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Metals 2019, 9(4), 439;

Calculation of the Mixture Flow in a Low-Pressure Carburizing Process

Institute of Materials Science and Engineering, Lodz University of Technology, 1/15 Stefanowskiego Street, 90-924 Lodz, Poland
Seco/Warwick S.A., 8 Sobieskiego Street, 66-200 Świebodzin, Poland
Author to whom correspondence should be addressed.
Received: 19 March 2019 / Revised: 10 April 2019 / Accepted: 11 April 2019 / Published: 15 April 2019
(This article belongs to the Special Issue Surface Treatment Technology of Metals and Alloys)
PDF [2961 KB, uploaded 15 April 2019]


The right selection of carburizing gas flow rates in the low-pressure carburization process is a key factor in terms of its efficiency. However, a correct calculation of the amount of carburizing gas required for uniform carburization of parts, taking into account the process temperature and batch size, is still problematic. For this reason, modern carburizing processes are carried out using an excessive belaying flow of carburizing gases. In this work steel parts (16MnCr5) were carburized in a variable-flow carburizing process (960 °C) individually matched to each segment of saturation. The effect of the variable-flow on the microstructure, surface hardness, and case hardness depth was evaluated and compared to that of a control group. It was proven that the amount of the mixture used in the variable-flow carburizing process can be significantly reduced to 54% of that consumed during the regular constant-flow carburizing without affecting the properties of the hardened layer of the steel parts. View Full-Text
Keywords: carburizing mixture flow; low-pressure carburizing; vacuum carburizing carburizing mixture flow; low-pressure carburizing; vacuum carburizing

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Wołowiec-Korecka, E.; Korecki, M.; Sut, M.; Brewka, A.; Kula, P. Calculation of the Mixture Flow in a Low-Pressure Carburizing Process. Metals 2019, 9, 439.

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