Seal ring chain: effectively lock the lubricating oil and extend the life. Oil-containing sleeve: special oil-containing material is selected, and the chain is free of oil. Alpha treatment pin shaft: wear resistance, high temperature resistance, corrosion resistance seamless sleeve: cold extrusion technology molding, cylinder seamless, roundness greatly improved, not easy to deformation. Strong pre-pulling: the maximum stress of the chain plate is reduced, thereby improving the fatigue strength of the chain plate. Shot blasting treatment: first, compressive stress can be formed on the surface of the chain plate, which can significantly improve the fatigue life of the chain; second, it can reduce the effective stress concentration factor on the surface of the chain plate and prevent micro cracks after quenching on the hole and the surface of the chain plate. Vacuum oiling: the oil on the chain is uniform and sufficient, the lubrication is good, and the service life is extended by more than 30%.