The Iron and steel magazine . ks in the same direction).It is well known, however, to-day that aluminum does not realizethe expectations formerly entertained concerning its use. Itmakes somewhat sounder steel, but it does not prevent piping;and it has been found in many instances to have the tendencyto throw a bridge of solid, sound steel over the top of the ingot,thus hiding a large, unseen cavity in the interior. 2. Addition of Thermite. — This mixture of aluminum andiron oxide gives a greater heat than aluminum alone, on accountof the extra supply of oxygen present; and its use makes theste
The Iron and steel magazine . ks in the same direction).It is well known, however, to-day that aluminum does not realizethe expectations formerly entertained concerning its use. Itmakes somewhat sounder steel, but it does not prevent piping;and it has been found in many instances to have the tendencyto throw a bridge of solid, sound steel over the top of the ingot,thus hiding a large, unseen cavity in the interior. 2. Addition of Thermite. — This mixture of aluminum andiron oxide gives a greater heat than aluminum alone, on accountof the extra supply of oxygen present; and its use makes thesteel in the mold fairly sound. But, inasmuch as the highertemperature cannot prevent the steel from solidifying first in 3io The Iron and Steel Magazine the outer layers, a pipe will nevertheless form, although it willbe somewhat smaller. 3. Use of Clay-Lined Funnels. — These, placed on the topof the molds, shorten the pipe because the steel does not chill sorapidly against the less conductive clay as against the bare
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
