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Full text of "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.