... Liande can provide sucker rods including grade C, K, D, KD, HL, HY and KH. Among them, grade ... is not susceptible to sulphuric stress cracking. Grade D sucker rod is made from fine alloy steel, ... the same size and main parameter as grade D sucker rod, but their strength is capable to ... properties of sucker rod and Pony rod. First Class Equipments Sucker Rod Plant Strict Inspection Procedure Technical ...