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Rust Grades A B C D

Updated: Feb 25, 2023

Rust Grades


A Grade: Steel surface is completely covered with adhering mill scale & little if any rust.

B Grade: Steel surface starting to rust & from which the mill scale has begun to flake.

C Grade: Surface where mill scale is rusted or can be scraped off, little pitting is visible to naked eye.

D Grade: Steel surface with rusted mill scale, significant pitting corrosion visible to the naked eye.







Steel Grade AIt is almost entirely covered with mill scale, has little rust or oxidation & is free of pitting corrosion.









Steel Grade B Steel exposed to the elements shows signs of surface rust, but high levels of mill scale remain.











Steel Grade CWeather-beaten steel, it is rusting, Little or no mill scale remains & has been scraped off the surface. The pitting is clearly starting.










Steel Grade DSteel that has been weathered for a long time. You can see pitting and rust inclusions. Extended surface oxidation leaves no mill scale.





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