. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ntinue doing until we draw one that isred hot. Then allow the fire to run forone to five or six hours, according to sizeof the piece; work i inch or under willproperly anneal, as a rule, in one hour. ing or hammering the bar or block is stillin the steel. It has had no opportunity toget out, but by removing part of stock thestrain will be in a great measure removedby the annealing heat and greatly lessenthe liability of cracking when the piece ishardened. To properly harden steel, wemust thor
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ntinue doing until we draw one that isred hot. Then allow the fire to run forone to five or six hours, according to sizeof the piece; work i inch or under willproperly anneal, as a rule, in one hour. ing or hammering the bar or block is stillin the steel. It has had no opportunity toget out, but by removing part of stock thestrain will be in a great measure removedby the annealing heat and greatly lessenthe liability of cracking when the piece ishardened. To properly harden steel, wemust thoroughly understand annealing. As tool steel comes from the mill theoutside is not in a condition to surface is decarbonized by the actionof the oxygen in the air on the carbon inthe steel; so this surface should be re-moved to a depth sufficient to insure hard-ening. This depends on the size of thesteel bars. One-inch and under are sel-dom decarbonized more than 1-32 inch;so that removing that amount of stockgenerally insures hardening. As the barsget larger, this surface becomes lOKE (dAHlllA S R.^ II feet II 7-16 inches long. The heatingsurface is 1, square feet, and thegrate area is square feet. The en-gine is furnished with the most approvedappliances for operating and for the com-fort of the enginemen. Preparation of Steel, and Points 011Hardening. BY E. R. \M. To harden properly, the steel must bein a proper condition to harden. As the barcomes from the rolls or hammer in themills, it is full of strains, which should beremoved by careful annealing. If we areto make a tool that has the center cut in the case of a milling machine cutter,punch press die or similar tool, it is bestto remove part of the stock, leaving thehole somewhat smaller than finish size. Weshould also rough all scale on outside ofthe piece, and anneal by packing in a box or Time of heating larger pieces takes brands of
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
