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Clutch Disc steel Selection and Performance Requirements

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clutch disc steel strip

Clutch discs are key components in the automotive transmission system, controlling the connection between the engine and the transmission through contact and separation with the flywheel. To ensure the stable operation of clutch discs under working conditions of high temperature, high pressure, and frequent friction, the selection of clutch disc steel and processing technology is crucial and must not be taken lightly. As a common means of transportation for people, the reliability of the quality of automobiles is related to people’s life safety. Every enterprise with a sense of social responsibility should adhere to its bottom line and ensure product quality. At present, Jiaxiao MTC also moving forward in the automotive field, continuously improving product quality, and ensuring the stability of quality through strict process flows.

Characteristics of 65Mn Steel Strip and Its Application in Clutch Discs

65Mn steel strip, as a high-carbon spring steel, is widely used in the manufacture of clutch discs due to its excellent elasticity and strength. The high manganese content in its chemical composition endows the material with good hardenability and hardness while maintaining a certain toughness. The mechanical properties of this steel strip are characterized by high tensile strength and good elongation, which allows it to maintain shape stability while withstanding significant loads. In addition, after appropriate heat treatment, 65Mn steel strip can form a tempered martensite structure, which further improves its wear resistance and service life.

Comparison of 50# Steel Strip and 60Si2Mn Steel Strip

Both 50# steel strip and 60Si2Mn steel strip are suitable materials for manufacturing clutch discs, but they differ in chemical composition and physical properties. The 50# steel strip is a medium-carbon steel with good processing performance and moderate hardness, suitable for manufacturing clutch discs with general requirements. In contrast, the 60Si2Mn steel strip contains a higher silicon content, which allows it to achieve higher hardness after heat treatment, making it more suitable for manufacturing high-performance clutch discs that can withstand larger loads.

Importance of Heat Treatment in Clutch Disc Manufacturing

Heat treatment, including processes such as carburizing and quenching, is a key step in enhancing the performance of clutch discs. It strengthens the performance of clutch discs in the following ways:

  • Enhancing hardness and wear resistance: Heat treatment improves the surface hardness of the clutch discs, making them more resistant to wear caused by friction.
  • Optimizing strength and toughness: Heat treatment not only enhances the hardness of the clutch discs but also improves their overall strength and toughness by forming an appropriate microstructure.
  • Relieving internal stress: Internal stresses that may arise during the manufacturing process can be released through heat treatment, which helps prevent deformation or cracking of the clutch discs during use.
  • Extending service life: Clutch discs treated with heat treatment, due to their improved performance, can maintain a stable working state for a longer period, thus reducing maintenance costs.

Overall, heat treatment not only enhances the physical properties of clutch discs but also ensures their reliability during long-term operation, making it an indispensable part of the clutch disc manufacturing process. Quality control during the heat treatment process is crucial to ensure the performance of the clutch discs. By controlling temperature, cooling rate, atmosphere, as well as hardness testing and metallographic analysis, the effectiveness of heat treatment is evaluated to meet customer requirements, ensuring that the heat-treated steel strips produced can satisfy and reassure customers.

Mechanical Processing and Testing of Clutch Discs

Clutch discs after heat treatment usually need to undergo mechanical processing, such as turning and milling, to achieve precise size and shape requirements. During the manufacturing process, it is necessary to strictly inspect and test the clutch discs, including dimensional accuracy, hardness, and friction coefficient, to ensure they meet performance standards. Moreover, after heat treatment, the clutch discs need to be cleaned to remove surface oil and impurities, and then coated with anti-rust oil to protect the product from corrosion during storage and transportation. After this step, we can proceed with the assembly, where the clutch discs will be assembled with other clutch components (such as pressure plates, release bearings, etc.) into a complete clutch system.


The manufacturing of clutch discs involves multiple steps including material selection, molding, heat treatment, and mechanical processing. Each step requires precise control to ensure the performance and reliability of the final product. A mistake in one step can lead to mistakes in all subsequent steps. Choosing the right clutch discs material is the beginning of success, and the selection of materials is crucial. We must take each step seriously, be down-to-earth, customer-centric, and produce the highest quality steel strips with the highest standards for our customers to use, assisting them in creating a more brilliant career and achieving a win-win situation.

Dear customers, if you do not know how to choose the most suitable steel for you, you can contact our business team to help you find it, saving your time and allowing us to help you make the most correct choice and recommend the most suitable products for you. Jiaxiao MTC willing to be your most solid backing, continuously growing and becoming stronger, clearing the way for you and riding the wind and waves.

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