目前在高研磨性和坚硬的岩层中广泛采用钢粒钻进。由于钢粒钻进孔底的破碎过程是，钢粒在外力的作用下，沿孔底滚动或拖动，使岩石压皱或压碎，因此，钢粒应具有高的硬度和韧性。目前，钢粒的热处理是采用电炉或反射炉，质量虽不断改善，但是仍不能经受长时间的动载作用，并且磨损较快。例如，用电炉加热，温升缓慢，对淬火后的钢粒结构，产生 Steel grain drilling is currently widely used in highly abrasive and hard rock formations. Due to the fracture process of the steel drilled into the bottom of the hole, the steel grains are rolled or dragged along the bottom of the hole under the action of external forces to crush or crush the rock. Therefore, the steel grains should have high hardness and toughness. At present, the heat treatment of steel pellets uses electric furnaces or reverberatory furnaces. Although the quality of the steel pellets is continuously improved, it still cannot withstand a long period of dynamic load, and wear is rapid. For example, heating with an electric furnace, the temperature rises slowly, and produces a steel grain structure after quenching.