Endothermic gas generators
Carbon steels preferably use endothermic atmospheres. The less expensive exogas is used in case of wires, strips, and sheets with low carbon content.
Exogas is obtained by the partial combustion of hydrocarbons.
Cracked ammonia has almost the same applications as pure hydrogen, but it is less expensive and it is used with poor carbon steel and stainless parts.
The dryers allow an almost complete absence of moisture in rich hydrogen atmospheres, using molecular sieves in regenerating adsorption columns.