The structure of the jaw crusher is mainly composed of a movable Jaw Crusher Plates, a fixed jaw plate and an eccentric shaft. When the eccentric shaft rotates, the movable jaw plate mainly bears the squeezing action of the material, and the fixed jaw plate mainly bears the sliding cutting action of the material. As a component with high jaw wear rate, the choice of Jaw Crusher Plates material is related to the cost and benefit of users.
What are the jaw materials of the jaw crusher?
High manganese steel
High manganese steel is the traditional material of the jaw plate of jaw crusher, which has good impact load resistance. However, due to the structure of the crusher, the opening angle between the movable and fixed jaws is too large, which is easy to cause abrasive sliding and deformation due to deformation. Insufficient hardening makes the surface hardness of the jaw plate low, short-cut abrasive cutting, and the jaw plate wears faster.
In order to improve the service life of the Jaw Crusher Plates, a variety of jaw plate materials have been developed, such as adding Cr, Mo, W, Ti, V, Nb and other elements to modify high manganese steel, and perform dispersion strengthening treatment on high manganese steel. Improve its initial hardness and yield strength. In addition, medium-manganese steel, low-alloy steel, high-chromium cast iron and high-manganese steel composite have been developed, all of which have achieved good results in production.
Medium Manganese Steel
Medium-manganese steel was developed by Climax Molybdenum Company and was officially listed in the US patent in 1963. The hardening mechanism is: after the amount of manganese is reduced, the stability of austenite decreases, and when it is impacted or worn, the austenite is easily deformed to induce martensite transformation, which improves its wear resistance. The usual composition of medium manganese steel (%): 0.7-1.2C, 6-9Mn, 0.5-0.8Si, 1-2Cr and other trace elements such as V, Ti, Nb, rare earth, etc. The actual service life of medium manganese steel jaws can be increased by more than 20% compared with high manganese steel, and the cost is equivalent to that of high manganese steel.
High chromium cast iron
Although high chromium cast iron has high wear resistance, but because of its poor toughness, the use of high chromium cast iron as the jaw plate does not achieve good results. In recent years, high-chromium cast iron is used for inlay casting or bonding on the high-manganese steel jaw plate to form a composite jaw plate, which has a relative wear resistance of more than 3 times, which significantly improves the service life of the Jaw Crusher Plates. This is also a way to increase the service life of the jaw, but its manufacturing process is more complicated, so it is more difficult to manufacture.
Medium carbon low alloy cast steel
Medium-carbon low-alloy cast steel is also a widely used wear-resistant material. Due to its high hardness (≥45HRC) and appropriate toughness (≥15J/cm²), it can resist the cutting and repeated extrusion of materials. The fatigue peeling, thus showing good wear resistance. At the same time, medium-carbon low-alloy cast steel can also be adjusted in composition and heat treatment process, so that the hardness and toughness can be changed in a large range to meet the requirements of different working conditions. The production operation test shows that the service life of general medium-carbon and low-alloy steel jaws can be increased by more than 3 times than that of high-manganese steel.
Which jaw material is better?
In summary, the choice of jaw plate material ideally should meet the requirements of high hardness and high toughness, but the toughness and hardness of the material are often contradictory. Therefore, in the actual selection of materials, it is necessary to fully understand the working conditions and choose the material.
1) Impact load is one of the important factors that should be considered in a reasonable selection of materials.
The larger the specification, the heavier the wearable parts, the more the fragmentation of the material to be crushed, and the greater the impact load it bears. At this time, modified or dispersion strengthened high manganese steel can still be used as the target of material selection.
For medium and small crushers, the impact load on the wearable parts is not very large, and it is difficult to fully work harden it with high manganese steel. Under such working conditions, choosing medium-carbon low-alloy steel or high-chromium cast iron/low-alloy steel composite materials can achieve good technical and economic benefits.
2) The composition and hardness of the material are also factors that cannot be ignored in a reasonable selection of materials.
Generally speaking, the higher the hardness of the material, the higher the hardness requirements for the wear parts. Therefore, under the condition of meeting the toughness requirements, the material with high hardness should be selected as much as possible.
Eternal Bliss Alloy Casting & Forging Co, Ltd.
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