Steel Sucker Rod for Grade C, D, and K are designed and manufactured in accordance with API Spec 11B latest version. They are also meet the SY/T5029 industry standard of China.

Grade C sucker rod is made of fine carbon-steel or alloy steel. It is featured by moderate strength, good plasticity and better corrosion-resistance. Grade C sucker rod is suitable for the weaker sour medium environment where they are not susceptible to sulphurated stress cracking.

Grade D sucker rod is made of fine alloy steel. It is featured by high strength, better plasticity and long service life after heat treatment. Grade D sucker rod is suitable for the deeper oil-well in the non-corrosion or light-corrosion medium.

Grade K sucker rod is made of fine alloy steel contained more nickel element. It is featured by moderate strength, good plasticity and excellent corrosion-resistance. Grade K sucker rod is suitable for the shallower oil-well in the heavy-corrosion medium.