The hardness of the high-chromium wear-resistant hammer is an important factor affecting its wear resistance. In general, the hardness of the high-chromium wear-resistant hammer is required to be more than 0.8 times that of the abrasive to obtain better wear resistance. It should be noted that this hardness refers to the hardness of the working surface of the high-chromium wear-resistant hammer head after wear, not the initial hardness before wear.

　　High-chromium wear-resistant hammer When the higher hardness Hu of the metal exceeds 0.8Ha (Ha is the hardness of the abrasive), the metal surface becomes likely to blunt the sharp corners of the abrasive, so the wear of the material to the abrasive becomes "soft" Abrasive wear, its relative wear resistance b begins to exceed the value β of the material measured on hard abrasives. Test parameters such as abrasive properties, particle size, sample size, load size, etc. have little effect on the β value, while on soft abrasives The b value determined above is determined by the relative hardness Hu/Ha, and is particularly sensitive to the particle size, especially the particle breakage. It is easy to be broken in the middle, and the increase of the wear resistance with the increase of the relative hardness Hu/Ha will be slower.

　　However, the hardness of the high-chromium wear-resistant hammer is not as high as possible. Under certain working conditions, the excessively high hardness can easily lead to the initiation of micro-cracks. For the abrasive wear of the micro-cutting mechanism, increasing the hardness of the high-chromium wear-resistant hammer is beneficial to the improvement of wear resistance. For abrasive wear with fatigue spalling mechanism, the higher hardness of the high-chromium wear-resistant hammer is matched with good plasticity and toughness, especially with good fracture toughness, low crack growth rate and high impact fatigue resistance. , which is conducive to the improvement of wear resistance.