Corrosion-resistant high-strength light steel and preparation method

Abstract

The invention discloses corrosion-resistant high-strength light steel and a preparation method, and belongs to the technical field of alloy steel. The steel comprises the following chemical components of, in percentage by weight, 1.4wt%-1.7wt% of C, 25wt%-30wt% of Mn, 10wt%-12wt% of Al, 3wt%-5wt% of Cr, 0.05wt%-0.1wt% of Nb, less than or equal to 0.003wt% of S, less than or equal to 0.003wt% of P and the balance Fe and inevitable impurities. The preparation method comprises the following steps that a vacuum induction furnace is adopted for smelting, a cast ingot is manufactured through casting, and the cast ingot is homogenized for 10 hours-15 hours at the high temperature of 1100 DEG C-1200 DEG C; the cast ingot is subjected to homogenization treatment and then forged into a square billet; the forging stock is heated to 1180 DEG C-1200 DEG C, and the temperature is maintained for 2 hours-4 hours; 5 passes-8 passes of hot rolling are conducted on the homogenized forging stock, the forging stock is water-cooled to the room temperature, and the corrosion-resistant high-strength light steel is obtained; and the density of the steel is smaller than 6.5 g/cm < 3 >, the yield strength is 1000 MPa-1200 MPa, the tensile strength is 1100 MPa-1300 MPa, the ductility is larger than 20%, and the steel has corrosion resistance superior to that of common steel and has wide application potential in the fields of automobiles, ships, hydropower, wind power and the like.

Description

technical field [0001] The invention belongs to the field of metal materials and metallurgy, in particular to a preparation method of corrosion-resistant, high-strength and light-weight steel. Background technique [0002] The design idea of ​​the Fe-Mn-Al-C series low-density steel is to reduce the density of the steel by adding the content of Al elements, and optimize the composition by adding elements such as Mn and C, and match the corresponding preparation process to obtain low-density steel for special purposes. density steel. Saving energy and reducing consumption is a serious survival problem faced by human beings. According to the requirements of the sustainable development strategy, the lightweight of automobiles and marine engineering equipment is the future development trend. [0003] After searching the literature of the prior art, it is found that the Chinese invention patent CN109735691A discloses a 1000MPa high-carbon high-manganese low-density steel and it...

AI Technical Summary

Problems solved by technology

Due to the addition of a large amount of microalloying element Ti, the grains are refined and a large amount of TiC is precipitated, and the mechanical properties are improved. However, its production process needs to go through finish rolling at 473-682°C and crimping at 551-651°C, which has a negative impact on the performance of the rolling mill. Higher requirements and more complicated process

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