It is sterile conjuncture on the properties of HY-80 vs. HY-100 or any other material.
Using Titanium as the hull material has some serious drawbacks.. The US experimented with this material and decided to stay with steel. Plus, the USSR had/has a much greater supply of the raw ore than the US did...
Every country that designs and builds submarines has their own philosophies on the design and construction. All boats have their strengths and weakness's.
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