Selection of Wear – Resistant Materials for Crushers in Construction Waste Crushing
Understanding the Composition and Characteristics of Construction Waste
Construction waste mainly consists of solid materials such as soil, stones, concrete blocks, broken bricks, wood, metals, pipes, and electrical appliances. Inorganic materials like soil, stones, concrete blocks, and broken bricks account for over 90% of construction waste. These inorganic materials are characterized by their resistance to acid, alkali, water, and their stable chemical and physical properties, making them excellent renewable building materials. However, construction waste also contains some waste substances such as metals, bamboo, wood, various packaging materials, plastics, and glass, which can be recycled as renewable resources.
The properties of construction waste determine that it requires special consideration when selecting wear – resistant materials for crushers. The waste often contains a mix of materials with different hardness levels, and there may be long steel bars and other hard objects mixed in, which can cause significant wear and impact on the crusher’s wear – resistant parts.
High – Manganese Steel: A Traditional yet Effective Choice
Working Principle and Advantages
High – manganese steel has been a widely used material for crusher wear – resistant parts in construction waste crushing. Its key characteristic is work – hardening. When subjected to large impact or contact stress, the surface layer of high – manganese steel rapidly undergoes work – hardening, which significantly increases its hardness and wear resistance. The work – hardening index of high – manganese steel is five to seven times higher than that of other materials, allowing it to quickly adapt to the harsh working environment of construction waste crushing.
Application Scenarios
High – manganese steel is particularly suitable for crushing medium – hard construction waste materials such as concrete blocks and broken bricks. In a jaw crusher used for the primary crushing of construction waste, the jaw plates made of high – manganese steel can withstand the repeated impact of the incoming waste materials. As the crushing process continues, the surface of the jaw plates gradually hardens, enabling them to better resist the abrasive action of the construction waste. However, if the impact force is insufficient or the contact stress is relatively small during use, high – manganese steel may not be able to quickly undergo work – hardening, and thus its wear resistance cannot be fully utilized.
High – Chromium Cast Iron: Excellent for High – Abrasion Situations
Microstructure and Wear – Resistant Mechanism
High – chromium cast iron is known for its outstanding wear resistance. It contains a relatively high amount of chromium, which promotes the formation of hard carbides such as chromium carbides within the cast iron matrix. These carbides are dispersed throughout the material, acting as hard particles that resist abrasion. After heat treatment, the hardness of high – chromium cast iron can reach 58HRC or even higher, making it highly resistant to wear.
Application in Construction Waste Crushing
In construction waste crushing, high – chromium cast iron is suitable for high – wear and low – impact applications. For example, in a反击式破碎机 (impact crusher) used for the secondary or tertiary crushing of construction waste, the plate hammers made of high – chromium cast iron can effectively resist the abrasive wear caused by the concrete particles and broken bricks. However, high – chromium cast iron has relatively low toughness and is prone to brittle fracture under high – impact loads. Therefore, it is not suitable for crushing construction waste with large – sized hard objects or in situations with high – impact forces.
Composite Materials: Combining the Best of Both Worlds
Structure and Advantages
Composite materials for crusher wear – resistant parts in construction waste crushing typically consist of a wear – resistant layer and a tough base layer. The wear – resistant layer is made of high – hardness materials such as carbides or ceramics, while the base layer uses a material with good toughness, such as high – manganese steel. This design combines the high wear resistance of the hard layer with the good impact – absorbing ability of the tough base layer, providing a balanced performance.
Application Flexibility
Composite materials are highly versatile and can be used in a wide range of crusher wear – resistant parts in construction waste crushing. For example, composite hammers can be used in hammer crushers. The working part of the hammer is made of high – chromium alloy for high wear resistance, while the hammer handle is made of high – manganese steel for good toughness. This design allows the hammer to withstand both the abrasive wear from the construction waste and the impact forces during the crushing process, extending its service life. In addition, composite materials can also be used for the lining plates of ball mills used for grinding construction waste, providing reliable performance in different crushing and grinding stages.
Considerations for Material Selection in Construction Waste Crushing
Material Hardness and Toughness Balance
When selecting wear – resistant materials for crushers in construction waste crushing, it is crucial to balance hardness and toughness. High – hardness materials can resist abrasion well but may be prone to brittle fracture under high – impact loads. On the other hand, materials with high toughness can absorb impact energy but may wear out quickly under abrasive conditions. Therefore, the selection of materials should be based on the specific characteristics of the construction waste, such as the hardness, size, and shape of the materials, as well as the impact and abrasion forces during the crushing process.
Impact of Pre – treatment on Material Selection
Pre – treatment of construction waste is essential before crushing, and it also has an impact on the selection of wear – resistant materials. For example, using a vibration feeder and a magnetic separator to remove long steel bars and metal impurities from the construction waste can reduce the risk of damage to the crusher’s wear – resistant parts. In this case, the wear – resistant materials can be selected based on the remaining materials in the construction waste, focusing more on their ability to resist abrasion from concrete particles and broken bricks.
Long – term Cost – Effectiveness
In addition to performance, long – term cost – effectiveness is also an important factor in material selection. Although some high – performance wear – resistant materials may have a higher initial cost, they can significantly reduce the frequency of part replacements and maintenance costs over the long term. For example, composite materials may have a higher price compared to traditional high – manganese steel, but their longer service life can offset the initial cost difference, resulting in lower overall operating costs for the construction waste crushing plant.
Tangshan Polarislink Advanced Materials Technology Co., Ltd. was established in 1996 and is located in Tangshan, Hebei Province, China. The company is a source manufacturer specializing in wear parts for mining machinery. Relying on its own core factory, the company has been deeply engaged in heavy manufacturing for nearly 30 years, forming a stable industrial foundation centered on manufacturing capability.
The main products include high manganese steel hammers, jaw plates, bushings, mantles, impact plates, high chromium blow bars, cast steel bushings （Mn13/Mn13Cr2，Mn18/Mn18cr2，Mn22/Mn22Cr2） and various other wear-resistant castings, which are widely used in mining crushing, sand and aggregate production, cement and building materials industries. The company is certified by CE and ISO9001, and is capable of long-term batch supply and high-standard customized delivery.
The manufacturing base covers about 100,000 square meters, with a building area of 36,000 square meters, and is equipped with a complete production system including melting, casting, machining, heat treatment and final inspection. With 11 medium-frequency furnaces of 2–10 tons, 2 refining furnaces of 25 tons, 18 heat-treatment furnaces and more than 30 large CNC machines, the annual comprehensive capacity exceeds 50,000 tons, enabling stable production of large, high-strength and high-wear-resistant industrial castings.Official website address:https://www.polarislink.net/
