Hi all, May I know what is the m 1

[aida2011]

Hi all,

May I know what is the maximum thickness that a plate can be cold rolled?

Thanks

Aida Hannah

 

[metengr]

It depends on the power capability of the rolling machine.

 

[EdStainless]

And the width.


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P.E. Metallurgy, Plymouth Tube

 

[MFJewell]

4 inches is the most I have seen for an HP HRSG drum.

 

[aida2011]

Mr Metengr

Thanks for your input.

If you said it depends on the capability of the rolling machine, would the force be large enough to cause the plate to crack in a short time, that you need to do many stages process annealing to prevent this from happening? This would be too time consuming and costly.

Mr. MFJewel yes I have seen a 4-in thick drum for a 165 bar steam boiler. I think the plate is cold rolled. A friend of mine said the maximum allowable thickness that can be colled rolled (for pressure vessel) is 8 inches, but he cannot backup his claim.

Aida Hannah

 

[dhengr]

Aida2011:
I doubt that there is anyone cold rolling 8" thick plate for PV’s. It is a question of the size, roll diameters and the power of the rolling machine. But, irrespective of that, there is some limit to the amount of elastic stretch the outer fibers of a thick plate can tolerate without starting to crack and the like. And, the thicker the plate, the more stretching (strain, then strain and work hardening) occurs out at the outer fibers to achieve the yielding needed near the neutral axis of the plate, to achieve the final rolled shape. I suspect most people are hot rolling plate much over 4 or 5" thick.