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Marine main engine piston rings are core components installed in piston grooves of marine diesel engines, with three primary functions: sealing combustion gas inside the cylinder, controlling engine oil distribution on the cylinder wall, and conducting heat from the piston to the cylinder liner. These components operate under conditions of elevated combustion temperature, cyclic explosive pressure, and long-term reciprocating friction, which place consistent requirements on material stability and dimensional accuracy.
The piston rings are produced from high-chromium ductile cast iron and wear-resistant alloy raw materials, manufactured via centrifugal casting and precise quenching forming. This material and process combination delivers structural elasticity and surface hardness adapted to variable-load marine operating environments. The formulation supports resistance to abrasion and corrosion from high-temperature fuel gas and heavy fuel oil residues during operation.
Parameter | Details |
Base material | High-chromium ductile cast iron, wear-resistant alloy |
Forming process | Centrifugal casting, quenching forming |
Machining process | 5-axis CNC finish machining, mirror grinding |
Surface treatment | Vacuum nitriding, chromium plating |
Outer circle flatness & opening clearance tolerance | ≤0.008mm |
Continuous operation duration | 12,000+ hours under variable marine loads |
Batch qualification rate | 99.7% |
Field operation failure rate | <0.3% |
Certification | CCS Type Approval Certificate |
Custom production cycle | 7-15 working days |
Our company specializes in providing comprehensive spare parts for all the aforementioned brand ship engines, including cylinder liners, pistons, injectors, connecting rods, seals, bearings, oil heads, plungers, and more. We offer both stock availability and customized supply options to meet the maintenance needs of various marine diesel engine systems
All piston rings undergo 5-axis CNC finish machining and mirror grinding processes, with outer circle flatness and opening clearance tolerance controlled within 0.008mm. Assembly dimensions and elastic pressure are designed to align with marine engine supporting standards. This machining precision helps reduce uneven pressure and excessive gaps under high-temperature and high-pressure working conditions, supporting stable engine operation during long-distance voyages.
Vacuum nitriding and chromium plating processes are applied to the working surface, forming a dense hard wear-resistant layer. This layer enhances friction resistance and high-temperature fatigue performance, adapting to marine environments with humid salt spray, alternating cold and hot loads, and acidic combustion exhaust gas.
Before delivery, every batch of piston rings completes raw material spectrum detection, high-speed reciprocating friction test, high-temperature elastic aging test, and full dimensional inspection. Official factory test reports, dimensional parameter sheets, and performance detection data are provided with all orders, allowing ship maintenance facilities to proceed with installation directly without secondary performance testing.
Marine main engine piston rings are suitable for long-distance voyages of ocean-going vessels such as container ships, oil tankers, and bulk carriers. They help reduce cylinder air leakage, engine oil consumption, and power attenuation during maritime operations, supporting steady cylinder sealing and power compression performance. The products also adapt to all-weather heavy-duty operations of harbor tugs and offshore platform supply vessels.
MAIN ENGINE | MAN B&W | S26MC,L/S35MC,L/S42MC,L/S50MC,L/S60MC,L/S70MC,L/S80MC,L/S90MC,S46MC-C,S50MC-C,S60MC-C,S70MC-C,S80MC-C,S90MC-C,K90MC-C,K98MC-C,K/L45GF(CA),55GF(CA),67GF(CA),80GF(CA),90GF(CA) |
WARTSILA | 6L20,9L20,8L32,R22,R32,L20,L32 | |
PIELSTICK | PC2-2,PC2-5,PC2-5L,PC2-5V,PC2-6,PA4,PA5,PA6 | |
HANSHIN | EL30-44,ELS-35,44,LH-28G,LU24-54,LUN28AR(G),LUS24-58,LF46-58 | |
NIIGATA | 16HS,16X,18CX,19HX,20AX,25BX,25CX,26AFTE,26KGHS,28AFTE,28BX,28KGHS,31EZ,31X,32CLX,34AFTE | |
SULZER | RTA38,RTA48,RTA52,RTA58,RTA62,RTA68,RTA72,RTA76,RTA84,RL(A/B)56,RL(A/B)66,RL(A/B)76, RL(A/B)90,RND68,RND76 | |
AKASAKA | A31,A34,A38,A41,A45,AH25,AH27,AH28,AH30,AH38,AH40,K28,K31,DM28FD,DM38FD,DM40FD,DM51SS | |
MITSUBISHI | UEC33LSE,UEC37LA,UEC45LA,UEC50LS,UEC52LA,UEC52LS,UEC60LS,UET45/75C,UET45/80D, UET52/90D,UET52/105H | |
AUX.ENGINE | MITSUBISHI | S6A,S6B,S6R,S6N,S16N,S16R,S12R,SA2 |
MAN B&W | 16/24,20/27,21/31,23/30,25/33,28/32,32/40,48/60,58/64 | |
YANMAR | HAL,KL,KDL,KFL,RAL,MAL,S165,S185,M200,M220,T220,T240,T260,Z280,N165,N18,N21,N165,N260,N280, N330,NY16,EY18,EY22,EY26,4CHL,6CHL | |
DAIHATSU | DK20,DK26,DK28,DK32,DL16,DL19,DL20,DL22,DL24,DL26,DL28,DL32,DS18,DS19,DS22,DS26,DS28,DS32, DS40,PK14,PK16,PL24,PL26,PS18,PS20,PS22,PS26,PS30 |
Standard orders are packed in neutral white boxes and brown cartons. For clients with registered patents, branded packaging is available upon receipt of official authorization letters.
Standard stock orders are dispatched within 7 to 10 days after payment confirmation. Custom production orders have a lead time of 7 to 15 working days, depending on order quantity and technical requirements.
Yes, production can be carried out based on customer-provided samples or technical drawings, with corresponding molds and fixtures developed accordingly.
All piston rings are supplied with official CCS Type Approval certificates, along with factory test reports and dimensional parameter sheets.
