Three-body type composite casting wear-resistant lining plate and manufacturing method thereof

Abstract

The invention provides a three-body type composite casting wear-resistant lining plate which comprises a back layer, a transition layer and a surface layer which are arranged in sequence, the back layer is made of medium and low carbon steel, a filter layer is made of ferritic nodular cast iron, and the surface layer is made of high-chromium molybdenum wear-resistant white cast iron. According to the wear-resistant lining plate, the transition layer is additionally arranged between the surface layer high-chromium-molybdenum wear-resistant white cast iron and the back layer medium-low carbon steel, so that the wear-resistant lining plate not only has wear resistance, but also can endure a violent impact working condition, the adhesion between the layers is better, and the casting technological process is simplified; the invention further provides a manufacturing method of the three-body type composite casting wear-resistant lining plate, the ideal three-body type composite casting wear-resistant lining plate can be obtained, the shrinking percentage is in smooth transition, combination is tight and natural, casting stress is greatly reduced, and casting defects are remarkably reduced; and then the three-body type composite casting wear-resistant lining plate blank is subjected to quenching and tempering treatment, so that the three-body type composite casting wear-resistant lining plate has better mechanical properties.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a three-body composite cast wear-resistant liner and a manufacturing method thereof. Background technique [0002] Due to its unique and excellent performance, bimetallic wear-resistant linings are getting more and more attention and applications. Two metal materials with different properties are casted to form a complete casting. The surface layer (working surface) is made of wear-resistant alloy material, which has strength and hardness, and the back layer is made of non-brittle metal material, which has plasticity and toughness, which complement each other and complement each other. [0003] The traditional upper layer material is high chromium molybdenum anti-wear white cast iron with HRC ≥ 55, and the back layer material is medium and low carbon steel. In this way, the bimetallic lining combines the advantages of the two. Under the premise of not breaking or breaking, t...

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Problems solved by technology

[0004] However, many disadvantages have been found in the manufacturing and application process of the bimetallic wear-resistant lining plate formed in this way, and it is necessary to optimize it in the implementation process

[0005] First of all, the surface layer is made of anti-wear white cast iron, and the back layer is made of medium and low carbon steel. One is iron and the other is steel. The carbon content of the two is very different, the structure is different, the phase diagram is different, and the melting at high temperature produces differences. There is a certain degree of difficulty, it is easy to form a barrier, and it cannot be seamlessly connected after solidification and cooling, resulting in cracks and even delamination

[0006] Secondly, the casting shrinkage of the two is twice the difference, including linear shrinkage and volume shrinkage, the shrinkage of iron is 1%, and the shrinkage of steel is 2%, so the combination is not very smooth during the melting process, and a considerable cast is formed. The stress is inherently insufficient, leaving hidden dangers for future installation and application

[0007] Finally, the melting points of the two are not the same, the melting point of iron is around 1400°C, and the melting point of steel is above 1500°C, so the casting properties of the two are different, such as fluidity and mold filling. Setting time requirements vary, adding to the difficulty of the manufacturing process

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