Hammer head is an important working part of crusher. High-quality wear-resistant hammer head is the basis to ensure the normal operation of crusher. The life of hammer head depends on the quality of hammer head and the characteristics of crushing materials, which also determines the working efficiency of crusher. Mobile gravel crusher leasing manufacturer introduced that the common materials of hammer of crusher in mining machinery industry are as follows: high manganese steel, medium manganese steel, high chromium cast iron, low carbon alloy steel. The hammers made of these materials have their own characteristics and advantages and disadvantages.
1. High manganese steel is the traditional material of hammer head. It is a typical wear-resistant steel against impact wear. It has good toughness and strong work-hardening tendency. It shows excellent wear resistance under impact conditions. Under the action of larger impact or contact stress, the surface layer will produce work hardening rapidly, and its work hardening index is 5-7 times higher than other materials, and its wear resistance is greatly improved. However, the wear resistance of high manganese steel shows its superiority only when it has enough working hardening conditions. In other cases, if the physical impact force is not enough or the contact stress is small, the wear resistance of high manganese steel is very poor.
2. Medium manganese steel not only does not increase the price of hammers, but also achieves the use effect of building high manganese steel hammers. The actual service life of high manganese steel hammers is more than 50% higher than that of building high manganese steel hammers. The advantage of as-cast medium manganese steel hammer is its magnetism, which can be removed by magnetic separation, while high manganese steel has no such advantage.
3. High chromium cast iron is a kind of wear-resistant material with excellent wear resistance, but its toughness is low and brittle fracture is easy to occur. In order to make the hammer of high chromium cast iron run safely, people have developed a composite hammer on this basis, that is, high chromium cast-in-place in the hammer head of high manganese steel or low alloy steel, or high chromium cast in the working part of the hammer head. Iron and hammer handle are made of carbon steel, which are combined to make the head of hammer have high hardness, high wear resistance and high toughness.
4. High chromium cast iron is mainly alloy structural steel containing chromium, molybdenum and other elements. It has high hardness and good toughness, and accords with the high service life of hammer head. Under the same working conditions, its service life is at least 1 times longer than that of high manganese steel hammers. However, its manufacturing process is complex, the process requirements are strict, and the quenching and tempering heat treatment of hammer head is crucial. After quenching and tempering heat treatment, not only the overall tensile strength is over 850 MPa, but also considerable plasticity and toughness are required. At the same time, it is strictly forbidden for iron blocks to enter the crusher, and secondary iron absorption devices are required at the front end of the feed.
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