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The function of the alloy element of the wear plate

The function of the alloy element of the wear plate

The toughness of the wear-resistant plate is higher than that of the high-chromium cast iron. The wear resistance is more than 3 times that of the high-chromium cast iron. Wear-resistant steel plates have broad application prospects, and will inevitably replace high-chromium cast iron and become the mainstream of a new generation of high-wear-resistant materials. The alloy elements in the wear-resistant plate can greatly improve the service life of the wear-resistant parts and the operating efficiency of the host, and can completely replace various wear-resistant cast iron materials for abrasive wear conditions. Crusher hammer heads made of high vanadium wear-resistant alloys, rolling mill guide wheels, rolls, etc. are widely used in construction machinery, building materials, mining, power and other industries. They have significant social and economic benefits and have an important role in promoting the development of the national economy.
 
GB/T 24186-2009 wear plate grades: NM360, NM400, NM500, NM550, NM600
 
The excellent wear resistance of the wear plate is mainly due to the high hardness of the carbide (M7 C3), reaching HV1300 to 1800, which can effectively resist the cutting of the material. The carbide of high vanadium and high wear resistance alloy (MC) has a much higher microhardness than high chromium cast iron, reaching about HV2600, and its wear resistance will of course be much higher than high chromium cast iron. The macro hardness of high chromium cast iron is HRC58-64, and the high vanadium high wear resistance alloy reaches HRC60~68, which can effectively protect the carbides, which is also an important reason for the high wear resistance of the high vanadium high wear resistance alloy.
 
High impact toughness is another notable feature of NM360 wear plate. The impact test of 20mm X 20mmX 110mm with a span of 70mm is used for the impact comparison experiment. The impact value of high chromium cast iron is 5~IOJ/cmZ, and under the same conditions, the impact value of high vanadium high wear resistance alloy is 10~ 26)/cmZ, 1 times higher than high chromium cast iron. Therefore, the use range of high vanadium and high wear resistance alloy is wider than that of high chromium cast iron, the safety factor is large, and the residual austenite content is low, and the brittle spalling tendency is small. This is another reason for the high wear resistance of the high vanadium and high wear resistance alloy.
    
Metallurgical organization is the key to determining performance. High chromium cast iron has higher toughness than general alloy cast iron, mainly because the carbides in high chromium cast iron are distributed in the form of isolated rods or flakes, and the cutting of the substrate is small. The carbide of the high vanadium and high wear resistant alloy is almost ideally spherical, with minimal cracking to the substrate, and it is not easy to be broken by the material during use. Therefore, its toughness is twice as high as that of high chromium cast iron, and the wear resistance is It is more than 3 times that of high chromium cast iron.

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