... provide sucker rods including grade C, K, D, KD, HL, HY and KH. Among them, grade C, K, D ... according to the API Spec 11 B, grade KD, HL and HY according to SY/T5029-2006 standard, and ... corrosion or light-corrosion environment oil-well widely. Grade HL and HY sucker rods are super-high strength sucker ... their strength is capable to reach 966~1195Mpa. Grade HL, HY sucker rods are suitable for the deep oil- ...