steel ring materials

Dongya purchases a series of steel ring materials from well-known international companies, which can meet the design requirements of various structures and surface treatment piston ring. At the same time, in accordance with the ISO-6621-3:2000 standard, according to customer needs and engine performance, we independently develop various cast iron ring materials.

Piston rings are crucial components in internal combustion engines, responsible for sealing the combustion chamber, maintaining compression, and regulating oil consumption. Choosing the right material for piston rings is essential for optimal engine performance and longevity. Here's an introduction to some common piston ring materials:

Alloy Steel: Alloy steel piston rings are made by combining steel with other elements like chromium, molybdenum, or nickel to enhance specific properties such as wear resistance, hardness, and heat resistance.

Stainless Steel: Stainless steel piston rings offer excellent corrosion resistance and are commonly used in applications where exposure to corrosive environments is a concern, such as marine engines.

Ceramic: Ceramic piston rings are made from materials like silicon nitride or silicon carbide. They offer superior wear resistance and thermal stability, making them ideal for high-performance and racing engines.

Coated Rings: Regardless of the base material, piston rings are often coated with materials like chromium, molybdenum, or nitride to further enhance their properties, such as reducing friction, improving wear resistance, and aiding in lubrication retention.

Piston Kit：The Piston Kit is a crucial component within an internal combustion engine, designed to facilitate the transfer of energy generated by the combustion process into mechanical motion. Comprising a piston, piston rings, wrist pin, and circlips, this assembly operates within the cylinder bore, moving up and down in response to the combustion forces. The piston's precise fit within the cylinder ensures efficient compression and combustion of the air-fuel mixture, while the rings provide a tight seal to prevent leakage of gases. The wrist pin connects the piston to the connecting rod, enabling the reciprocating motion to be transferred to the crankshaft. Overall, the Piston Kit plays a fundamental role in the performance and reliability of an engine, making it a vital component in automotive and other machinery applications.

Sealing parts：Sealing parts are essential components utilized in various engineering applications to prevent leakage or contamination of fluids, gases, or other substances. Seals are employed to prevent leakage along rotating shafts or moving components, ensuring efficient operation and longevity of machinery. Packing materials, such as braided rope or cord, are utilized in applications requiring sealing around reciprocating or oscillating shafts, valves, or pumps. Overall, sealing parts play a critical role in maintaining the integrity and functionality of various systems across industries ranging from automotive and aerospace to manufacturing and oil and gas.

When selecting piston ring materials, factors such as engine type, operating conditions, performance requirements, and cost must be considered to ensure optimal performance and durability. Additionally, advancements in material science continue to drive the development of new piston ring materials with improved properties and performance characteristics.

●Cast iron piston ring materials
Dongya marks	Elastic Modulus	Flexural Strength（Mpa）	Hardness (HV30）	ISO Material category
High alloy cast iron DH31	100000～130000	≥500	320～440	MC24
Alloy cast iron DH33	95000～125000	≥450	240～330	MC13
Carbon cast iron DH34	130000～160000	≥650	365～450	MC32
Carbon cast iron DH34A	115000～150000	≥800	400～510	MC25
Carbon cast iron DH34B	115000～150000	≥650	365～470	MC25
High alloy cast iron DH36	100000～130000	≥500	390～500	MC23
Alloy cast iron DH37	100000～130000	≥500	290～410	MC22
Ductile Iron DQ20	145000～175000	≥1300	290～420	MC53