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Full text of "Metallurgy Of Cast Iron"

340
METALLURGY   OF   CAST   IRON.
seen in Table 73, page 335, which, in four successive remelts, raised the density of the gray iron from 7.01 to 7.46, an increase of .45 in density, and in the chilled iron to 7.79, an increase of .78 from the original pig, showing that successive remelts greatly increase the density of irons. Another point to be, noticed is that the chilled iron differs about .30 in density from the gray iron in the respective heats shown. For a comparison of the specific gravity of other metals with cast iron, see Table 136, page 593,
TABLE   75.—COMPARATIVE FUSION  TEST  OF  CAST IRON   WITH  OPEN HEARTH   STEEL.
Heat Nos.	21	22	23	24	25	26	27	28
	^	^ a"				^	j	s £
Kind, Weight	|I|	g'^o		S- o	d.s G	Z~£	§^S	0       O
and Form of	""" GJ i.j		• r-    dJ	""  OJ	.«   QJ	.«   OJ	^^	
Metal Charged Bach Side.	O w o I'-gl	O t/Jo tn   5	° two	J«?S	Ml	°. w §*		Ml
	%«	ff°	«   ^	M ea	^.Cd	Jo^	003	%rt
•Blast put on .....	8:56	2:50	3^0	11:30	3:23	0:37	11:29	3:26
Steel running..	9:09^	2:59^	S^S	11:41^	3:32	0:45%	11:385^	3:32
Iron running...	9:06^	2:58	3^4	11:38	3:30^	0:45	Ii:36^	3:32^
Steel all down.	9:21	3:08	3:"1/	11:51	3:41^	0:58^	11:49%	
Iron all down..	9:17^	3:05^	3:10	11:48	3:40	0:58	1 1 '49	
Iron  exceeded								
steel in start-								
ing ...............	3m-	im. 303.	i in.	3m. 153.	i m. 303.	453.	im. 303.	155.
Iron   exceeded								
steel   in   fin-								
ishing ...........	3111. 308.	2tn. 3os.	im. 153.	3ni.	im. 158.	308.	45S.	
Chemical changes due to remelting iron. In a study of Table No. 73 we are first struck by the increase of total carbon. We find that starting with the original pig containing 3.94 carbon, four re-melts increased it to 4.76, an increase of nearly one per cent. It is to be noted that in all cases the sand or gray rolls show more carbon than the chilled roll. specific gravity'tests make rolls that were used for heat No. 18,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.