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Weather-resistance bridge high-strength steel plate and production method thereof

A technology of high-strength steel plate and production method, which is applied in the field of high-strength steel plate for weather-resistant bridges, can solve the problems that weather-resistant steel plate cannot meet the needs, the steel plate has high requirements, and is dependent on imports, so as to solve the problem of coarse and uneven grains and matching of strength and toughness. Good, simple manufacturing process results

Inactive Publication Date: 2010-11-03
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used high-strength steel plates for weather-resistant bridges are A709M-HPS485W and A709SL485. This kind of high-strength steel plates for weather-resistant bridges with large thickness is not produced (used) in China at present. It mainly relies on imports, and the cost is high. Or the construction process of large-scale cross-sea bridges has higher requirements for steel plates, and general weather-resistant steel plates can no longer meet the needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The high-strength steel plate for weather-resistant bridges in this embodiment is prepared from the following components in weight percentage: C 0.09%, Si0.35%, Mn 1.20%, P 0.012%, S 0.003%, Alt 0.030%, Nb 0.028% , V 0.050%, Ni0.30%, Cr 0.50%, Mo 0.04%, Cu 0.28%, Ti 0.018%, N 0.005%, and the rest are Fe and unavoidable impurities. The thickness of the steel plate in this embodiment is 90mm.

[0025] The production method of high-strength steel plate for weather-resistant bridge of the present invention is as follows:

[0026] (1) Smelting process: The molten steel containing the above elements is first smelted in an electric furnace, then sent to the LF refining furnace for refining and adjusting the composition, and fed to the Al wire. When the temperature is 1580 ° C, it is transferred to the vacuum degassing furnace (VD furnace) for vacuum treatment. Add CaSi blocks before vacuuming, the vacuum degree is not greater than 66Pa, and the vacuum is broken when the vacuu...

Embodiment 2

[0035] The high-strength steel plate for weather-resistant bridges in this embodiment is prepared from the following components in weight percentage: C 0.10%, Si0.40%, Mn 1.18%, P 0.010%, S 0.002%, Alt 0.025%, Nb 0.025% , V 0.040%, Ni 0.35%, Cr 0.55%, Mo 0.05%, Cu 0.25%, Ti 0.015%, N 0.0048%, and the rest are Fe and unavoidable impurities. The thickness of the steel plate in this embodiment is 75 mm.

[0036] The production method of weather-resistant bridge high-strength steel plate of the present invention is as follows:

[0037] (1) Smelting process: The molten steel containing the above elements is first smelted in an electric furnace, then sent to the LF refining furnace for refining and adjusting the composition, and fed with Al wire. When the temperature is 1580 ° C, the vacuum degassing furnace (VD furnace) is vacuum treated. Add CaSi blocks, the vacuum degree is not greater than 66Pa, and the vacuum is broken when the vacuum holding time is 20 minutes;

[0038] (2) ...

Embodiment 3

[0046] The high-strength steel plate for weather-resistant bridges in this example is prepared from the following components by weight percentage: C 0.11%, Si0.30%, Mn 1.1%, P 0.011%, S 0.002%, Alt 0.040%, Nb 0.037% , V 0.080%, Ni 0.25%, Cr0.45%, Mo0.08%, Cu0.33%, Ti0.022%, N 0.0045%, and the rest are Fe and unavoidable impurities. The thickness of the steel plate in this embodiment is 10 mm.

[0047] The production method of weather-resistant bridge high-strength steel plate of the present invention is as follows:

[0048] (1) Smelting process: The molten steel containing the above elements is first smelted in an electric furnace, sent to the LF refining furnace for refining and adjusting the composition, and fed with Al wires. When the temperature is 1590 ° C, it is transferred to a vacuum degassing furnace (VD furnace) for vacuum treatment. Add CaSi block before vacuum, the vacuum degree is not more than 66Pa, and break the vacuum when the vacuum holding time is 22min;

...

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Abstract

The invention discloses a weather-resistance bridge high-strength steel plate and a production method thereof. The weather-resistance bridge high-strength steel plate is prepared from the following components in percentage by weight: less than or equal to 0.11 percent of C, 0.30 to 0.50 percent of Si, 1.10 to 1.35 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.006 percent of S, 0.25 to 0.40 percent of Ni, 0.04 to 0.08 percent of V, 0.025 to 0.045 percent of Nb, 0.010 to 0.040 percent of Alt, 0.45 to 0.70 percent of Cr, 0.25 to 0.40 percent of Cu, 0.02 to 0.08 percent of Mo, 0.015 to 0.025 percent of Ti, less than or equal to 0.015 percent of N and the balance of Fe and inevitable impurities. The invention also relates to a production method of the weather-resistance bridge high-strength steel plate. The steel plate has excellent obdurability matching, high yield strength, high weather resistance and high cold-workability. The steel quality is purer, and the maximum thickness of the steel plate is up to 90 millimeters. The weather-resistance bridge high-strength steel plate is mainly used for manufacturing ocean platform and large sea-crossing bridge structural parts.

Description

technical field [0001] The invention relates to a high-strength steel plate for weather-resistant bridges, and also relates to a production method of the high-strength steel plate. Background technique [0002] The high-strength steel plate for weather-resistant bridges is a steel plate with both corrosion resistance and high strength. The thickness is generally less than 100mm. The steel plate has good formability and welding performance to meet the needs of bridge construction. At present, the commonly used high-strength steel plates for weather-resistant bridges are A709M-HPS485W and A709SL485. This kind of high-strength steel plates for weather-resistant bridges with large thickness is not produced (used) in China at present. It mainly relies on imports, and the cost is high. Or the construction process of large-scale sea-crossing bridges has high requirements for steel plates, and general weather-resistant steel plates can no longer meet the needs. Contents of the in...

Claims

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Application Information

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IPC IPC(8): C22C38/50C21C7/10C21D8/02C21D1/25
Inventor 韦明刘利香谢良法赵文忠林建农任荣宋向前何广霞张志军张东方刘生吕建会桑德广侯彩霞张彦召王飞
Owner WUYANG IRON & STEEL
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