Application of special alloys in the field of seawater desalination:

The equipment materials used in seawater desalination process must have corrosion resistance characteristics, and the selection and design principles of materials depend on the service environment of the materials. Stainless steel has become an ideal material due to its corrosion resistance and durability, and is used in various desalination methods in engineering.

Due to the presence of a large amount of corrosive substances in seawater, and the components required for the manufacturing of seawater desalination equipment such as casings, water pumps, evaporators, and high-temperature pipelines that come into direct contact with high concentrations of seawater, they must have strong corrosion resistance. Therefore, general carbon steel is not suitable for use. Super austenitic stainless steel, super duplex stainless steel, and cold-rolled titanium materials have excellent seawater corrosion resistance, which can meet the material requirements of seawater desalination engineering and are ideal materials for multi effect distillation and reverse osmosis seawater desalination plants.

At present, the manufacturing capacity of seawater desalination equipment and supporting equipment in China is still weak. The core materials and key equipment for reverse osmosis seawater desalination, such as seawater membrane modules, energy recovery devices, high-pressure pumps, etc., mainly rely on imports. According to the investment price ratio of engineering equipment, the localization rate is less than 50%; There is still a significant gap between the heat transfer efficiency of seawater resistant pipes and steam injection devices (heat pumps) used in the distillation method and the international advanced level. At the same time, the scale of enterprises engaged in the manufacturing of seawater desalination equipment and the construction of complete engineering sets in China is generally small, with a weak manufacturing foundation and weak ability to transform technological achievements, which seriously restricts the industrialization process of seawater desalination technology; The manufacturing industry chain of seawater desalination equipment has not yet formed, and even if production lines are imported from abroad, most of the raw materials still need to be imported, making it difficult to form a strong brand effect; We have not yet formed a manufacturing base for seawater desalination equipment and specialized leading enterprises or enterprise clusters with international competitiveness, nor do we have the ability to compete with foreign companies in the market.

Commonly used in seawater treatment equipment, seawater heat exchangers, and pipelines for acidic gas environments. Hydraulic, injection pipelines, fasteners, etc. in marine engineering.

Special alloy materials commonly used in the field of seawater desalination:

Stainless steel: 317L, 1.4529, 254SMO, 904L, AL-6XN, etc

Nickel based alloys: Alloy 31, Alloy 926, Incoloy 926, Incoloy 825, Monel 400, etc

Corrosion resistant alloy: NS112

Corrosion resistant alloy: The equipment materials used in the NS112 seawater desalination process must have corrosion resistance characteristics, and the selection and design principles of the materials depend on the service environment of the materials. Stainless steel has become an ideal material due to its corrosion resistance and durability, and is used in various desalination methods in engineering.