... products and production capacity: 1,Sucker rod 12 million m / year2,Drill Collar 10000pcs/year3,Drill pipe 20, ... . Liande can provide sucker rods including grade C, K, D, KD, HL, HY and KH. Among them, grade ... C, K, D sucker rods are designed and manufactured according to the ... it is not susceptible to sulphuric stress cracking. Grade D sucker rod is made from fine alloy steel, ...