[PSUBS-MAILIST] annealing of steel

["Brian Cox" <ojaibees@ojai.net>]

With the kittriridge sub design I know that the "hatch ring" is made of a much heavier gage steel, I believe 3/4 inch,  this is required because of the hole put in the skin of the cylinder.

 

>putting a hole in such a thin skin under tension is like putting a hole in a
balloon.       - Ellmer

 

My question is: when you order your steel cylinder ( 70 grade steel) can the hole be cut before the steel is fabricated  .  Can the annealing process be performed after the hole has been cut so as to strengthen the area around the hole.  

 

 

Brian Cox