, by weight percent, 0.05%-0.08% of C, 0.25%-0.50% of Si, 1.20%-1.40% of Mn, smaller than or equal to 0.012% of P, smaller than or equal to 0.005% of S, 0.25%-0.40% of Ni, 0.45%-0.7% of Cr, 0.25%-0.4% of Cu, 0.02%-0.08% of Mo, 0.015%-0.030% of Nb, 0.020-%-0.050% of Al, 0.040%-0.070% of V, and the balance Fe and inevitable impurities. According to the steel plate production method, molten steel is subjected to the procedures of smelting, continuous casting, heating, rolling, cooling and tempering, and then the steel plate is obtained. The large-thickness yield 485MPa level TMCP+ tempering weather-proof bridge steel plate produced through the method has the beneficial effects that the low equivalent carbon equivalent and crack sensitive indexes and the low yield ratio are achieved, the low-temperature impact strength is excellent, and the welding performance is good.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a yield 485MPa grade TMCP+tempering type weather-resistant bridge steel plate and a production method thereof. Background technique [0002] With the development of large steel structure bridges towards fully welded structures and high parameters, the requirements for the safety and reliability of bridge structures are becoming more and more stringent. This not only puts forward higher requirements for the designer, but also puts forward a higher standard for the quality of the steel plate, that is, the steel plate is not only required to have high strength to meet the requirements of lightweight structure, but also to have excellent low temperature toughness, weldability and durability. Corrosion properties, etc., to meet the requirements of safety, reliability, and long life of steel structures. [0003] Traditional high-strength bridge steel not only has poor i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/08C22C38/18C22C38/16C22C38/12C22C38/02C22C38/04C22C38/06C21D8/02
CPCC22C38/08C21D8/0226C21D8/0231C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/16C22C38/18
Inventor 邓建军张志军赵文忠韦明李杰高雅张海军徐腾飞王晓书张伟军
Owner WUYANG IRON & STEEL
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