[MW:16707] Rolling/Forming of Plug Welded Carbon Steel and Duplex Stainless steel sheets

Dear Mr. Goswami,

We need to fabricate Knife Gate Valve body with 3m - 3.6 m shells of
30 thk Carbon Steel 516 Grade 70 internally lined with Superduplex
Stainless steel sheels of 6mm thickness.

Our Fabrication contractor insists in the following procedure

1. Rolling the shells of Carbon Steel and Superduplex Stainless steel
seperately
2. Insert the shell of Superduplex SS Material into the shell of
Carbon steel material.
3. Plug Weld both the shells from the inside with 10 mm plug holes.

I would have thought that the flat sheets should be plugwelded to get
a single sheet of 36 mm thickness (30 mm SA 516 Grade 70 with 6 mm
Superduplex SS lining) and then the entire 36 mm sheet could be
rolled. However our contractor informs that there could be problems in
the strength of the plug weld and the joints could fail on Rolling.The
Customers Engineering consultant also tends to agree with the
contractor.

Please could you advise the best possible procedure to make these
lined shells of 3 m and 3.6 m diameter. I would appreciate if you
could also send me some literature / technical articles explaining how
these two materials could be joined before rolling.

Regards


Pinak Dutta

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