A kind of ultra-fine grain size thin gauge high manganese high aluminum steel and production method

Abstract

A high-manganese and high-aluminum steel with ultra-fine grain size and thin gauge, its composition and wt% are: C: 0.91~1.35%, Si: 0.21~0.53%, Mn: 8.5~16.2%, Al: 13.7~22.4% , Nb: 0.11~0.23%, V: 0.15~0.32%, P: ≤0.018%, S: ≤0.008%, N: ≤0.008%; production method: smelting and continuous casting into slab; heating the slab, descaling ; Finish rolling; Laminar cooling; Coiling; Natural cooling to room temperature; Cold rolling; Continuous annealing. The present invention fully refines the microstructure of the high-manganese and high-aluminum steel through reasonable composition and process control combined with Nb microalloying technology, and at the same time, under the joint action of strengthening methods such as precipitation strengthening of Nb and V microalloys , so that the yield strength of the high manganese and high aluminum steel is 1653~1721MPa, the tensile strength is 2035~2119MPa, the elongation is 52~62%, and the thickness is thinner; 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...

AI Technical Summary

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 description of the patent, it can be seen that the steel is also a related experiment carried out under laboratory conditions, and does not have the conditions for large-scale production, and the strength and strength and plasticity of the steel are relatively low.

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