The Time and Heat Dependence of the Nitrogen Distribution upon Steel Alloying with Nitrided Manganese

Abstract:

In this article the time and heat dependence of the nitrogen distribution upon steel alloying of 04Cr20Ni6Mn11Mo2NVNb steel grade by the nitrided manganese of Mn85N10 grade at the holding in the air atmosphere from 2 to 30 minutes in the temperature range 1450-1550 °С was experimentally determined. It was determined that the highest degree of nitrogen transition into steel is 99% and is observed with a short holding time of 2 min (after the introduction of nitrided manganese into the steel melt) in the low-temperature region ~ 1450 °С. Further holding and / or temperature growth results in the release of nitrogen in the gaseous form, due to the thermal dissociation of the nitrogen-containing compounds contained in the melt and removal of nitrogen from the melt into the gas phase, which leads to a decrease in the degree of nitrogen transition to the steel. The key possibility for obtaining a steel of the indicated grades group with a nitrogen content of 0.45-0.6% is shown when alloying in an air atmosphere in a low-temperature region (1450-1500°C), while optimizing the holding time.

• Periodical: Materials Science Forum (Volume 946)
• Pages: 406-410
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.946.406
• Online since: February 2019
• Authors: Leonid A. Smirnov, Oleg V. Zayakin*
• Keywords: Alloying, Heat Dependence, High-Temperature Experiment, Manganese, Nitrogen, Steel, Time Dependence

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