Drill pipe is a tool for connecting drifter bit and rock drilling in roadway engineering. Drill pipe commonly used in mine roadway engineering is hexagonal hollow steel and hollow round steel. The diameter of the inscribed circle of hexagonal hollow steel is 22mm and 25mm, and the outer diameter of hollow round steel is 32mm and 38mm. The steel brazing includes finished steel brazing and forged steel brazing. The finished steel brazing is forged according to a certain length, and then the drill bit is directly installed to drill holes. The forged steel brazing is to shear the hollow hexagonal steel according to the need, then forge the drill tail and drill head with a forging machine, and then install the drill bit to drill holes.

　　The mass production of drill steel in China has a history of nearly 50 years, and the production of modern drill tools has also experienced nearly 40 years of development. China's consumption of drill steel ranks first in the world and has stabilized at about 100,000 tons/per year in recent years. At present, there are not only large drill tools manufacturers with an annual output of more than 40,000 tons in China but also nearly 200 small drill tools manufacturers distributed all over the country. The products have adapted to the development of the modern economy in China, and meet the needs of domestic production and construction, except that a few varieties still need to be imported. As far as the production technology and technical equipment of drill tools factories are concerned, many factories have developed some special equipment and technology for drill tools production by themselves, and some factories have absorbed or imported foreign technology and equipment for drill tools production. However, there are also a lot of drill tools factories that are similar to workshop production, with relatively backward technology and equipment. Their products are sold in the market, and the good and the bad coexist, with a big gap in quality and life. This is one of the main reasons for the large consumption of drill steel in China and the waste of national resources.

　　Drill pipe accounts for a large proportion of the production of drill tools in China, accounting for more than 80% by weight. Among the drill pipes, B22 and B25 hexagonal drill pipes (commonly known as small drill pipes) account for nearly 90% of the total, while the screw-connected drill pipe and drill pipe only account for about 10%, and many of them are imported from abroad (randomly or separately).

　　The quality of drill pipe depends on many factors, such as steel grade, brazing process by heat treatment, structural design of drill pipe, the transition between different sections, size of the transition arc, and so on. Among these factors, the heat treatment of the drill pipe is the main reason for the short life or early failure of the drill pipe. Choosing the right heat treatment process for drill pipe will improve the quality and service life of drill pipe products in China, reduce consumption, and be beneficial to the improvement of social comprehensive benefits.

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