Preparation method for high-performance stamping cold-rolled and galvanized steel strip

Abstract

The invention discloses a preparation method for a high-performance stamping cold-rolled and galvanized steel strip. The preparation method is characterized in that the steel strip comprises the following chemical components in percentage by mass: 0.01-0.06% of C, 0.10-0.50% of Mn, less than or equal to 0.020% of S, less than or equal to 0.025% of P, less than or equal to 0.05% of Si, greater than or equal to 0.020% of Als, greater than or equal to 0.0040% of N, and the balance of Fe and impurities within a permissible range. The method comprises a holt rolling process, a cold rolling process and a galvanizing process, wherein in the hot rolling process, a heating temperature of steel billet is 1100-1200 DEG C, the heat preservation is carried out for 1-2 hours, and a final-rolling temperature is 890-910 DEG C; a cooling mode adopts a front-stage cooling mode, and a rolling temperature is 670-700 DEG C; in the galvanizing process, the heating temperature of the strip steel is 760-830 DEG C, the soaking temperature is 760-810 DEG C, an annealing cooling rate is greater than or equal to 20 DEG C / s, and the strip steel is added into a zinc pot when being cooled to 460-490 DEG C; and during cooling after plating, overaging time of the strip steel is guaranteed to be greater than or equal to 50s. According to the preparation method disclosed by the invention, the stamping surface and the applicability in various purposes of a product are greatly improved; and the product is guaranteed to be prevented from stamping problems such as transverse grains and the like in a processing and forming process.

Description

technical field

[0001] The invention relates to a preparation method of a galvanized steel strip, in particular to a preparation method of a high-performance stamping grade cold-rolled galvanized steel strip. Background technique

[0002] With the development of the steel industry, the automobile, home appliance, construction and other machinery manufacturing industries have also developed rapidly, and the consumption of stamping-grade galvanized products is also increasing. Due to the certain deformation of stamping parts for automobiles, outer panels of home appliances and door industry, galvanized products are required to have good stamping performance while having good corrosion resistance.

[0003] If the performance of stamping grade galvanized products is not suitable, horizontal stripes and processing wrinkles will often appear during the processing and forming process. It will have a great impact on the next process and even cause waste.

[0004] According to past...