Material?standard?hammer?drill?rod

Hammer drill rod is made of special hollow rock drill steel. The cross-section shape is hexagonal and circular. Provisions in international standards, hexagonal hollow drill steel hammer drill size is 19mm, 22mm and 25mm; circular connecting rod drill with the hollow rock drill steel size is 32mm, 38mm, 45mm and 51mm; hexagonal light connecting rod drill with a hollow drill steel size is 22mm, 25mm, 32mm, 38mm, 45mm and 48mm, small diameter (light) breaking hammer drill rod.
Our main ZK55SiMnMo steel, while the foreign used mainly in the carbon Cr-Ni-M. Hole drilling method for alloy steel such as Sweden Secoroc company "" (with stainless steel lining) Z708 (4OSiMnCrNiMo) breaking hammer drill rod under the same conditions, the first forging times the average life expectancy of about ZK55SiMnM in china. More than two times the hammer rod.
Large diameter (heavy) breaking hammer drill rod foreign made of low carbon Cr-Ni-M. Department of alloy steel. China in twentieth Century 70 for ZK35SiMnMoV steel, the twentieth Century 90's began to use ZK18CrNi3MoV steel (thermal wear a hot rolling method), and similar foreign "drilling" more crushing hammer drill rod, the average life expectancy of about 50% lower.