Production method of cold-rolled weathering steel with yield strength of 310 MPa or above

Abstract

The invention relates to a production method of cold-rolled weathering steel with the yield strength of 310 MPa or above. A cold-rolled weathering steel strip product with the thickness of 0.5 mm-2.5mm is obtained through reasonable chemical component design, steelmaking smelting, a hot rolling process, an acid rolling process and continuous annealing process control, and the internal structure of a cold-rolled weathering steel finished product is ferrite, pearlite and cementite; and the mechanical property result of the cold-rolled weathering steel finished product is that the yield strengthis greater than or equal to 310 MPa, the tensile strength is greater than or equal to 450 MPa, the percentage elongation after fracture is greater than or equal to 28%, the mechanical property is stable, the molding and atmospheric corrosion resistance of the steel strip product are excellent, and the cold-rolled weathering steel finished product can be applied to related fields such as air preheater and plate heat exchanger manufacturing. According to the cold-rolled weathering steel product, the addition amount of alloy elements such as Mn, Cu, Cr and Ni is relatively small, and the performance is optimized through steelmaking, hot rolling and cold rolling processes, so that the production cost of the product is reduced.

Description

Technical field[0001]The invention belongs to the technical field of steel rolling, and specifically relates to a method for producing cold-rolled weathering steel with a yield strength of 310 MPa or more.Background technique[0002]The main reason for the damage of steel products is rust. The method to solve the problem of rust is generally to increase the corrosion margin or apply anti-rust paint. The former will cause waste of materials, and the latter will increase maintenance costs due to the need for regular maintenance recoating, and sometimes affect normal use. Another method is to use metal coating for protection, mainly hot-dip plating or spraying zinc or aluminum, but the application of metal coating also has problems such as high cost, environmental pollution, difficulty in application of large components, and difficulty in welding. .[0003]Weathering steel, also known as atmospheric corrosion resistant steel, is to improve the atmospheric corrosion resistance of steel by a...

AI Technical Summary

Problems solved by technology

The former will cause waste of materials, and the latter will increase maintenance costs due to the need for regular maintenance repainting, and sometimes affect normal use

Another method is to use metal coating for protection, mainly hot-dip or spray zinc or aluminum, but the application of metal coating also has problems such as high cost, polluting the environment, difficult application of large components, and difficult welding.

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