Methods of manufacturing steel tubes for drilling rods with improved mechanical properties, and rods made by the same

摘要

Embodiments of the present disclosure are directed to methods of manufacturing steel tubes that can be used for mining exploration, and rods made by the same. Embodiments of the methods include a quenching of steel tubes from an austenitic temperature prior to a cold drawing, thereby increasing mechanical properties within the steel tube, such as yield strength, impact toughness, hardness, and abrasion resistance. Embodiments of the methods reduce the manufacturing step of quenching and tempering ends of a steel tube to compensate for wall thinning during threading operations. Embodiments of the methods also tighten dimensional tolerances and reduce residual stresses within steel tubes. 102 104 106 Steel Making Piercing and Hot and Roling. Or Hot First Cold Continuous Roling and Drawing Casting Welding Process 112 110 108 Final Cold . First Heat Drawing Treatment 1:14 116 118 NonFinal Heat Nn Straightening Finalmeat destructive TreatmentTetn Testing Figure 1