 A Grade - A steel surface is completely covered with staying mil scale and little if any rust.

 B Grade - A steel surface starting to rust and from which the mil scale has begun to piece.

 C Grade - A steel surface where mil scale is rusted or can be scratched off, but little pitting is observable to the independent eye. laser paint remover

 D Grade - A steel surface with rusted mil scale, basic pitting disintegration recognizable to the independent eye.

Steel Grade A - It is basically covered with mil scale, has insignificant rust or oxidation, and is freed from pitting disintegration.

Steel Grade B - Steel introduced to the parts gives signs of surface rust, but raised levels of mil scale remain.

Steel Grade C - Environment beaten steel, it is rusting, Essentially no mil scale remains and has been scratched off the surface. The pitting is clearly starting.

Steel Grade D - Steel that has been persevered for a really long time. You can see pitting and rust contemplations. Extended surface oxidation leaves no mil scale.

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