. Canadian foundryman (1921). find asource of supply especially adapted tothe making of the particular class ofwork he requires and many of the largerplants are equally well able to handleany of the types of work mentionedabove. Malleable iron is more costly—poundfor pound—than grey iron, but becauseof its strength and power to resist shock much lighter malleable casting may be CANADIAN FOUNDRYMAN 29 ance and its very slight variation fromthe pattern that the malleable castinghas been demanded in such large ton-nages by the automotive industry. It is especially adapted for use in theconstructi
. Canadian foundryman (1921). find asource of supply especially adapted tothe making of the particular class ofwork he requires and many of the largerplants are equally well able to handleany of the types of work mentionedabove. Malleable iron is more costly—poundfor pound—than grey iron, but becauseof its strength and power to resist shock much lighter malleable casting may be CANADIAN FOUNDRYMAN 29 ance and its very slight variation fromthe pattern that the malleable castinghas been demanded in such large ton-nages by the automotive industry. It is especially adapted for use in theconstruction of the pleasure car, thetruck and the tractor because of itsstrength, its freedom from excessiveweight and its ability to withstand snockand vibration. It has for these reasonsin many cases displaced the steel cast-ing and the forging in this work. Illus-trations of this type of casting areshown. Below is given a summary of certainphysical qualities of malleable ironwhich have been determined and verifiedby experiment:. FIG. 10—MALLEABLE HARNESS PART BURIED IN THE GROUND FORFORTY YEARS. sed for a given purpose than would beafe or even possible were the castingf grey iron. Hence the malleable ironasting for a given use is generallyheaper. This in addition to the factlat a great deal of weight is saved ex-lains in a measure why malleable ironas displaced grey iron in many cases ofgricultural implement and car con-duction. The same reasoning applies generallyl a comparison of malleable iron andteel castings. Malleable iron may beoured in lighter sections than steelhere weight is a serious drawback and>r the same reason it is possible toake castings of malleable iron whichle steel foundryman would not appearance the malleable iron cast-g is as smooth, as clean and as true toittern as grey iron, while, due partlyi its lower pouring temperature andirtly to the moulding practice em-oyed in the malleable foundries, itslish is far more attractive and truer outline
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
