Method of producing for self-generating carbide particle reinforced ferrite heat-resistant steel

Abstract

The invention relates to in-situ carbide particle strengthening ferrite heat-resistant steel used in a sintering machine cage bar and a manufacturing method thereof, wherein the heat-resistant steel contains 0.6-1.2 percent of C, 1.0-1.5 percent of Si, 0.5-1.0 percent of Mn, 18-26 percent of Cr, 0.2-1.0 percent of Mo, 0.05-0.15 percent of Re, 0.05-0.2 percent of Al, less than 0.03 percent of S, less than 0.05 percent of P, 0.5-3 percent of more than one of Ti, V and Nb by weight percent, and the rest parts are iron and inevitable impurities. The manufacturing method comprises the following steps of: melting the raw materials for manufacturing ferrite heat-resistant steel matrix alloy in an induction furnace, heating up the molten steel to higher than 1520 DEG C, removing slag, deoxidizing,overheating to 1540-1560 DEG C, tapping and carrying out compounding treatment. The invention which remarkably improves the performance of the heat-resistant steel and prolongs the service life of the sintering machine cage bar has the advantages of simple manufacturing method, easy industrial production and lower production cost.

Description

technical field [0001] The invention relates to an authigenic carbide particle-reinforced ferrite heat-resistant steel used for a sintering machine grate bar and a manufacturing method thereof, belonging to the technical field of metallurgy. Background technique [0002] The sintering machine is the key equipment of iron and steel metallurgy, and the grate bar is the key wearing part of the sintering machine. Its working temperature changes periodically in the range of 100-1000°C; during the high-temperature sintering process, it bears the gravity of sintered ore, the high-speed impact and wear of the two airflows of powder gas, and the oxidation and corrosion of carbon monoxide, carbon dioxide, sulfur dioxide and water vapor in the atmosphere. ; During the unloading process, it bears the mechanical wear of the sinter; in addition, there are mechanical vibrations during the operation, mechanical impact during the cleaning process, etc. The combined effect of high temperatur...

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Problems solved by technology

[0006] (1) Ordinary cast iron: low cost, poor overall performance, and is rarely used at present

(2) Heat-resistant cast iron: high brittleness, poor oxidation resistance, short service life, rarely used at present

(3) High chromium cast iron: good high temperature oxidation resistance, high hardness, good wear resistance, small thermal expansion coefficient, strong deformation resistance, but poor toughness

(4) Austenitic heat-resistant steel: good high-temperature oxidation resistance and high-temperature strength, high plasticity and toughness, but large expansion coefficient, poor deformation resistance and wear resistance, and high cost

(5) Ferritic heat-resistant steel: small expansion coefficient, good deformation resistance and oxidation resistance, but its high temperature performance still needs to be improved

[0007] With the improvement of sinter output and quality requirements, the increase of sinter thickness, the extension of sintering temperature and time, the properties of grate materials, especially high temperature oxidation resistance, high temperature strength, high temperature wear resistance and thermal fatigue resistance, etc. higher requirements, traditional materials have been difficult to meet the requirements

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