Canadian foundryman (1921) . lleable Castings Associa-tion will be shown. accorded to other metals, the secrets ofwhich could not be kept. All this haschanged now, and malleable iron is in therace and holding its own. A descriptionof its characteristics, the process ofmanufacture, together with examples ofthe various uses to which it may be put,will be in order. In Fig. 1 will be seen the result of aload test on malleable iron truck wheel was supported on a shaft 6J/4inches in diameter, said shaft being sup-ported outside the wheel. The load wasapplied at the top of the wheel between
Canadian foundryman (1921) . lleable Castings Associa-tion will be shown. accorded to other metals, the secrets ofwhich could not be kept. All this haschanged now, and malleable iron is in therace and holding its own. A descriptionof its characteristics, the process ofmanufacture, together with examples ofthe various uses to which it may be put,will be in order. In Fig. 1 will be seen the result of aload test on malleable iron truck wheel was supported on a shaft 6J/4inches in diameter, said shaft being sup-ported outside the wheel. The load wasapplied at the top of the wheel betweentwo spokes. A hardwood block wasplaced between the compression head andthe wheel face. A load of 148,900 poundswas recorded before the casting yielded,when the flanges were bent and the bodyof the rim showed small cracks as shownin the illustration. What Malleable Is The process of making malleable ironcastings may be briefly outlined rs fol-lows. It consists, first, of melting in anair furnace, open hearth, or electric fur-. nace, a properly proportioned mixture ofpig iron, with sprue or scrap castingsfrom some previous heat, and possibleadditions of steel scrap. The bath is re-fined until enough silicon has been re-moved from the iron to force all of the
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
