虽然多数露天煤矿仍然使用钢齿牙轮钻头,但其趋向是使用价格较贵的而更耐用的硬质合金镶齿钻头。许多用户发现,昂贵的硬质合金镶齿钻头能降低穿孔成本。尽管镶齿钻头的成本是一般钢齿钻头的三倍多,但是,把钻头的寿命和穿孔速度计入后,实际的穿孔成本却比较低。由于钢齿钻头成本低,每只140多美元,所以许多矿山选用。近年来,硬质合金镶齿钻头在采场中也逐渐得到普及。煤矿使用的钻头价格为630～7000美元/只,在同样条件下钢齿钻头的钻速开始时与合金齿钻头差不多。但由于牙齿很快磨钝,使用不久其钻速要比合金 While most open-cast mines still use steel-toothed roller bits, the trend is to use more expensive and more durable carbide inserts. Many users find that expensive carbide inserts reduce the cost of piercing. Although the cost of a bit is more than three times that of a typical bit, the actual cost of perforation is lower when the bit life and perforation rate are taken into account. Due to the low cost of steel bit, each more than 140 US dollars, so many mines use. In recent years, cemented carbide inserts have also gained popularity in the stope. Coal mine drill bit price of 630 to 7,000 US dollars / only, under the same conditions, the bit rate of steel bit drill and alloy bit at the beginning of the drill. However, due to the rapid blunt teeth, the use of sooner than the alloy drill speed