METHOD OF PRODUCTION OF A STEEL PIPE, METHOD OF PRODUCTION OF A STEEL PIPE FOR USE AS A DRILLING SHAFT FOR CABLE LINES, STEEL PIPE, DRILLING SHAFT AND CORE DRILLING SYSTEMS OF CABLES LINES USED IN MINING AND GEOLOGICAL EXPLORATION

摘要

steel pipe production method, steel pipe production method for use as a drill rod for cable line systems, steel pipe, drill rod, steel pipe use method, drilling systems of core cable lines used in mining and geological exploration. The embodiments of the present invention are directed to steel tube production methods which can be used for mining exploration and to rods produced therein. embodiments of the methods include tempering steel tubes from an austenitic temperature prior to cold drawing thereby improving mechanical properties within the steel tube such as conventional limits of elasticity, impact toughness, hardness and abrasion resistance. embodiments of the methods reduce the tempering and quenching step of a steel pipe to compensate for wall thinning during tapping operations. The method modalities also narrow dimensional tolerances and reduce residual stresses within the steel tubes.