Is heat treatment required for the welds of 20#GB9948 pipes?
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As the title suggests, after searching online I found a post by a more experienced user on a forum at http://bbs.hcbbs.com/thread-265548-1-1.html regarding hydrogen-handling pipelines; the material used there is also 20#GB9948. The replies mentioned that post-weld hydrogen removal heat treatment is required. Are there any standards governing the procedures for this type of heat treatment? Most specifications relate to the heat treatment of carbon steel with wall thicknesses greater than 19 mm. So, are there any specific regulations in GB9948 for 20# steel that require heat treatment?
I’ll give you some support, hehe... I do have some knowledge about pipeline materials, but I’m not very familiar with the actual construction process; I can only offer you some assistance.. :)
Thin-walled ones are not required; stick to the welding process for 20# steel instead
For carbon steel pipes with a diameter of 426*9, using liquid ammonia as the medium, and subject to stress corrosion caused by liquid ammonia, what heat treatment should be applied and what should be the heat treatment temperature? ? Constant temperature time? ? I checked many standards and specifications, but none provide specific regulations
Check the specifications to see which one you should use. National standard GB50235, and American standard ASME B31.3 – both are related to process pipelines. Regarding the heat treatment of carbon steel, it should be related to the wall thickness. . .