. American engineer . of the 1)ox with 1 in. of the carbonizing material, then placethe work to be hardened 1 in. from the ends and sides of thel)ox, and /■ in. between pieces; cover this with 1 in. of carbon-izing material, and place the lid on the box. The length of timere(inired in case hardening is regulated by the depth of the cas-ing desired and the size of the pieces. At the close of the car-bonizing period the box should be allowed to cool with thework undisturbed until cold; then remove the work from thebox and reheat it slowly to from 1,450 to 1,472 degs. F. andquench in cold water,
. American engineer . of the 1)ox with 1 in. of the carbonizing material, then placethe work to be hardened 1 in. from the ends and sides of thel)ox, and /■ in. between pieces; cover this with 1 in. of carbon-izing material, and place the lid on the box. The length of timere(inired in case hardening is regulated by the depth of the cas-ing desired and the size of the pieces. At the close of the car-bonizing period the box should be allowed to cool with thework undisturbed until cold; then remove the work from thebox and reheat it slowly to from 1,450 to 1,472 degs. F. andquench in cold water, oil or brine, as the hardness requires. C. A. Scnsenbach (Penna., Sunbury, Pa.):—The factors gov-erning case hardening are equipment, temperature, time, and thenature of material. I have placed equipment first, as I do notl)elieve it is possible to get good results with a slip-shod equip-ment. Good results cannot be obtained unless the temperatureis even. If the temperature is allowed to go below deg. Heighf
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
