Sichuan Liaofu Special Steel Company is one of the most experienced manufacturers and suppliers of 21-2n engine valve steel x55crmnnin20-8 x55cr2mn8ni2n in China. With over 20 years' experience, our factory offer high quality products made in China with competitive price. Welcome to contact us for wholesale service.
21-2N (also known as X55CrMnNiN20-8 or X55Cr2Mn8Ni2N) is a high-performance alloy steel commonly used in engine valve manufacturing, particularly for internal combustion engines that require high strength, heat resistance, and durability under extreme conditions. Here's an overview of the material:
Key Properties:
Chemical Composition:
Chromium (Cr): 5.5%
Manganese (Mn): 8%
Nickel (Ni): 2%
Nitrogen (N): 0.1-0.2%
This composition gives the alloy a combination of excellent heat resistance, strength, and corrosion resistance.
High Temperature Resistance:
The high chromium content helps improve the material's resistance to oxidation and thermal fatigue, which are critical for engine valves exposed to high temperatures. The manganese and nickel components further enhance these properties.
Good Wear Resistance:
The addition of manganese increases wear resistance, making 21-2N suitable for the high-stress environment of engine valves that undergo repeated cycles of opening and closing.
Corrosion Resistance:
The presence of chromium and nickel provides resistance to corrosion, particularly in exhaust gas environments where chemical attack is a concern.
Applications:
Engine Valves:
21-2N is predominantly used for manufacturing engine valves, particularly in high-performance internal combustion engines (ICEs) where the components are subjected to high thermal and mechanical stress. This includes both intake and exhaust valves that need to withstand elevated temperatures and corrosive exhaust gases.
High-Performance Engines:
The material is used in both standard automotive and performance engines, where the operating temperatures and stress levels are higher than typical valves. The combination of strength and durability helps extend the life of the engine.
Exhaust System Components:
Because of its heat and corrosion resistance, 21-2N is also employed in parts of the exhaust system, including exhaust valves, that are directly exposed to hot exhaust gases.
Mechanical Properties:
Tensile Strength: It offers high tensile strength, making it suitable for parts under high mechanical load.
Yield Strength: The material is able to withstand higher stresses before deformation begins, which is crucial for the dynamic forces experienced in engine components.
Hardness: The hardness of 21-2N ensures good wear resistance, especially when subjected to constant friction and heat in engine cycles.
Advantages:
Excellent High-Temperature Performance: 21-2N can endure the high temperatures in engine combustion chambers without losing its mechanical properties.
Thermal Fatigue Resistance: It has good resistance to thermal shock, which is vital for parts that cycle rapidly between high and low temperatures.
Oxidation and Corrosion Resistance: It resists degradation in hot and chemically aggressive environments, increasing the longevity of engine valves.
Durability: With its high tensile and yield strength, it can withstand the stresses that are typical of engine operation, ensuring reliable performance.
Disadvantages:
Cost: High-alloy steels like 21-2N can be more expensive than standard materials due to the alloying elements and the processing required.
Machinability: High-performance steels may require specialized machining techniques due to their hardness and toughness, which could increase manufacturing costs.
Summary:
21-2N (X55CrMnNiN20-8) is an ideal material for engine valves, offering a balance of heat resistance, wear resistance, and mechanical strength. Its chemical composition ensures good oxidation and corrosion resistance, making it suitable for use in high-performance and high-stress environments such as internal combustion engines.
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