Bimetallic cylinder of mud pumps is noe of the most vulnerable articles to damage. This product is a mosaic structure formed by two different materials with one of them inserted in the other. The lining of it is composed by a casting material named high-carbon and hign-chromium alloy. The interior apertures whose surface is as smooth as mirrors are processed by grinding. Its overall superior performace has been tested through years of application. It's highly welcome both at home and abroad for its service time 1.3-1.5 times that of other cylinder sleeves produced by other manufactures and the compliance with the SY5064-85 standard. It's totally suitable for high-pressure injection drilling operation.