A kind of 550mpa grade cold-rolled corrosion-resistant dual-phase steel and its manufacturing method

Abstract

The invention discloses a 550MPa grade cold-rolled corrosion-resistant dual-phase steel and a manufacturing method thereof. The steel comprises 0.061%-0.083% of C, less than 0.10% of Si, 1.05%-1.39% of Mn, less than or equal to 0.018% of P, less than or equal to 0.006% of S, 0.015%-0.045% of Als, 0.45%-0.91% of Cr, 0.11%-0.19% of Ni, 0.27%-0.41% of Cu, 0.011%-0.029% of Nb, 0.015%-0.035% of Ti, 0.046%-0.099% of Sb, 0.034%-0.079% of Sn, 0.11%-0.19% of Mo, 0.0008%-0.0019% of B, 0.0008%-0.0030% of Ca and the balance iron and unavoidable impurities. A 135-170mm casting blank is heated to 1228-1249DEG C, the total in-furnace time is not longer than 110 min, the rough rolling temperature is higher than 1100 DEG C, the finishing rolling finishing temperature is 895 to 915 DEG C, annealing is conducted at 790 to 820 DEG C, and steel sheets is excellent in corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of high-strength cold-rolled dual-phase steel production, and in particular relates to a cold-rolled dual-phase steel with corrosion resistance used for railway vehicles, containers and the like and a manufacturing method thereof. Background technique [0002] For transportation structures, there is an urgent need for lightweight containers to increase the weight of goods that can be transported at a time, and materials such as stainless steel or aluminum alloys have been used to manufacture lightweight containers or railway vehicles and extend their life. However, due to their high production costs, their applications are limited. However, the corrosion resistance of existing cold-rolled steel sheets cannot fully meet the requirements for use. In order to meet the needs of steel plate thinning, the development of ultra-high-strength cold-rolled corrosion-resistant steel plates with a yield strength of 550M...

AI Technical Summary

Problems solved by technology

Although the strength of this invention reaches more than 700MPa, the corrosion resistance cannot meet the requirements

[0006] In the patents disclosed above, either the strength and corrosion resistance cannot meet the requirements for use, or they are not suitable for mass production

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