High-temperature carburizing steel, high-temperature carburizing steel component and preparation method thereof

Abstract

The invention designs low-cost high-temperature carburizing steel for a high-temperature carburizing environment with a temperature higher than 1000 DEG C. The low-cost high-temperature carburizing steel consists of the following chemical components in percentage by weight: 0.16-0.20% of C, less than or equal to 0.04% of Si, 0.75-0.90% of Mn, 1.15-1.25% of Cr, 0.20-0.30% of Mo, 0.040-0.050% of Al,0.0120-0.0180% of N, less than or equal to 0.025% of P, 0.015-0.025% of S, less than or equal to 0.0010% of O and the balance of Fe and inevitable impurities. An Al/N ratio is controlled to be 2.0-4.0, Si content is controlled to be relatively low, and a deoxidation process in steelmaking and a stopper rod curve control process in continuous casting are combined, so that large-scale production and continuous casting can be realized, extra process treatment does not need to perform before high-temperature carburizing, a steel structure before carburizing does not need to strictly control and the process is greatly simplified. Grade of a B-class rough system, fine system impurities and Ds impurities of high-temperature carburizing steel is lower than 0.5, carburizing can be simulated for 2-6 hours at a temperature of 1000-1030 DEG C and mixed crystal is avoided. The carburizing steel can be effectively guaranteed in fatigue life after being applied to parts such as a gear.

Description

technical field [0001] The invention relates to the field of iron and steel alloys, in particular to a high-temperature carburizing steel, a high-temperature carburizing steel component and a preparation method thereof. Background technique [0002] Domestic high-temperature carburizing technology has been applied in gear parts companies. A large number of studies have shown that when the carburizing temperature is increased from the conventional 920-930°C to 950°C, the carburizing cycle can be reduced by about 30%, and when the carburizing temperature is increased to 1000°C, the carburizing cycle can be reduced by about 55%. However, when the carburizing temperature of the commonly used gear steel reaches 950°C, a small amount of coarse austenite grains appear, which easily leads to gear deformation and greatly reduces the performance of the gear; while when the carburizing temperature is 1000°C, a large number of coarse austenite grains appear. austenite grains, leading t...

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Problems solved by technology

In addition, the existing technology does not solve the problem that the nozzle of the continuous casting tundish is blocked due to high Al content, which leads to the failure of mass production

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