The development history of stainless steel filter cartridges can be traced back to the mid-20th century, when the industrial sector's demand for corrosion-resistant and high-temperature-resistant filter materials was growing. In the early stages, 201 nickel-free stainless steel was mainly used as the base material, but its corrosion resistance was relatively poor. With increasing industrial demands, 304 stainless steel was introduced, possessing excellent corrosion resistance and good mechanical properties. 304L and 316 series stainless steels further improved performance; 316 stainless steel, due to the addition of molybdenum, exhibits significantly better resistance to chloride corrosion than the 304 series.
In terms of structural design and manufacturing processes, the technology has evolved from the initial single-layer planar mesh to multi-layer composite structures, available in various shapes such as circular, rectangular, oblong, and elliptical. The introduction of sintering technology has resulted in porous materials with gradient filtration capabilities, typically composed of five layers: a reinforcing layer, a protective layer, a filter layer, a separation layer, and a support layer. High-precision argon arc welding technology is used in the welding process. The pleated filter cartridge structure is manufactured through a multi-pleat folding process, significantly increasing the effective filtration area.
Its applications have expanded to industrial manufacturing, petrochemicals, healthcare, aerospace, and other fields, used in air filtration, slurry filtration, and pharmaceutical filtration. Current challenges include cost and corrosion in extreme environments, while future development trends involve materials innovation, automated manufacturing, and intelligent integration.
