1000 MPa-level high-strength high-plasticity aluminum-containing medium manganese steel and manufacturing method thereof

Abstract

The invention discloses 1000 MPa-level high-strength high-plasticity aluminum-containing medium manganese steel and a manufacturing method thereof. The steel comprises the following chemical components by mass percent: 0.05-0.25% of C, 0.02-0.40% of Si, 7.0-11% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, 1.50-3.50% of Al, 0.02-0.60% of Cr, smaller than or equal to 0.50% of Cu, smaller than or equal to 0.40% of Mo, smaller than or equal to 0.10% of Nb, smaller than or equal to 0.010% of N and the balance of Fe and unavoidable impurities. The manufacturing method of the steel comprises the steps of smelting, continuous casting, hot continuous rolling, cover annealing, acid pickling cold rolling, cover annealing or continuous annealing and finishing packing. The steel disclosed by the invention has high strength, excellent cold stamping forming performance and impacting energy absorption performance.

Description

technical field [0001] The invention belongs to the technical field of high-strength steel production, and specifically refers to a 1000MPa grade high-strength and high-plasticity aluminum-containing medium-manganese steel and a manufacturing method thereof. Background technique [0002] The development direction of automobiles is to reduce weight, reduce fuel consumption, reduce emissions and improve safety. In the future, steel materials for automobiles should be a new generation of steel materials with a good combination of strength and plasticity, and the weight of automobiles can be achieved through high strengthening. At the same time, High plasticity is required to improve the formability and crash safety performance of steel. The demand for high-strength plastic product (the product of tensile strength and elongation) of thin-plate steel for automobiles drives the development and application of ultra-high-strength and high-plastic steel. The first generation of high...

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Problems solved by technology

In the technical solution, the hot-rolling coiling temperature is 500-700°C, which cannot ensure that the hot-rolling room temperature structure is a full martensitic structure; the cold-rolling continuous annealing mechanical properties of the embodiment are about 0.9, which affe...

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