Dehydrogenation processes for carbon steel and alloy steel

The so-called dehydrogenation process is a heat treatment process. Since the term \"heat treatment\" should be clear to you, I needn’t go into further detail about it. :lol :lol

The common practice we use is to heat to around 150 degrees with a flame for post-weld dehydrogenation.

Hydrogen removal through heat treatment requires heating in an oven for 4–6 hours within 4 hours after heat treatment, at a temperature lower than the tempering temperature.

The so-called “hydrogen removal process” generally refers to welds; usually, if stress-relief heat treatment is required after welding, it should be carried out immediately in the furnace once the welding is completed. If stress relief treatment in the furnace cannot be carried out immediately, hydrogen removal treatment should be performed on the weld right away; this is generally done at a temperature of 250–350°C for 1–2 hours. The purpose of hydrogen removal is to reduce the amount of diffused hydrogen in the weld as promptly as possible, thereby minimizing the occurrence of cold cracks in the weld; however, hydrogen removal cannot replace stress-relief heat treatment. Materials such as forgings and castings do not require special dehydrogenation treatment; if it is necessary to control the content of gases like hydrogen, degassing during steelmaking is the most effective method.

By hydrogen removal, I mean a process that must be carried out before welding after hydrogen-containing equipment has been in use for some time; it is not hydrogen removal after welding.