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The use of the U-boat steel (HY-100 steel alloy) for watch cases can be seen a bit of overengineering actually
A (somehow) valid point but the reasoning for Konrad has/had nothing to do with “overengineering“. When Konrad in 2016 decided to switch from ice-hardened martensitic to austenitic submarine steel for some models (DS30, DSub) the decision was based on submarine steel properties. Submarine steel, be it 1.3813 (X 40 Mn Cr N 19) or 1.3952 (X 2 Cr Ni Mo N 18-14-3) or whatever steel known as submarine steel features a 155% higher cohesivesness compared to 316L. Due to Mn and Mo "ingredients" the austenitic steel is more sturdy. Submarine steel is the best steel you can chose for for frequent underwater activities and therefore is the better option for a diver's watch. Martensitic, ice-hardened steel, wouldn't be the optimal choice. Those knowing Konrad Damasko know why he went for submarine steel though.
 
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