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Re: [PSUBS-MAILIST] annealing of steel

Annealing is a process that slightly softens steel which has been subjected to cold work (rolling). Annealing is characterized by recovery, recrystalization and grain growth. As a rule of thumb (not always) you want small grains.
 
Adam
----- Original Message -----
From: Brian Cox
To: Personal_Submersibles@psubs.org
Sent: Monday, September 29, 2003 9:03 PM
Subject: [PSUBS-MAILIST] annealing of steel

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