*Material are developed by cooperated with National & Local Joint Engineering Laboratory for High-performance Metal Structure Materials and Advanced Manufacturing Technology to improve the fatigue resistance of drilling steel.
*Material is with strict process of steel smelting and rolling: Refining - Vacuum - Continuous casting - drilling hole method - surface peeling to control the content of non metallic inclusion and harmful element.
*Strictly control precision thread process to avoid thread too hot and broken effected by the high vibration and shaking of thread part when it works.
*Heat treatment: Fully Carburization - Air cool quenching - tempering. It make the rod keep high toughness and improve surface harness and whole strength as well.
*Thread strengthen: enhance the thread parts to improve the wear-resistance and longevity of the rod.