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

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 0.08percent 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 sheet for weather-resistant bridges, and also to a production method of the high-strength steel sheet. 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 below 100mm. For some offshore platforms and large-scale river-crossing and sea-crossing bridges, a certain thickness is required, and this type of Steel plates have 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 use A709M-HPS485W and A709SL485. Such large-thickness high-strength steel plates for weather-resistant bridges are not currently produced (used) in China. They mainly rely on imports and have high costs. They are also used in actual offshore platforms. Or the construction process of large-scale cros...

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