The document below which provides a comprehensive summary of some nuclear and conventional submarine pressure hull steel (and some Titanium) strengths. This is for at least 11 major submarine producing countries. The document is attributed to a vast number of open sources.
The higher the yield (stronger) the steel alloy or Titanium alloy in a submarines pressure hull the deeper it can dive in operations. As well as alloy strength other factors also influence diving depth including:
- supports for the the pressure hull
- compartments or multiple pressure hulls, and
- strength of the welds used to join sections of the pressure hull.
It is not possible to verify the accuracy of most of the figures. Commenters who know more are invited to supply corrections.
Please connect with Submarine Matters "Previous Use of Titanium in Russian Submarines" July 14, 2015 http://gentleseas.blogspot.com.au/2015/07/previous-use-of-titanium-in-russian.html.
Summary of Chinese and Russian High Tensile Alloys Pressure Hulls by Submarine Class
Below are some of the details for China and Russia. Many more details are in the Document text.
- The Japanese NS measure (kgf/mm2) to US (ksi = 1,000 psi) and vice versa http://www.endmemo.com/sconvert/kgf_mm2ksi.php
- psi x 1000 = HY converted to MPa and vice versa http://www.convertunits.com/from/psi/to/MPa .
Chinese Submarine pressure hulls
Type 039 "Song" class SSK (13 active) and possibly Type 039A "Yuan" class SSK (13 active, 7 building) 921A steel: strength 590MPa = NS60 = HY86
Chinese GJB944-90 Titanium alloy (TA5-A) strength 588MPa = NS60 = HY85 seems to be the equivalent to Russian 48-OT3 Titanium alloy.
[There is an interesting reference on Chinese Titanium alloy research for pressure hulls. The reference is “Research progress in titanium alloys for naval ships in China” by YANG Ying-li, et al., The Chinese Journal of Nonferrous Metals, 2010, vol. 20, special 1, pages 1002 to 1006. http://www.ysxbcn.com/down/upfile/soft/20101012/215-p1002-6-033.pdf
1987-2009 Independent innovation stage: Various Titanium alloys developed including Ti80.
2008-present Industrial research and promotion stage.
Akula class SSGN-SSN commissioned 1991 onwards, ten still active , may use AK-33 steel alloy = 979MPa = NS100 = HY142
Yasen-Severodvinsk class SSGN (or SSN) one commissioned 2013, four being built, may also used a low magnetic steel alloy - perhaps a development of AK-33. See Russian website.