Heat treatment to eliminate cold work hardening; can this heat treatment be carried out simultaneously with the post-weld heat treatment of the equipment?
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This post was last edited by Desert Fish on 2021-8-8 at 13:29. The company currently has a piece of equipment with a diameter of 1400 and a wall thickness of 34; the material used is 16MnDR. This equipment requires overall heat treatment after welding. In accordance with the requirements of the new standard HG/T20585-2020, this cylinder section needs to undergo heat treatment to eliminate cold work hardening after it is rolled. Can this heat treatment be carried out simultaneously with the post-welding heat treatment of the equipment? Personally, I believe they should not be carried out concurrently, but there are different opinions on this issue; it depends on how people usually proceed
:handshake,
What are the reasons why it can’t be merged? If it is not executed together, then he will have to execute it twice.
1. Is it necessary to follow the HG standards? 2. It depends on whether the heat treatment process used to restore the material properties is the same as the post-weld heat treatment. If they are different, they cannot be combined
Yes, that’s what the technical specifications in the design documents require.
Heat treatment to restore material properties also requires the preparation of heat-treated test specimens from the base material.
Yes, the product test plates and the base material test plates were manufactured together
What are the consequences if heat treatment to remove cold work hardening is not carried out after the tube section is rolled? ?
The individual said that it is not recommended to carry out simultaneous treatment; eliminating cold work hardening facilitates welding at the edges of the rings. Hardening does not cause excessive restraint in the material, which could affect the crystallization of the molten metal during subsequent welding. The overall heat treatment after equipment welding is mainly aimed at eliminating the local stresses resulting from the cooling of the welds during the welding process, as the purposes are different