Hadifield steel with excellent mechanical property and manufacturing method thereof

Abstract

The invention provides hadifield steel with excellent mechanical property, which comprises the following chemical components in percentage by weight: 0.3 to 1.0 percent of C, 15.0 to 30.0 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 0.1 to 0.4 percent of V or 0.02 to 0.06 percent of Ti, and the balance of Fe and inevitable impurities. The invention also provides a method for manufacturing the steel, which comprises the processes of pouring, casting, hot rolling, cooling and reeling. Without Ai and Si elements, the hadifield steel has good TWIP effect, high strength and high plasticity, which can be used for manufacturing automobile components with high strength, high plasticity and high impact absorption energy.

Description

technical field [0001] The invention relates to a steel product, in particular, the invention relates to a high manganese steel with excellent mechanical properties. Background technique [0002] At present, the development trend of the automobile industry is to reduce weight, save energy, and improve safety, and high-strength steel can meet the requirements of reducing weight and improving safety at the same time. Therefore, high-strength steel, as one of the development trends of modern automotive steel, is becoming more and more More attention is paid by automobile factories and steel factories. After years of development, the strength of high-strength steel plates currently used in the automotive industry is 340-1470MPa, and the proportion of high-strength steel plates in the total amount of steel plates in automobiles has grown from 8.2% in 1979 to more than 30% in 2000, and there is a further increase. trend. [0003] The area under the stress-strain curve of steel i...

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Problems solved by technology

[0013] It can be seen from Table 1 that a large amount of Al and Si elements are added to the high-manganese steels disclosed in the above-mentioned patent documents, which not only increases the cost of the alloy, but also easily forms Al elements during casting. 2 o 3 , blocking the nozzle, causing casting difficulties; and Si is one of the elements that seriously affect the platability of the alloy, and cannot meet the surface requirements of automotive steel

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