How Come, Hoe Long - Various - Pottþétt Ást 3 (CD)

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Doutaur says:
Variations in structure from center to surface, Distribution of nonmetallic impurities across the sec-tion, Decarburization at the surface of a ferrous material (see Test Method E ), Depth of surface imperfections, Depth of corrosion, Thickness of protective coatings, and Structure of protective.

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