Hydrogen Stress Relief, also known as a Hydrogen Bake, is the process of increasing temperature to “bake” out the hydrogen from within the substrate. A hydrogen bake is most effective if done within an hour from the substrate’s introduction to the hydrogen, so it is necessary to always have a watchful eye on your components during their manufacturing and finishing processes. If not baked out fast enough, the hydrogen will subside within the component, causing Hydrogen embrittlement.
The temperature of the bake and time spent in the oven are entirely dependent on the material of the substrate, how much hydrogen is present, and the hardness of the metal. Most hydrogen is removed from the substrate within the first few hours, however some more extreme cases and other difficult present foreign materials can take up to 24 hours to fully remove.