Austenite valve steel and technique for producing the same

Abstract

The invention discloses austenitic valve steel and a process for producing the same. The austenitic steel comprises the following components in mass percentage: 0.57 to 0.65 percent of C, less than or equal to 0.25 percent of S, 9.50 to 11.50 percent of Mn, less than or equal to 1.50 percent of Ni, 20.00 to 22.00 percent of Cr, less than or equal to 0.050 percent of P, less than or equal to 0.030 percent of S, 0.40 to 0.60 percent of N, 1.00 to 1.20 percent of Nb, 0.75 to 1.00 percent of V, and the balance being iron and inevitable impurities. The production process is to take the component materials and adopt an electric furnace smelting method to perform quenching and tempering, gas refining and continuous casting and tandem rolling. The austenitic valve steel has the advantages of reasonable component design, good product comprehensive performance and low nickel content; besides, the production process substantially reduces the power consumption in production, and the production cost is low.

Description

technical field [0001] The invention belongs to the field of preparation of austenitic heat-resistant steel, and is particularly suitable for producing austenitic heat-resistant steel for intake and exhaust valves of internal combustion engines. Background technique [0002] Air valve steel is the main material for making engine intake and exhaust valves. It is widely used in large, medium and small engines. It is an important vulnerable part of the engine. Therefore, it is one of the urgent problems to be solved in the valve steel industry to study materials that are resistant to high temperature, wear and corrosion. At present, due to the absence of new high-temperature wear-resistant and corrosion-resistant materials in China, pure high-temperature-resistant alloy steel and simple wear-resistant materials are often used. Although the former has good high-temperature resistance, the wear-resistant and corrosion-resistant properties are not enough; the latter Although the ...

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Problems solved by technology

In addition, Germany introduced an improved valve steel in the patent document DE3704473A1, which added 5-6% Al, 1.8-2.5% Nb, 0.8-1.5% W on the basis of 21-4N steel, and N increased To the composition range of 0.4-0.6%, this steel is used in high-load exhaust valves of internal combustion engines, but the preparation cost of this steel is still more than double that of 21-4N steel