Cladded Induction Bend

[Iqbal86]

Hi
I have a customer requiring pbht on their cladded induction bend. I would like to know whether this bend required quench & temper or just stress relieved is enough?

Below is the bend details;
OD: 12inch
Thickness
X65: 12mm
Inconel: 4mm
Radius: 3D

API X65 PSL 2 + Inconel

 

[weldstan]

If you only stress relieve it may not meet X-65 anymore. You should ask the purchaser to specify the pbht to be used. I'm not sure you haven't reduced the yield strength of the X65 by the induction bend heating and cooling process. You need to do your homework by testing to determine appropriate PBHT.

 

[SJones]

What specification are they working to, ISO 24139-1 ? The service you are supplying is just the heat treatment? The PBHT should be part of the manufacturing procedure qualification, so someone should be cutting up a test bend to ascertain the properties. At the very least, the CRA will need corrosion testing after the heat treatment. If you are receiving as bent induction bends then, technically, the carbon steel will be quenched already.

 

[Iqbal86]

Hi weldstan
The customer depend on us to advice what pbht need to be performed. We will try with quench & temper for the pbht.

Hi SJones
The spec is general. ISO 15590-1. We only perform induction bending and pbht only. Customer will take back and do the testing.

Fyi, the backing pipe is quench at 920deg C and temper at 650deg C.

My concern is about the risk of disbonding at elevated temperatures. Your guidance on this would be appreciated.