The cylinder liner in a ship's engine is a cylindrical component that forms the inner wall of the engine cylinder.

It provides a durable surface for the piston to move while maintaining proper compression and lubrication.

It also helps dissipate heat and protect the engine block from wear and corrosion.

Size: Typically ranges from 200 mm to 600 mm in diameter and 500 mm to 2000 mm in length.

Grade: Commonly made from cast iron grades like GG20, GG25, or alloyed cast iron for enhanced durability.

Viscosity: N/A (not applicable as viscosity is a fluid property).

Buoyancy: N/A (not relevant for cylinder liners as they are solid engine components).

Material: Usually made of high-quality cast iron, alloyed cast iron, or sometimes steel with chrome plating for wear resistance.

Surface Finish: Precision honed to achieve a surface roughness of 0.5 to 1.5 µm for optimal piston ring sealing.

Hardness: Typically 180-250 HB for cast iron liners, higher for alloyed or treated variants.

Thermal Conductivity: Approximately 50-60 W/m·K for cast iron liners to manage heat dissipation.

Wall Thickness: Generally 10-30 mm depending on engine size and design requirements.

Coating: Some liners feature chrome plating or thermal spray coatings for improved wear resistance.