Patent ID: 8900372

Claim:
A method of cryogenic removal of contaminants from a sucker rod, the method comprising the steps of: a) obtaining a sucker rod with contaminants; b) removing said contaminants from the sucker rod by delivering a cryogenic liquid to a surface of the sucker rod, the cryogenic liquid selected from a group consisting of: liquid nitrogen, liquid oxygen, liquid hydrogen, liquid helium, liquid neon, liquid argon, liquid krypton and liquid xenon, wherein said contaminants are removed from the sucker rod by: i) thermal shock that weakens the contaminants by dropping a temperature of the contaminants; or ii) thermal-kinetic energy that causes vapor to form from evaporation of the cryogenic liquid, wherein the vapor expands and causes micro explosions which remove the contaminants; or iii) combinations thereof; c) heating the sucker rod until the rod is able to undergo plastic deformation; d) shaping the sucker rod; and e) after step d), subjecting the sucker rod to shot peening.