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Anti-corrosion steel for bridge tubular pile and production method of anti-corrosion steel

A corrosion-resistant and bridge technology, applied in the field of bridge steel machine production, can solve the problems of inability to prepare steel pipe piles, segregation of rare earth oxides, and high production costs, and achieve low production costs, reduce production costs, and improve production efficiency. Effect

Active Publication Date: 2014-01-22
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After searching, the weathering steel (Cor-tenB) for 345MPa welded structure developed in the United States contains Cu, Ni, Cr, P and other corrosion-resistant alloy elements in its composition, which has high production cost and poor welding performance
[0006] The Chinese patent application number is 200610098398.2, which discloses "a production method of corrosion-resistant carbon structural steel". The yield strength level of this invention is 235MPa, which is easy to cause serious segregation of rare earth oxides, resulting in a low pass rate
[0007] The Chinese patent application number is 200610125365.2, which discloses "a production method of high-strength weather-resistant steel". Because expensive corrosion-resistant alloy elements such as Cu, Ni, Cr, and Mo are added to the steel, not only the production cost is high , more importantly, it cannot be used in the preparation of steel pipe piles

Method used

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  • Anti-corrosion steel for bridge tubular pile and production method of anti-corrosion steel
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Embodiment Construction

[0039] The present invention is described in detail below:

[0040] Table 1 is the value list of each embodiment of the present invention and comparative examples;

[0041] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0042] Table 3 is a list of various embodiments of the present invention and comparative performance detection situations;

[0043] Table 4 is a list of various embodiments of the present invention and comparative corrosion test results.

[0044] Each embodiment of the present invention is produced according to the following steps:

[0045] 1) Converter smelting and continuous casting into billets: add Re and Zr composite cored wire in the ladle according to 7.2-7.5 m / ton steel, the diameter of the composite cored wire is 10mm; and control the wire feeding speed at 160-210 m / min, the wire feeding time is 2.3~3 minutes, and argon is blown during the wire feeding process, the argon blowing time i...

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Abstract

The invention discloses anti-corrosion steel for a bridge tubular pile. The anti-corrosion steel comprises the following components in percentage by weight: 0.07-0.13% of C, 0.30-0.65% of Si, 0.80-1.30% of Mn, 0.025-0.045% of P, less than or equal to 0.002% of S, not greater than 0.006% of Al, 0.035-0.050% of V, 0.008-0.025% of Ti, 0.005-0.02% of Re, 0.006-0.012% of Zr and 15-30ppm of dissolved [O]. A production method of the anti-corrosion steel comprises the following steps: performing converter smelting and continuous casting to obtain a blank; performing stack cooling on the casting blank; heating the casting blank; performing sectional rolling; performing conventional laminar cooling; coiling; and performing air cooling to room temperature. According to the anti-corrosion steel disclosed by the invention, the yield strength is greater than or equal to 390MPa, the tensile strength is greater than or equal to 510MPa, the elongation A is greater than or equal to 21%, the impact energy Akv at 0 DEG C is greater than or equal to 47J, the corrosion resistance is equivalent to that of the American Corten B steel, the thickness specification of a steel plate is 20-25mm, the production cost is low, and the large-scale production requirement is met; moreover, a straight welding pipe is replaced to manufacture the bridge steel tubular pile, the production efficiency can be remarkably improved, and the production cost of the steel tubular pile is lowered.

Description

technical field [0001] The invention relates to a machine production method of steel for bridges, in particular to steel for corrosion-resistant bridge pipe piles and a production method thereof. Background technique [0002] Steel pipe piles for bridges (abbreviation: steel pipe piles) are mainly used in the load-bearing foundations of cross-sea bridges, and can also be used in load-bearing foundations such as high-rise buildings and ports and wharfs. They have great market demand and broad application prospects. At present, the thickness of steel used for bridge pipe piles is less than 20mm. For the manufacture of steel pipe piles with thickness specifications ≥ 20mm, the welding method is to carry out straight seam welding and girth welding of steel plates (single-rolled flat plates), which has low production efficiency and high cost. It can no longer meet the needs of development. [0003] With the construction demand of large-scale cross-sea bridges in my country, not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14
Inventor 董汉雄邹德辉熊涛董中波洪君刘文斌王世森骆海贺梁宝珠
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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