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Wide-thick steel plate with yield strength of 460Mpa for bridge and method of manufacturing the same

A yield strength, bridge technology, applied in the field of low-alloy wide and thick plate preparation, can solve the problem of high maintenance cost of steel bridges, and achieve the effects of comprehensive performance improvement, weather resistance improvement, and tensile strength stability.

Active Publication Date: 2011-04-20
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the steel bridge has to be exposed to the air for a long time, it has to withstand corrosion and loss for a long time. The cost of anti-corrosion accounts for a large proportion of the maintenance cost of the steel bridge.

Method used

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  • Wide-thick steel plate with yield strength of 460Mpa for bridge and method of manufacturing the same
  • Wide-thick steel plate with yield strength of 460Mpa for bridge and method of manufacturing the same
  • Wide-thick steel plate with yield strength of 460Mpa for bridge and method of manufacturing the same

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Embodiment Construction

[0013] According to the chemical composition range of the present invention, it is smelted on a laboratory 200kg vacuum smelting furnace, and forged into 110mm×110mm×120mm, and the steel billet is rolled into a 20mm thick steel plate on a laboratory φ450 rolling mill. The chemical compositions of Examples 1 and 2 are shown in Table 1, the controlled rolling and controlled cooling processes of Examples 1 and 2 are shown in Table 2, and the mechanical properties of the steel plates of Examples 1 and 2 are shown in Table 3.

[0014] The chemical composition (mass fraction % of table 1 embodiment 1 and 2, all the other are Fe)

[0015]

[0016] The processing parameter of table 2 embodiment 1 and 2

[0017]

[0018] The product mechanical property of table 3 embodiment 1 and 2

[0019]

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Abstract

A heavy steel plate with 460MPa of yield strength used by bridges and a preparation method thereof belong to the technical field of low-alloy heavy plate preparation. The steel plate comprises the chemical compositions of 0.05-0.09 percent of C, 0.25-0.45 percent of Si, 1.20-1.40 percent of Mn, 0.035-0.045 percent of Nb, 0.010-0.020 percent of Ti, 0.20-0.30 percent of Cu, 0.25-0.55 percent of Cr, 0.25-0.30 percent of Ni and the rest of Fe by mass percent. The thickness of the steel plate is 10-50mm; a metallurgical structure along the cross section is a ferrite plus a bainite structure; the grain size is grade 9.5-11; and controlled rolling and controlled cooling are adopted in preparation. The invention has the advantage that the comprehensive performance of the produced steel plate is greatly improved comparing with the conventional steel plate with the same strength grade, wherein the yield strength is stabilized in 460MPa, the tensile strength is stabilized in 590Mpa, the minus 40DEG C low-temperature toughness of the steel plate reaches higher than 100J, and the welding adaptability of the steel plate is favorable.

Description

technical field [0001] The invention belongs to the technical field of preparation of low-alloy wide and thick plates, and in particular relates to a wide and thick steel plate for bridges with a yield strength of 460 Mpa and a preparation method thereof. The wide and thick steel plate has weather resistance and is prepared by controlled rolling and controlled cooling. Background technique [0002] At present, the bridge steel produced in China basically does not have weather resistance, and mainly uses coating. Because the steel bridge is exposed to the air for a long time, it has to withstand corrosion and loss for a long time, and the cost of anti-corrosion accounts for a large proportion of the later maintenance cost of the steel bridge. If weathering steel is used to build a steel bridge, measured from the cost of the entire service period, the cost of weathering steel bridges is lower than that of ordinary steel bridges. Therefore, applying weathering steels with lower...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C21D8/02C21D1/18
Inventor 王彦锋蒋海涛高彩茹吴斌顾林豪姜中行张学峰王磊刘印良王东柱麻庆申郝宁王兴旺刘相华
Owner SHOUGANG CORPORATION
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