Yeah, even a small % of sulfur can shave off 50% or more of your strength. A small amount of phosphorus (<1%) can raise the DBTT above 0°C. The average ocean

Yeah, even a small % of sulfur can shave off 50% or more of your strength. A small amount of phosphorus (<1%) can raise the DBTT above 0°C. The average ocean temp at 200m is 4°C, so you could understand why the steel chemistry is important in subs. Luckily, these can be tested for non-destructively.