Warping of Stainless Steel Cookware

Hi,
We manufacture 304 SS cookware.
The base of the cookware is as follows:
304 SS for pot
Aluminium for heat spreading sandwich
304 SS cap which cover the aluminium.
This setup works fine.
We are experimenting with induction stove friendly pots.
We replaced the 304 SS cap with 430 SS as 430 is a ferritic steel.
After brazing and as the pot cools the base of the pot takes on a
dome shape. I presume it is because of diff expansion rations of the
metals.
Any ideas to solve the problem? Diff steel? Different method?
Any help will be appreciated.
Regards
Basheer
Basheer Noorgat
(NB. Remove "dashes" from email)
NMC Waterless Cookware
South Africa
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