400 Mpa-grade construction steel with excellent corrosion resistance and production method

Abstract

The invention discloses 400 Mpa-grade construction steel with excellent corrosion resistance and a production method, and belongs to the field of production of construction corrosion steel. The steel comprises the following components by weight percent: 0.05% to 0.3% of C, 0.2% to 0.6% of Si, 1.2% to 1.6% of Mn, 0.03% or less of P, 0.02% or less of S, 0% to 1.9% of Cr, 0.25% to 1% of Cu, 0.4% to 1% of Ni, 0.1% to 0.5% of Mo and 0.01% to 0.02% of N, and the balance being Fe. The construction steel with excellent corrosion resistance is obtained through the adoption of a vacuum smelting-low temperature rolling-controlled rolling and controlled cooling production method, optimization of selected multi-group components, and optimization of technologies. The 400 Mpa-grade construction steel has the advantages that the steel has excellent corrosion resistance, so that the steel can be utilized in concrete structures with ultrahigh strength and ultrahigh strength design requirements in severe conditions like marine environment and marshland; and the innovation point is that optimal alloy elements like chromium are optimally selected, so that the 400 Mpa-grade construction steel has excellent corrosion resistance.

Description

technical field [0001] The invention belongs to the field of corrosion-resistant steel and its production technology control, and in particular relates to a 400Mpa grade construction steel with excellent corrosion performance and a production method. Background technique [0002] Concrete and other construction steel is the most widely used steel material in my country at present. With the different uses of steel, the corrosion degree and durability of ordinary steel show obvious disadvantages. In our country, the use of ordinary construction steel in coastal areas, marine engineering, marsh engineering and other natural environments with very harsh environmental conditions has been unable to meet the requirements of its service life. The current domestic construction materials are all made of sea sand, which is rich in a large amount of chloride ions, which can erode the steel matrix for a long time in the concrete and clean soil, which can greatly reduce the service life ...

AI Technical Summary

Problems solved by technology

Mariner steel in the United States is Ni-Cu-P series, and its corrosion resistance in the seawater splash zone is double that of carbon steel. However, due to the high phosphorus content in the steel, the low temperature impact performance and weldability are poor, and it is mainly used for Non-welded results such as piles

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