Heat-resistant steel for diesel engine variable cross-section supercharger nozzle assembly and its smelting method

Abstract

The invention belongs to the technical field of locomotive machinery manufacturing, and discloses heat resistant steel for a variable section supercharger nozzle assembly of a diesel engine. The heatresistant steel is prepared from the compositions in percentage by mass: 0.1-1% of carbon, 0.5-3% of silicon, 0.01-2% of manganese, 0.001-0.03% of phosphorus, 0.01-0.3% of sulfur, 10-21% of nickel, 15-30% of chromium, 0.5-2.5% of molybdenum, 0.01-2% of rare earth, and the balance of ferrum. According to the heat resistant steel for the variable section supercharger nozzle assembly of the diesel engine, manufactured castings have compact structure, high heat resistant temperature, oxidation resistance and corrosion resistance, and can meet the requirements of high temperature and high pressureresistance of a supercharger nozzle of the diesel engine; and the requirements on smelting equipment are not high, and the smelting process is simple.

Description

technical field [0001] The invention relates to the technical field of locomotive machinery manufacturing, in particular to a heat-resistant steel for diesel engine variable cross-section supercharger nozzle assemblies and a smelting method thereof. Background technique [0002] Turbocharging technology has been fully used in the diesel engine industry. With the continuous improvement of environmental protection requirements, the exhaust temperature of the engine is getting higher and higher, and the performance requirements for high temperature resistance and corrosion resistance are also getting higher and higher. The original ordinary heat-resistant materials It has been unable to meet the requirements of the working conditions. The components for the nozzle of the variable cross-section supercharger are the part with the worst working temperature and working conditions, and materials with higher heat resistance temperature are needed to meet the demand. Contents of the ...

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Problems solved by technology

[0002] Turbocharging technology has been fully used in the diesel engine industry. With the continuous improvement of environmental protection requirements, the exhaust temperature of the engine is getting higher and higher, and the performance requirements for high temperature resistance and corrosion resistance are also getting higher and higher. The original ordinary heat-resistant materials It has been unable to meet the requirements of the working conditions. The components for the nozzle of the variable cross-section supercharger are the parts with the worst working temperature and working conditions, and materials with higher heat resistance temperature are needed to meet the demand.

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