ORALS

SESSION: IronTueAM-R2	Assis International Symposium (9th Intl. Symp. on Advanced Sustainable Iron & Steel Making)
Tue. 28 Nov. 2023 / Room: Dreams 2
Session Chairs: Tateo Usui; Marcos De Campos; Session Monitor: TBA

12:00: [IronTueAM02] OS Keynote
THE STATE-OF-THE-ART GAS CARBURIZING METHOD OF SOLID STEEL FOR MINIMIZING BOTH HYDROCARBON USE AND CO2 EMISSION BY SELECTIVE REMOVAL OF H2 FROM THE FURNACE
Tateo Usui¹ ; Tomoyuki Mizukoshi² ; Yujiro Yokoyama³ ; Hideaki Hoshino³ ; Itsuo Ishigami⁴ ; Hirokazu Konishi⁵ ; ¹Osaka University, Ibaraki, Japan; ²Seibu Metal Heat Treatment Industry Cooperative Association, Osaka, Japan; ³Izumi Center, Osaka Research Institute of Industrial Science and Technology, Izumi, Japan; ⁴Osaka Prefecrure Federation of Small Business Associations, Osaka, Japan; ⁵Osaka University, Suita, Japan;
Paper Id: 126 [Abstract]

Gas carburizing of solid steel is carried out by using a large amount of hydrocarbon in order to keep the furnace atmosphere as long as constant, because carbon from hydrocarbon is consumed for carburization of the steel surface and hydrogen remains in the furnace. In the present study, selective removal methods of H2 were surveyed and fundamental experiment was done by using Proton Conductor SrZr1-xYxO3-a , which was prepared by spark plasma sintering method; hydrogen gas was separated from wet simulated coke oven gas atmosphere at high temperature successfully. At the same time, reported method to selectively remove H2 was also applied to bench scale furnace for gas carburizing of solid steel by using gas filter module made of poli-imido fiber tube. The control of the furnace atmosphere was very important to keep it constant, which was also studied numerically as well as experimentally. Finally, selective removal of H2 from the furnace was verified experimentally and the flow rate of so-called “carrier gas” (hydrocarbons) could be reduced more than 75 % under the condition of the same quality of steel surface by the carburization treatment. As a result, exhaust gas volume could also be reduced and the burnt exhaust gas, namely, CO2 emission was minimized.

References:
[1] Yujiro Yokoyama, Tomoyuki Mizukoshi, Itsuo Ishigami and Tateo Usui: Numerical Analysis and Control of Gas Carburizing under Changes in Gas Compositions, Materials Science Forum, 522-523(2006), pp.589 - 594.
[2] Hirokazu KONISHI, Hiroshi NISHIMURA, Tateo USUI and Iwao KATAYAMA: Preparation of Proton Conductor SrZr1-xYxO3-a for Pure Hydrogen Separation in High Temperature Range (in Japanese), Journal of High Temperature Society, 34(2008)3, pp.123 - 129.
[3] Tomoyuki Mizukoshi, Yujiro Yokoyama, Hideaki Hoshino, Itsuo Ishigami and Tateo Usui: New Gas Carburizing Method for Minimizing CO2 Emission by Saving Resources and Selective Removal of H2 in Furnace (in Japanese), Journal of High Temperature Society, 35(2009)1, pp.50 - 54.
[4] Tomoyuki Mizukoshi, Hideaki Hoshino, Yujiro Yokoyama, Itsuo Ishigami and Tateo Usui: Numerical Analysis on Carbon Concentration Profiles of Gas Carburized Low Alloy Steel under Fluctuating Atmosphere, NETSU SHORI (Journal of the Japan Society for Heat Treatment), 49(2009), Special Issue, pp.319 - 322.
[5] Yujiro Yokoyama, Tomoyuki Mizukoshi, Itsuo Ishigami and Tateo Usui: Relationship between Vacuum Carburizing Conditions and Surface Carbon Concentration of SNCM815, NETSU SHORI, 49(2009), Special Issue, pp. 323 - 326.
[6] Hirokazu KONISHI, Takuya MATSUMOTO, Tateo USUI and Tomoyuki MIZUKOSHI: Characteristic of Proton Conductor Prepared by Spark Plasma Sintering in the Simulated Coke Oven Gas, Tetsu-to-Hagané (in Japanese), 96 (2010)10, pp.629 - 635.
[7] Yujiro Yokoyama, Tomoyuki Mizukoshi, Itsuo Ishigami and Tateo Usui: Development and Verification of Vacuum Carburizing Model Considering Graphite Deposition on Low Alloy Steel (in Japanese), Report of Technology Research Institute of Osaka Prefecture, No.23 (2009), pp.65 - 71.
[8] Tomoyuki Mizukoshi, Yujiro Yokoyama, Hideaki Hoshino, Itsuo Ishigami, Hirokazu Konishi and Tateo Usui: Influence of Alloying Elements on Carburizing Reaction Rate Constant of Low Alloy Steel in CO-CO2-N2 Atmosphere, Proceedings of The International Symposium on Ironmaking for Sustainable Development 2010 (ISISD 2010), (January, 2010, Osaka, Japan), pp.165 - 168, ISIJ (The Iron and Steel Institute of Japan).
[9] Hideaki Hoshino, Tomoyuki Mizukoshi, Yujiro Yokoyama, Itsuo Ishigami and Tateo Usui: Carburizing Rates of Vacuum Carburization by Acetylene Gas at 1.33 kPa, Proceedings of The International Symposium on Ironmaking for Sustainable Development 2010 (ISISD 2010), (January, 2010, Osaka, Japan), pp.169 - 172, ISIJ.
[10] Yujiro Yokoyama, Hideaki Hoshino, Tomoyuki Mizukoshi and Tateo Usui: Relationship between Vacuum Carburizing Conditions and Surface Carbon Concentration of SCM415, Proceedings of The International Symposium on Ironmaking for Sustainable Development 2010 (ISISD 2010), (January, 2010, Osaka, Japan), pp.173 - 176, ISIJ.
[11] Yujiro Yokoyama, Tomoyuki Mizukoshi, Itsuo Ishigami and Tateo Usui: Numerical Analysis and Control of Gas Carburizing under Changes in Gas Compositions, Abstracts of International Symposium on High-Temperature Oxidation and Corrosion, (November, 2005, Nara, Japan), Poster P39, ISIJ.
[12] Tomoyuki Mizukoshi, Hideaki Hoshino, Yujiro Yokoyama, Itsuo Ishigami and Tateo Usui: Numerical Analysis on Carbon Concentration Profiles of Gas Carburized Low Alloy Steel under Fluctuating Atmosphere, 17th International Federation for Heat Treatment and Surface Engineering Congress 2008 (October, 2008, Kobe, Japan), Poster P10, p.226, Japan Society for Heat Treatment.
[13] Yujiro Yokoyama, Tomoyuki Mizukoshi, Itsuo Ishigami and Tateo Usui: Relationship between Vacuum Carburizing Conditions and Surface Carbon Concentration of SNCM815, 17th International Federation for Heat Treatment and Surface Engineering Congress 2008 (October, 2008, Kobe, Japan), Poster P12, p.228, The Japan Society for Heat Treatment. [The Poster Award for 17th IFHTSE Congress 2008 (October 29, 2008)]
[14] Tomoyuki Mizukoshi, Itsuo Ishigami, Yujiro Yokoyama and Tateo Usui: For Development of Eco-friendly Carburizing Treatment Method (Part 1) - Construction and Application of Kinetics Model for Vacuum Carburizing - (in Japanese), NETSU SHORI, 50 (2010)6, pp.589 - 600.
[15] Yujiro Yokoyama, Tomoyuki Mizukoshi, Itsuo Ishigami and Tateo Usui: For Development of Eco-friendly Carburizing Treatment Method (Part 2) - Effect of Surface Graphite Deposition on Carbon Profile of Vacuum Carburized Steel - (in Japanese), NETSU SHORI, 52(2012)5, pp.257 - 262.
[16] Tomoyuki Mizukoshi, Itsuo Ishigami, Yujiro Yokoyama and Tateo Usui: For Development of Eco-friendly Carburizing Treatment Method (Part 3) - Proposal for Controlling Gas Carburizing based on Surface Reaction Rate and Diffusion of Carbon - (in Japanese), NETSU SHORI, 53(2013)6, pp.302 - 309.
[17] Tomoyuki Mizukoshi, Itsuo Ishigami, Yujiro Yokoyama and Tateo Usui: For Development of Eco-friendly Carburizing Treatment Method (Part 4) - Saving Energy and Resources in Gas Carburizing Process by Selective Removal of H2 in Furnace - (in Japanese), NETSU SHORI, 54(2014)4, pp.205 - 211.