接杆钻眼 2) lengthening rod 钻杆接杆 3) drill rod joint 钻杆接头 1. Wearing resistance ofdrill rod jointis an important study in drill machine manufacture for years. 以钻杆接头常用材料40Cr为试验材料,对其经粉末固体渗硼后的耐磨性、耐蚀性进行了研究,结果表明,渗硼后其耐磨性提高7倍以上,耐蚀性也有...