The Metallography And Heat Treatment of Iron And Steel
The Metallography And Heat Treatment of Iron And Steel
Albert Sauveur
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Digitized by Google CHAPTER IX — IMPURITIES IN STEEL 151 MnS can generally be readily distinguished from other inclusions because of its characteristic dove gray color, its globular shape in castings (Fig. 156) and, owing to its plasticity, the ease with which it is elongated in forgings (Fig. 157). It seems reasonable to assume that the paler its color the greater its purity, and that a yellowish tint points to the presence of some FeS. Pure FeS, a very rare constituent of steel, has a decided...ly yellow color and is more brittle. MnS generally occurs in the free fer- rite of hypo-eutectoid steel, between the pearlite grains of eutectoid steel or in the free cementite of hyper-eutectoid steel. Silicates are decidedly darker than MnS (Figs. 159 and 160) which affords a means of distinguishing between them even when they are associated in the same particles as it sometimes happens (Fig. 159). Silicates because of their relative brittleness are Fig. 159. — Manganese sulphide (light constituent) and manganese sili- cate in steel.
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