. Transactions . Sv*-**?*?5^ s*fs%< V «s —■ v., jgti^jAW kjfiisijijj •Wfj^-r^^^ Meteoric iron. , 20 Burnt out grate bar of cast-iron. (A.) The cast-iron unaltered by the action ofthe fire. (B.) The cast-iron changed into hard steel by the action of the fire. X 45 diameters. 74 THE MICROSCOPIC STRUCTURE OF IRON AND STEEL. furrows of Fig. 3 will be seen to be replaced by irregular cavities inthe cross section. Figs. 5 and 6 show, respectively, a longitudinal and a cross-sectionof a bolt made of Clapp & Griffiths steel. The difference in struc-ture between iron and stee
. Transactions . Sv*-**?*?5^ s*fs%< V «s —■ v., jgti^jAW kjfiisijijj •Wfj^-r^^^ Meteoric iron. , 20 Burnt out grate bar of cast-iron. (A.) The cast-iron unaltered by the action ofthe fire. (B.) The cast-iron changed into hard steel by the action of the fire. X 45 diameters. 74 THE MICROSCOPIC STRUCTURE OF IRON AND STEEL. furrows of Fig. 3 will be seen to be replaced by irregular cavities inthe cross section. Figs. 5 and 6 show, respectively, a longitudinal and a cross-sectionof a bolt made of Clapp & Griffiths steel. The difference in struc-ture between iron and steel can be readily seen in this case, the lattershowing a fibrous and yet finely granular structure, characteristic ofsteel. Hard or tool-steel presents a structure entirely different from anyof the preceding. It is highly crystalline, uniform in structure, andshows no lines of weakness or any tendency in the crystals todevelop themselves in any given direction. Fig. 7 is a high-gradecrucible tool-steel magnified 45 diameters. Fig. 8 is the usual grade of file-steel magnified to the samedegree. The latter differs from
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
