A production method of 590mpa grade enhanced formability hot-dip galvanized dual-phase steel

Abstract

The invention provides a production method of 590MPa-level reinforced formability hot-dip galvanized dual-phase steel, adopting C-Si-Mn-Al-Ti as the basic alloy system, and adding the traditional dual-phase steel ferrite at a lower alloy cost On the basis of martensite microstructure, a certain amount of stable retained austenite is introduced, through the TRIP effect produced by retained austenite during deformation, and the optimization of finishing rolling, continuous annealing and galvanizing processes, the mechanical properties of the product can reach: Yield strength 380‑390MPa, tensile strength 625‑640MPa, elongation 27‑29%, n value 0.16‑0.18; galvanized surface color is uniform without defects, the inhibition layer is continuous and dense, the adhesion of the zinc layer reaches level 1, and the coating It has passed the bending test of steel base and meets the forming requirements of complex parts and surface quality requirements.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a production method of 590MPa-level reinforced formability hot-dip galvanized dual-phase steel. Background technique [0002] In order to achieve light weight, energy saving and emission reduction of automobiles, and improve automobile safety, the application of advanced high-strength steel in body-in-white is increasing day by day. Among them, dual-phase steel has become the most widely used steel type in advanced high-strength steel due to its good comprehensive mechanical properties. However, the increase in the strength of the steel plate usually leads to a decrease in formability, which is difficult to meet the complex stamping structural parts of automobile design, and the traditional DP steel is difficult to form on many high-drawability parts, and it is difficult to meet the complex stamping structural parts of automobile design. TRIP steel is used It will lead to h...

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Problems solved by technology

[0003] At present, the existing technology improves the drawing performance by adding different alloy elements on the basis of the traditional dual-phase steel DP590, and clarifies the production method, processing method or manufacturing method, such as the patent with the publication number CN111172466A; or by adjusting complex process parameters To optimize the structure of dual-phase steel DP590, the complex process parameter setting is limited to trial production in the laboratory, and is not suitable for mass production in factories, such as the patent with publication number CN111549273A

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