PWHT
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Vibin Ravikumar
Nov 20, 2022, 10:29:46 PM11/20/22
to Materials & Welding
Hi Experts,
One of our client raised questions about the riser adapter, which we refurbish on a regular basis for them. This adapter was weld repaired in 2021, and the hardness after PWHT was 197 BHN. We repaired the same adapter a few days ago, and the hardness after PWHT is 217 BHN. And these values are within the allowable range of the ASTME-10 standard. Now, the client is questioning how the hardness has increased so dramatically.
If anyone can suggest any advice or opinions on the possibilities, it would be greatly appreciated.
Thank you in advance
Vibin Ravikumar
Student
Feb 5, 2023, 10:05:30 PM2/5/23
to Materials & Welding
Rapid cooling???
Ashraf Ali
Feb 6, 2023, 4:46:13 AM2/6/23
to Materials & Welding
It is quite normal, and as long as it fits the approval standards, there is no reason to be concerned.
The altered crystal structure and the spacing between the atoms are responsible for the enhanced hardness.
The heat treatment method was undeniably successful, and it will fulfil the same standards in 2021, but what made the difference was the age of the metal and the operating circumstances it was exposed to. As a result, the atoms' responses are no longer as they were before.
The altered crystal structure and the spacing between the atoms are responsible for the enhanced hardness.
The heat treatment method was undeniably successful, and it will fulfil the same standards in 2021, but what made the difference was the age of the metal and the operating circumstances it was exposed to. As a result, the atoms' responses are no longer as they were before.
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