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西宁特殊钢集团公司自1986年以来研制并生产了各种规格的中空钢和梯型螺纹重型凿岩机钎杆，针杆的质量和使用寿命已达到国内先进水平。重型凿岩机钎杆采用的钢种为23CrNi3MoA，该钢经热处理后具有良好的韧性和较高的强度，并且二者配合良好。但是，该钢成本较高；采用热穿孔一
Since 1986, Xining Special Steel Group Company has developed and produced various specifications of hollow steel and ladder screw heavy rock drill rod, the quality and service life of the needle bar have reached the advanced domestic level. Heavy drill rock drill rod used for the 23CrNi3MoA steel, the steel after heat treatment has good toughness and high strength, and both with good. However, the higher cost of the steel; the use of a hot piercing