High strength sucker rod

The basic structure and working principle of high-strength sucker rod are not fundamentally different from ordinary sucker rod. However, compared with common grade D sucker rod, high strength sucker rod shows new tensile strength grade, with higher performance index and higher bearing capacity. When the minimum stress is 0-102mpa, the allowable stress value exceeds grade D sucker rod by more than 35%.

There are two types of ultra-high strength sucker rods in China. The first one is HL with a tensile strength of 966-1195mpa,that means the sucker rod whose performance is improved to the super strength level by selecting appropriate materials is a material type ultra-high strength sucker rod. The second one is HY. HY level is developed and manufactured on the basis of HL level process. After the sucker rod is selected by special flaw detection equipment, it is further processed by ultra-audio frequency induction heating quenching process. There is a hardened layer on the surface of this rod. After shot blasting, it will have high tensile property and surface hardness. At the same time, it also has high fatigue strength and fracture resistance due to the residual stress on the surface. The sucker rod whose performance is improved to the super strength level is a process type ultra-high strength sucker rod and the tensile strength is 1150-1360mpa.