Explanation:
All manhole steps and step bolts installed after and used in corrosive environments, shall be constructed of, or coated with, a material that will retard corrosion of the step or bolt.
As per OSHA standard 1910.268(h)(8)(i)Metal manhole ladders shall be free of structural defects and free of accident hazards such as sharp edges and burrs. The metal shall be protected against corrosion unless inherently corrosion-resistant.