Thin gauge high-manganese high-aluminum steel with ultra-fine grain sizes and production method

Abstract

The invention relates to thin gauge high-manganese high-aluminum steel with ultra-fine grain sizes. The thin gauge high-manganese high-aluminum steel with ultra-fine grain sizes is prepared from the components in percentage by weight: 0.91-1.35% of C, 0.21-0.53% of Si, 8.5-16.2% of Mn, 13.7-22.4% of Al, 0.11-0.23% of Nb, 0.15-0.32% of V, less than or equal to 0.018% of P, less than or equal to 0.008% of S, and less than or equal to 0.008% of N. A production method of the thin gauge high-manganese high-aluminum steel with ultra-fine grain sizes comprises the steps of smelting and continuous casting to form a blank; heating of the cast blank; scale removal; finish rolling; laminar cooling; reeling up; naturally cooling to room temperature; cold rolling; and continuous annealing. According tothe thin gauge high-manganese high-aluminum steel with ultra-fine grain sizes and the production method, a structure of the high-manganese high-aluminum steel is fully refined through reasonable composition and process control combined with Nb microalloying technology; meanwhile, under the combined action of strengthening modes such as precipitation strengthening of Nb and V microalloys, the yield strength of the high-manganese high-aluminum steel is 1653-1721 MPa, the tensile strength is 2035-2119 MPa, the elongation is 52-62%, and the thickness is thinner; and the annealing process is simpler and the annealing time is shorter.

Description

technical field [0001] The invention belongs to high-strength steel for automobiles and a production method thereof, in particular to a thin-gauge high-manganese and high-aluminum steel with an ultrafine grain size and a production method thereof. Background technique [0002] In recent years, with the sustained and rapid development of my country's automobile industry, the production and ownership of automobiles have continued to rise, which has played a positive role in promoting the development of the national economy. However, the energy consumption of automobiles also has a huge impact and pressure on the increasingly scarce energy conditions and deteriorating environmental conditions. At a time when energy saving and emission reduction are being paid more attention than ever, the automobile industry, which is a large energy consumer, undoubtedly attracts more attention. How to reduce vehicle energy consumption, in addition to measures such as small displacement and th...

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Problems solved by technology

From the above description, it can be found that it still needs to be annealed for 4~13 hours after forging, resulting in long annealing time, complicated production process, and further improvement in production process

In addition, from the descript...

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