stress relieving carbon steel
stress relieving carbon steel
(OP)
I have a component made from Carbon steel, it is assembled from a cold formed cone welded onto 2 backing flanges with webs welded between both flanges, we would like to stress relieve this component prior to machining to prevent distortion, can anyone suggest what temperature this should be performed at and for how long, the maximum material thickness is 35 mm.
Thanks in advance
James
Thanks in advance
James





RE: stress relieving carbon steel
RE: stress relieving carbon steel
RE: stress relieving carbon steel
James
RE: stress relieving carbon steel
RE: stress relieving carbon steel
If you are in production, and If your finish machining is simple (just machining the flanges flat with bolt patterns, etc) you may not need stress relief. Have you made any parts yet to see what happens?
RE: stress relieving carbon steel
RE: stress relieving carbon steel
RE: stress relieving carbon steel
RE: stress relieving carbon steel
If you absolutely need to use gas torches, I would build a small enclosure to house the torches to keep heat it (similar to a small furnace) and keep the flame off of the component.
Air cooling is fine.
RE: stress relieving carbon steel
RE: stress relieving carbon steel
If it is a part of pressure vessel, I believe the need of stress relieving of the cone section which was cold formed per the fiber elongation may be more concerned than that of the weld joint. If the heat treatment is required and the components are exposed to corrosion cracking environments, the higher heat treatment temperature (i.e., 620-675C) is recommended.
The heat treatment by torch is not recommended because it can produce the second problems, such as 2nd residual stress or grain growth by overheating locally.
Thomas Eun