해수 담수화 산업에서 316L 스테인리스강의 적용

Desalination equipment is widely used in areas where fresh water is scarce. Due to its prolonged contact with seawater, the materials used must possess excellent corrosion resistance. Desalination equipment utilizes a variety of materials, with common shells and heat exchange materials including carbon steel, 스테인레스 스틸, titanium tubes, copper tubes, and aluminum tubes.

The materials used in the desalination process must exhibit corrosion resistance. Material selection and design principles are determined by the material’s service environment. Stainless steel, due to its corrosion resistance and durability, is an ideal material and is used in various desalination projects.

Stainless steel used in desalination projects requires excellent corrosion resistance in a variety of complex environments. Austenitic stainless steels 316L and 317 are the primary materials used in desalination equipment. 316L can withstand corrosion in marine environments, but long-term immersion in seawater can lead to pitting and crevice corrosion.

Pitting corrosion of stainless steel used in desalination equipment that processes hot concentrated seawater in chloride-containing environments is a particular concern. Although the lack of oxygen in hot seawater reduces the tendency for pitting corrosion, and 316L stainless steel is a traditional material for evaporators, most modern multi-stage flash desalination (MSF) plants do not use 316L stainless steel.

Alloy 316L, supplied by Dingliang Metal, is a low-carbon stainless steel widely used in the chemical industry for its excellent corrosion resistance. 316L is a derivative of type 18-8 austenitic stainless steel with a 2-3% Mo addition. 316L의 Mo 함량은 우수한 구멍 부식 저항성을 제공합니다, Cl-와 같은 할로겐 이온이 포함된 환경에서 사용하기에 안전합니다. 316L은 주로 화학적 특성 때문에 사용되므로, 제철소에서는 316L에 대해 표면 검사 요구사항이 약간 낮습니다 (에 비해 304). 표면 요구사항이 더 엄격한 고객은 표면 검사를 강화해야 합니다.