Carr Lane heat treats products through processes including Carburizing and Through Hardening, and tests these processes through the Rockwell Hardness Test and Vickers Hardness Test. Virtually all Carr Lane Mfg. steel products receive a Black Oxide finish as the final step in the production process to give these products mild corrosion resistance. Other products receive passivation, Physical Vapor Deposition, Zinc Plating and Electroless Nickel Plating during the manufacturing process adding little thickness while improving product consistency and slipperiness. Learn more about Carr Lane finishes below.