... . Liande can provide sucker rods including grade C, K, D, KD, HL, HY and KH. Among them, grade ... 11 B, grade KD, HL and HY according to SY/T5029-2006 standard, and grade KH according to company ... 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 ...