... . Liande can provide sucker rods including grade C, K, D, KD, HL, HY and KH. Among them, grade ... it is not susceptible to sulphuric stress cracking. Grade D sucker rod is made from fine alloy steel, ... having the same size and main parameter as grade D sucker rod, but their strength is capable to reach ... KH sucker rod are made from fine Cr-Ni-Mo alloy steel containing different amount of Ni. They possess ...