Effect of quenching and tempering

[weldtek]

Is it a viable option to quench and temper an SA 387-11 plate that has a 1/8" type 347 s.s. cladding plate already attached? The backer is around 2.5" thick, and the purpose of the heat treatment would be to enhance properties of the
SA 387, without compromising the properties of the cladding. Anyone have any thoughts?

thanks,

 

[metengr]

weldtek;
You mention a cladding plate - is this a roll-formed cladding that was applied on the SA 387 Grade 11 plate? If so, I would not recommend re-heat treatment of the clad plate. My reasoning is that the linear coefficient of expansion differences between the Cr-Mo substrate and the clad plate will result in delamination of the cladding.

 

[metengr]

weldtek;
Also, if this is a weld deposited cladding on the SA 387 Grade 11 plate, do NOT perform a re-heat treatment. The reason is that you will have carbon diffusion from the higher carbon SA 387 plate into the 347 ss weld deposit, as a result of carbon diffusion during austenitizing.

The carbon depleted region or zone in the SA 387 plate will exhibit reduce strength and increased notch sensitivity. it may lead to under clad cracking in service.

 

[weldtek]

Metengr,
Thanks for your input. FYI this is an explosion bonded clad.