ステンレス鋼の鱗状かぶさり疵(ゴールド・ダスト疵)の発生機構と素材熱延板表面性状の影響

概要

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A study was made of mechanism and causes of minute scale-like defects on bright annealed stainless steel sheets named as gold dust defects which frequently became to be initiating points of rust corrosion. The gold dust defects were microscopical overlapped surface with peeled foil like as scale, originated from the convex sites on the material uneven surface being pushed over into neighbor concave valley by cold rolling. Sheets having coarse surface or intergranular corroded surface were given for example as the uneven surface. It was considered that the gold dust defects were formed by overlapping mainly to tail direction during cold rolling where the elongation length was smaller than the thickness reduction by cold rolling. It was found that the gold dust defects were not detected practically on the surface of material sheet having roughness under 25.0μm in H_<max> and having the corroded grain-boundary of line, step or V-groove shaped type. Brushing of material surface with crushing the convex sites without elongation, and heavy grinding or polishing were also found to be causes of gold dust defects.
社団法人日本鉄鋼協会の論文
1988-06-01