Patenting is an application of isothermal annealing employed to coiled ropes to achieve better properties. Normally this type of treatment is employed to steel with carbon above 0.45%. This contains a fairly high amount of carbide in it. To prevent carbide formation, the material is held just at the nose, and then from thair air cooling is carried out. This air cooling results in partial bainitic and partial pearlitic microstructure. Details of the process will be discussed in upcoming articles.