Tests of large bridge columns. . Mayari steel Carbon steel Fig. 66.—Drilled sections of steels magnified 67 diameters. The upper edges are the partsdirectly adjacent to the drill. The micro structure shows no visible distortion present Mayari steel. Carbon steel Fig. 67.—Punched sections of steels magnified 6j diameters. The upper edges are the por-tions most severely worked from the shearing action of the punch

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