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Hardness Characteristics of Steel Shots

Steel shots are spherical abrasives made of high-carbon alloy steel, with a hardness typically ranging from HRC40 to HRC50. After special heat treatment, their hardness can be increased to HRC57 to HRC62. This high hardness enables steel shots to have a longer service life during the shot blasting process and also provides stronger cleaning power. The microhardness of steel shots ranges from 390HV to 530HV, providing a clear scientific basis for their hardness.

Hardness Characteristics of Steel Grits

       In contrast, steel grits are irregularly shaped abrasives made of iron or steel, with a relatively lower hardness. The hardness of steel grits generally falls between HRC45 and HRC65. As steel grits are cast, their internal structure is relatively loose, resulting in lower hardness. This lower hardness leads to greater friction and poorer wear resistance during the shot blasting process.

Scientific Basis for Hardness Comparison

       Hardness measures a material's ability to resist scratching by a hard object. Steel shots, after undergoing multiple heat treatments and quenching processes, have a tight internal structure and high hardness. On the other hand, due to their irregular shape and casting process, steel grits have a relatively loose internal structure, leading to lower hardness.

Application Impacts of Hardness Differences
       The differences in hardness directly affect the application scenarios of steel shots and steel grits. Steel shots, with their high hardness and uniform stress distribution, are suitable for workpieces requiring high surface finish, such as automotive parts, aerospace equipment, and precision machinery. Steel grits, with their lower hardness and angular shape, are suitable for workpieces requiring high surface roughness, commonly used in shipbuilding, bridges, steel structures, pipelines, and surface treatment of large mechanical equipment.

       The differences in hardness between steel shots and steel grits determine their distinct applications in industrial surface treatment. Choosing the appropriate abrasive ensures the effectiveness and efficiency of the shot blasting process, while also enhancing the service life and performance of the workpieces.

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