Metallurgy Of Cast Iron

COMPARATIVE FUSIBILITY OF FOUNDRY METALS. 335
TABLE 73.—CHEMICAL ANALYSIS AND SPECIFIC GRAVITY OF GRAY AND CHILLED IRONS RAN FROM HEATS SHOWN IN TABLE 72.
Heat Nos, 9 IO II 12 Analysis of Castings obtained from the i2th heat.
Kind of metal charged. i &<> I-P •0,23 II £.2 'jS'o art *X% §o.2 $rt« _ (f. M" 13 = art« 'd.S 33 cert H-2 ".H'O art •d« II T~I J£ is? art •a« II "jE-'o art K 4-70 0.03 4.67 •57
Analysis letter ..... A B c *D *3 F G H I J
Total Carbon . 3-94 4.10 4.06 4-30 J^3_o_ 2.68 4-47 4.40 4.68 4.62 4.76 -LIl 1. 60
Graphitic Carbon... 3.06 2.90 o. 16 2.42 2.90 O.2O 2.67 o.oo
Combined Carbon . .88 1.20 3.90 1.98 1.62 1-5; 4.20 2.OI 4.62
Silicon. ... .82 •75 •75 .63 .68 .66 •63 •57 •56 •59
Sulphur.... .02 •03 • 03 .04 •035 -°4 .04 •°45 .046 .048 .044 .22 .266 7-79
Manganese .78 .66 .66 •53 •54 •31 •33 .18 .19 .25
Phosphorus. . -232 .248 .240 .274 .285 • 237 •254 •254 .250 .271
Specific Gravity... 7-.o i 7.30 7.6r 7-35 7.40 7.70 7-47 7.76 746
hole, the metal being poured into sand and chill moulds from one ladle. For heat No. 10 the sand and chill rolls from heat No. 9 were charged in their respective sides and the two tap holes used. The iron as it ran from this heat through open tap holes dropped into sand moulds, one being set under each tap hole, to give a block of iron from each side about six inches diameter by six inches high. This tenth heat had both sides run into sand moulds for the purpose of learning which would be the harder iron when remelted, that which had been chilled or that which had not. Heat No. ii melted down the gray blocks obtained from heat No. 10, and this iron was again run into sand and chill moulds. Heat No. 12 was a remelt of the sand and chill rolls obtained from heat No. n, and was the
*The analyses D and K of the grey blocks coming from the sand and chilled rolls cast in heat No. 10 and melted down in heat No. 11 is also shown at A2 and 132, Table 74, page 336.Hard. Hard. Hard. Hard. Hard. Hard. Hard.