Post-weld dehydrogenation treatment of hydrogen-resistant materials
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I’m seeking advice: Is it necessary to carry out dehydrogenation treatment after welding any material that is resistant to hydrogen, or are there certain thickness requirements or other constraints? I currently have a 30mm thick Q345R(HIC) piece of material used in equipment, and I’m not sure whether dehydrogenation treatment is required. Thank you
I don’t think it’s necessary. Hope it’s useful to you
I don’t know. It depends on the thickness of the steel plate
HGT 20581-2011 Specifications for the Selection of Materials for Steel Chemical Process Vessels, 7.8.3(2)(1) Steels in hydrogen-corrosion environments......, and stress-relief heat treatment shall be carried out after welding. Content of 8.2.2 in GB150.2. Welded joints have thickness requirements.
Post-weld heat treatment is immediately applied to remove hydrogen
Finally, overall heat treatment is definitely required.
Post-weld hydrogen removal treatment is required; depending on the type and thickness of the material, the following treatments are necessary: 1. Preheating before welding followed by post-weld heating for hydrogen removal – DHT; 2. Intermediate stress relief – ISR; 3. Post-weld heat treatment – PWHT
Q345R(HIC) material is a material resistant to hydrogen sulfide stress corrosion. Different from the general concept of hydrogen-resistant steels, degassing after welding is not particularly important for this material; rather, post-weld heat treatment is necessary to relieve stresses.
Q345R(HIC) material is a material resistant to hydrogen sulfide stress corrosion. Different from the general concept of hydrogen-resistant steels, degassing after welding is not particularly important for this material; rather, post-weld heat treatment is necessary to relieve stresses.
Q345R(HIC) material is a material resistant to hydrogen sulfide stress corrosion; no degassing treatment is required for thicknesses of 30 mm, and a slightly higher preheating temperature is sufficient. Ultimately, just performing heat treatment will do
There is hydrogen loss; that’s why hydrogen corrosion prevention treatment is necessary, right?