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Technical requirements of submarine steel

Posted:2021-05-26 10:32:50

Because the submarine is sailing and fighting in the deep sea, the service conditions are very harsh, so the requirements for submarine steel are very strict. It can be said that submarine steel is the most stringent type of low-alloy high-strength steel, which mainly requires high yield strength, high toughness and high blast resistance, good weldability, high toughness, good seawater corrosion resistance and low cycle fatigue resistance.

Submarine steel must have good seawater corrosion resistance. The working environment of submarine is ocean. Seawater is a complex equilibrium solution of many kinds of salts, which contains organisms, suspended sediment, dissolved gases and corrosive organic matter. Therefore, seawater is not a simple salt solution. The average salinity of sea water is 35%, of which 90% is chloride, 10% is sulfate and 0.2% is carbonate. It is required that the corrosion of the material in seawater is uniform and small; At the stress concentration, there is no local corrosion; There is no stress corrosion in high strength submarine steel.