Material Selection for Jaw Crushers
Jaw crushers are one of the most commonly used pieces of equipment in industries such as mining, metallurgy, construction materials, highways, railways, water conservancy, and chemicals. They represent a comprehensive technological upgrade from conventional jaw stone crushers. Our company's jaw stone crushers feature a high crushing ratio, uniform product particle size, simple structure, reliable operation, easy maintenance, and economical operational costs. What are the key considerations in material selection?
During design, the crushing plates of the moving jaw and fixed jaw should be arranged with tooth peaks facing tooth valleys. This ensures that during crushing, the material is subjected not only to compression but also to bending forces, making it easier to break. To enhance the service life of the crushing plates, those in medium and small-sized crushers are designed with symmetrical upper and lower shapes, allowing them to be flipped for use after the lower surface wears out; For large jaw crushers, the crushing plates are designed as several symmetrical pieces, allowing them to be swapped after wear.
The material for crushing plates can be white cast iron. White cast iron has high hardness, good wear resistance, is readily available, and is cost-effective; however, it is brittle, prone to breaking, and has a short service life. To extend the service life of the crushing plates, manganese steel with a manganese content of over 12% is preferable, with ZGMn13 being the most commonly used. Manganese steel has good toughness, although its hardness is not high (approximately 210 HB). However, due to its cold work hardening properties, it continuously strengthens under pressure. Thus, it continuously wears down and strengthens during operation until it is worn out and cannot be used anymore.
After casting, manganese steel crushing plates undergo water quenching treatment, which is similar to quenching. The cast manganese steel crushing plates are heated to 1000–1100°C and then rapidly cooled in water. After water quenching, a uniform microstructure is obtained, and the microstructure is fixed, preventing natural phase transformations during use that could degrade performance. The drawback of manganese steel is its higher cost; however, when considering factors such as service life and cost, ZGMn13 offers a longer service life and lower cost compared to white cast iron.
To enhance the service life of jaw crusher plates, improvements can be made in design material selection, assembly, and usage processes, effectively extending the service life of jaw crusher plates, thereby increasing the production efficiency of jaw crushers and reducing production costs. If you require jaw crushers or related equipment, please click on the website customer service to consult for free immediately.
