. American engineer . 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 th
. American engineer . 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 To Suit Conditions. Furnace and Air Cooling Chamber for Hardening High Speed Steei Cutters; Loulsvilie & Nashville. that is not uniform. If the heat is too low, satisfactory car-bonization cannot take place. R. £. Cronier (Atlantic Coast Line, Montgomery, Ala.) :—Incase hardening I have for the past 12 or 14 years used car-bonated lione with prussiate of potash next to the work whenI pack the box. I like a wrought box as it is a little lighter tohandle, heats through quicker, and will stand more heat thana cast box. I generally burn from 12 to 16 hours, and alwaystake a test piece of J-4 inch or J^ inch round and have 1-16 inchor 3-64 inch on test, which will give me about 1-16 inch or 3-32inch on an ordinary size link or block which I think very have only a draft furnace for spring work and I do my casehardening in it. I generally pack my own box and see it putin the furnace, and see that red heat is kept on the box if pos-sible. I dip in a clean water bath with wire nett
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
