Gas generator for formation of endothermic gas, used for annealing, hardering and sintering of metals.
Koyo Thermo Systems

Koyo Thermo Systems Co., Ltd. is represented in Europe by
Crystec Technology Trading GmbH

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Endothermic Gas

Endothermic gas or endo gas is used for the thermal treatment of metals as a protective gas. It can be generated in an endothermic gas generator by burning natural gas, consisting mainly of methane or other hydrocarbons with heavy lack of oxygen. The reaction takes place at the surface of a catalyst under external heating at around 1000C. The process needs energy supply and is therefore endotherm.
        2 CH4  +  O2  →  CO  +  4 H2
Carbon monoxid and rather high amounts of hydrogen are formed. Nitrogen from the air is of course also available in larger quantities and can be further increased in order to dilute the hydrogen content. Carbon dioxid, water and unburnt hydrocarbons are included only in small amounts. Formation of soot can be avoided by selecting proper process conditions.
Hydrogen and carbon monoxide are reducing agents and avoid oxidation or corrosion of metal surfaces in a furnace. It has to be taken into account however, that carbon monoxid increases the carbon content of steel. Endothermic gas can therefore be used for surface hardening of steel by carbonisation or carburization. Carbon concentration can be increased up to the saturation level of austenite in surface close areas (around 1mm deep).
Koyo can offer endothermic gas generators for the usage in industrial furnaces. Koyo is a famous manufacturer of industrial furnace and has therefore much experience with design and adaption of gas generators.

Endothermic gas generator
Endothermic gas generator


  • Carbonisation, Carbonization, Carburization, Carburisation
  • Sintering
  • Annealing of steel with high carbon content
  • Normalizing


  • Cheap formation of shielding gas
  • Stable gas supply
  • Energy saving heating by usage of Moldatherm® heaters
  • Customized design

Further gas generators for the formation of exothermic gas and forming gas are also available.

Koyo Thermo Systems and Crystec will be pleased to engineer a cost effective system to satisfy your most demanding and exacting requirements.

Crystec Technology Trading GmbH will be pleased to further discuss details with you.
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