. Railway mechanical engineer . ^ littlewear and no cutting, but the material is not practicable forjournal box construction. With open hearth steel and thetreated malleable iron shoes, the cast iron developed con-siderable cutting of wearing surfaces. The semi-steel samples, ranging in Scleroscope hardnessfrom 38 to 70, depending on the carbon, some heat treatedand others case-hardened, were all tested with malleable ironshoes. Most of these samples were subjected to heavy cuttingon both surfaces or to excessive wear. The only exception. Pedestal Wearing Plate and the Shoe of Journal Box Meta
. Railway mechanical engineer . ^ littlewear and no cutting, but the material is not practicable forjournal box construction. With open hearth steel and thetreated malleable iron shoes, the cast iron developed con-siderable cutting of wearing surfaces. The semi-steel samples, ranging in Scleroscope hardnessfrom 38 to 70, depending on the carbon, some heat treatedand others case-hardened, were all tested with malleable ironshoes. Most of these samples were subjected to heavy cuttingon both surfaces or to excessive wear. The only exception. Pedestal Wearing Plate and the Shoe of Journal Box Metal Mountedon a Shaper to this was a sample with a deep chill which subjected themalleable iron to but slight wear. The chilled wear plate,however, was considered tcx) brittle to be available forpractical use. As originally designed the built-up pedestals were fittedwith rolled steel wear plates of axle steel. A number ofsamples of this class of material, some with the surface fin-ished and others with the surface unfinished, representing aconsiderable range of heat treatment and case-hardening,were tested with shoes of the various materials which mightpossibly be used in journal boxes. The shoes and wearplates were badly cut in all of these tests. Good results were obtained with a comparatively low car-bon open hearth steel, case-hardened, with a heat treatedchrome-vanadium steel, a tempered spring steel and heattreated electric cast steel. With the exception of the latter,however, none of these metals are practicable for use asped
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
