01-28-08, 02:19 PM
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#23
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Commodore 
Join Date: Feb 2005
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Found this in a 2003 forums post on uboat.net, but no source was given for the information (post was made by forum member "Scott" under Technologies and Operations)
Quote:
Hull Structural for the Type IXC, IXC40, IXD2, XB and XXI.
The cylindrical pressure hull had a diameter of 4400mm (14.42') and was made of 18mm (,73")
steel with inside bulb tee frames 200X11 (7.88" web depth X .43" web thickness) on 700mm (27.56")
centers. The plating is gradually reduced throughout the tapered section fore and aft to 16mm (.63"),
nd the frames are correspondingly reduced to 130 X 9 (5.12" X .35"). Frame spacing remains
unchanged in the tapered sections.
The specification for the pressure hull plating and frames calls for a tensile strength of 74,000 psi
with a yoeld point of 51,300 psi. The steel was known as No. 52; the specification for plates is
KM 9104, and for the frames is KM 9103
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