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More higher hardness, more abrasion resistance of steel shot?  

Steel shot is a commonly used metal workpiece processing material in shot blasting. The steel shot has a tight structure and uniform particle size. Treating the surface of a metal workpiece with the steel shot can increase the surface pressure of the metal workpiece and can improve it. Fatigue resistance of the workpiece. The use of steel shots to treat the surface of metal workpieces has the characteristics of fast cleaning speed. The steel shots have appropriate hardness and good resilience. The workpieces with complex internal corners and complex shapes can be cleaned uniformly and quickly, shortening the surface treatment time and improving work Efficiency is a good surface treatment material. So, the higher the hardness of the steel shot, the better the abrasion resistance? Today, Dongjiu Xiaobian takes you to understand the relationship between the hardness and wear resistance of steel shots.

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The research and production practice show that the composition of the steel shots is similar to the hardness and the wear resistance is very different, which is related to the matrix structure.


1. When the hardness of steel shots is similar, the wear resistance of heat-treated steel shots is higher than that of non-heat-treated steel shots.

2. When steel shots with different composition contents reach similar hardness through heat treatment, their wear resistance is different.

3. The relationship between the hardness and wear resistance of steel shots is expressed by coordinates. For heat-treated steel shots, if the relationship line is extrapolated, it intersects the ordinate. This shows that the hardness and wear resistance of heat-treated steel shots cannot be expressed in a simple proportional relationship.

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Therefore, the steel pellets were tested for adhesion and wear under different microstructures in medium carbon drilled nickel-molybdenum steel. It was found that there was no linear relationship between hardness and wear resistance. The results show that it is not always appropriate to judge wear resistance based on hardness of steel shots. The surface hardness of the steel shot after abrasion, it is found that there is a good linear relationship between wear and surface hardness. For example, in different heat treatment states, using two straight lines can better explain the relationship between volume hardness and wear resistance than using one. Under the condition of quenched martensite and low temperature tempered martensite, the wear resistance of steel pellets increases significantly with increasing hardness. After annealing and tempering above 300 ° C, the wear resistance changes little when the hardness increases.


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