... the chains parts are double plated before assembling. The chain surface coatings protect the chains against corrosion environments. The coating ... chromium is not used, so it is environmentally safe. Leaf chain(Bl series) LH2422, LH2423, LH2434, LH2444, LH2488, LH2466, ... The temperature of the DT treatment process is low; so chain strength is unaffected. Accordingly, the tensile strength and allowable ...