329LD : 20Cr - 2.5Ni - 1.4Mo - NAs a kind of Ni and Mo saving Duplex (Lean Duplex) steel, it has superior anti-corrosion, inter-granular corrosion resistance and is used for applications like water pipelines, sea-water and chemical equipments, etc. 329J3L : 22Cr - 5Ni - 3Mo - 0.15NIt contains voluminous elements strengthening the corrosion resistance, such as Cr, Mo and N, etc. and has superior resistance against corrosion from salinity, SCC, pitting corrosion, crevice corrosion, abrasion and erosion, etc. Thus it is mainly used for applications like desalinating, chemical and food processing equipments.