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Steel surface largely covered with adherent millscale with little if any rust.
Rust Grade B
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Steel surface, which has begun to rust and from which the millscale has begun to flake.
Rust Grade C
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Steel surface on which the millscale has rusted away or from which it can be scraped, but with slight pitting visible under normal vision.
Rust Grade D
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Steel surface on which the millscale has rusted away and on which general pitting is visible under normal vision.
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