Changsha Haochang Machinery (HC Enginepart) supplies replacement piston rings for the MAN B&W S70ME-C, a two-stroke low-speed crosshead marine diesel engine with a 700 mm cylinder bore. The S70ME-C is part of MAN B&W's electronically controlled ME-C series, commonly installed as main propulsion on large container ships and bulk carriers. HC produces piston rings to OE specifications with diameter coverage from φ30 to 800 mm — encompassing the S70ME-C's 700 mm bore — under ISO 9001:2015 certification. HC also supports drawing/sample-based development for customers needing custom ring profiles or material specifications.