Twip steel with high strength and plasticity and preparation method thereof

Abstract

The invention discloses TWIP steel with high product of strength and elongation and a preparation method thereof. The TWIP steel comprises, by weight, 0.8-1.2% of C, 0.1-0.5% of Si, 14-22% of Mn, less than or equal to 0.02% of P, less than or equal to 0.03% of S, 4.0-6.0% of Al, 0.06-0.2% of Ce, 0.05-0.4% of Bi and the balance Fe and unavoidable impurities. The TWIP steel has tensile strength of more than 900MPa, an elongation percentage of more than 50% and strength and elongation product of more than 50GPa%.

Description

technical field [0001] The invention belongs to the field of steel manufacturing for automobiles, and relates to a high-strength plastic TWIP steel plate with a high-strength plastic product greater than 50 GPa% and a manufacturing method thereof. Background technique [0002] At present, the development trend of the automobile industry is energy saving, weight reduction, environmental protection and safety improvement. The use of high-strength automobile steel can meet the needs of the automobile industry for weight reduction and safety improvement. However, the formability of conventional automotive steels decreases with increasing strength, which severely limits the application of high-strength automotive steels. TWIP steel, a new generation of automotive steel, has attracted the attention of major steel companies and automobile manufacturers for its high strength, high elongation, and high strength and plasticity. [0003] CN 102011052 A discloses a method for preparing...

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Problems solved by technology

[0003] CN 102011052 A discloses a method for preparing a twin-induced plastic steel plate. The disadvantage is that the C content is too low and the Mn content is too high, resulting in high alloy cost; the casting and rolling process is easy to cause strip breakage in the industrial production process ACCIDENT

[0004] CN 101956134 A discloses a high-strength, high-plastic copper-containing high-carbon TWIP steel and its preparation process. The disadvantage is that the Cu content is too high and cracks are prone to occur in the hot rolling process; the electric furnace smelting and die-casting production methods are adopted , high production cost

[0005] CN 101649412A discloses a high-manganese steel with excellent mechanical properties and a preparation method thereof. The disadvantage is that deoxidizing elements such as Si and Al are not added to the steel, which easily leads to excessive oxygen content in the steel and reduces the quality of the steel plate

[0006] US 2010 / 0012233 A1 discloses an ultra-high-strength TWIP steel plate and its preparation method. The disadvantage is that the C content is too low. In order to ensure the TWIP effect, the Mn content will inevitably be too high, resulting in high cost of the steel plate.

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