OEE also supply ceramic liner,hardened liner and chrom-plated liner.description are as following:

ceramic liners combine the strength of a forged steel outer shell with the abrasion and corrosion resistance of a ceramic inner sleeve. We provide Zirconia (ZrO3) Sleeves as well as Alumina(Al2 O3.) sleeves., of which Zirconia exhibits better impact strength, higher hardness and be honed to finer surface finishes than alumina.

chrome-plated liners made from premium forged steel with the core plated by chrome. The chrome-plated liners have hardening characteristics of 58 to 62 Rockwell C Hardness

Material is 45# forged steel, tensile strength is σb ＞610MPa, yield strength is σs ＞450MPa, elongation is δ＞17%, hardness is HRC180-200. The bore is plated by chrome, thickness is 0.15-0.18mm, hardness is HRC58-60.

hardened liners offer economy in a liner that is made for normal to mildly corrosive mud conditions. These liners are hardened and heat treated under strict quality control to a minimum of 60 RC hardness and a depth of .125 inches. Each liner is honed to a mirror-like finish for smooth and even wear during the life of the liner and is machined to close tolerances to assure easy installation and long life.