Ultra-high-strength hot dip galvanizing complex-phase steel and production method thereof

Abstract

The invention relates to an ultra-high-strength hot dip galvanizing complex-phase steel and a production method thereof, and belongs to the technical field of complex-phase steel metallurgy. The hot-dip zinc complex-phase steel comprises the chemical components of 0.09%-0.16% of C, 0.20%-0.50% of Si, 1.70%-2. 50% of Mn, equal to or less than 0.025% of P, equal to or less than 0.005% of S, 0.20%-0.60% of Mo, 0.02%-0.08% of Al, 0.010%-0.070% of Nb, 0.030%-0.070% of Ti, and equal to or less than 0.006% of N. The preparation method comprises steps of smelting, hot rolling, acid pickling and hot dip galvanizing annealing process, wherein a pre-oxidation reduction process is adopted in the hot dip galvanizing annealing. The forming performance, welding performance and galvanizing performance ofthe prepared hot dip galvanizing complex-phase steel are good, which reaches the requirements of high strength and high elongation.

Description

technical field

[0001] The invention belongs to the technical field of multi-phase steel metallurgy, and in particular relates to an ultra-high-strength hot-dip galvanized multi-phase steel and a production method thereof. Background technique

[0002] With the development of automobile lightweight technology, it has become an inevitable trend for automobile steel to develop towards high-strength steel. Composite steel has the characteristics of high tensile strength and excellent plasticity, and has become the preferred high-strength steel for automobiles.

[0003] Patent (CN109023106A) discloses a cold-rolled hot-dip galvanized multi-phase steel and its preparation method. The weight percentages of its chemical components are: C: 0.08-0.12%, Si: 0.3-0.6%, Mn: 2.0-2.5%, P: ≤0.02%, S: ≤0.015%, Al: 0.1~0.4%, Cr: 0.2~0.5%, Mo: 0.1~0.4%, Nb: 0.03~0.06%, Ti: 0.03~0.06%, B: 0.002 ~0.003%, the balance is Fe and unavoidable impurities. Although hot-dip galvanized multiphase stee...

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