Metallurgy Of Cast Iron

COMPARATIVE FUSIBILITY OF FOUNDRY METALS. 341
TAHLE 76.—CHEMICAL ANALYSIS OF GRAY CAST IRON AND Gl'KN HKARTll STKKl. UK-MELTS GIVEN IN TABLE 75, OI'l'OSITE PAUK.
1 i
1 Analysis Analysis of
of metal metals
Ht-at Norf. 2 r 22 23 i obtained charged in
1 troni the heats Xos.
| 23 d heat. 24 to 2b.
1 ^ "cu o> ! 'J ' *U ^ . ! 1»
o I* A 2 ,c R 4: .£ C
•Kind of Metal Charged. rt o IH § 1 cS <u "5! rt i ! " 33 *£
g 1 Cj' 1_ s ! 4, i ^ g R 1 g 3 b 5
O 0 O 0 C 1 O 1 O 3 C j C
Analysis letter I, M N O p o R vS T I U
Total carbon... 4.02 .ho 1.48 2.74 4. bo 3.05 4.20 .70
Graphitic
carbon 2.90 3-30 -ID 3-03 trace
Combined
carbon 1. 12 .60 1.48 2.74 1.30 2.QO 1.17 .70
Silicon — 1.72 • 31 .26 .14 l-!5 •35 1.24 -3^
Sulphur.. •03 .026 .10 .14 .10 .18 .05 .12
Manganese •35 -34 • 23 •J5 .23 .06 .40 •5^
Phosphorus .. •073 .106 .167 .IQOl .103 . K)S : .OC)2 .116
The effect of remelting upon the silicon, sulphur, manganese, and phosphorus is well shown in Tables 73, 74, and 76. We find the results are all in line with the varied experience of those who have kept close watch of remelts, to the effect that silicon and manganese decrease while sulphur and phosphorus increase. It may cause some surprise that more silicon was not lost or sulphur added than shown by the four continuous remelts in heats Nos. 9, 10, n, and 12, Table 73. The author accounts for this in that the metal was held in the cupola but a short time, compared to that generally occupied in ordinary shop practice. The longer heated or semi-molten iron remains in contact with incandescent fuel or is exposed to gases, the more sulphur will be absorbed — up to the limit of the iron'sding its mate.. 2111 3Os i m. mi 3os 3OS. 3111. im ^os Jill l^S i in.