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Full text of "Metallurgy Of Cast Iron"

564
METALLURGY   OF   CAST   IRON".
was merely perceptible, as shown in Fig*. 147, page 563, This cast was made under the supervision of Mr. Benj. D. Fuller.
TABLES D & E-IlS.—TESTS OF CHILLED   AND   SAND   ROLL IRON   CAST  AT SEAMEN,  SLEETH ROLL CO.,  P1TTSBURG,   PA.
Transverse test of unfinished green sand bars in cast D.					Transverse tests of unfinished green sand bars in cast LC.				
tj	»H'	bfl	O	U	11	QJ	bo	d o	.2
'o	11	31 rt O	1	a	"o	OJ	•2 3 ca o	%	2
c	rt			o	c	rt		(L)	g
	P	P5		tj	£	P	PP	0	<-•
67	•54	280	.225		75	•57	480	.280	
8	1.14	2,460	.280		76	1.12	2,310	.215	.17
•-')	1.74	ll,88o	.270		77	1.73	7,100	.180	
0	2.27	25,130	.248	.15	78	2.23	20,650	.190	. 6
i	2-79	48,650	.220	.14	79	2-93	44,200	.180	. 5
2	3-39	84,200	.200	.12	80	3.26	61,800	. 190	• 4
3	3-94	126,360	.170	.12	8 1	3-92	99,280	.180	. 3
74	4.50	201,020	.160	. I I      |           82		4.33      |   128,980		.150	.   2
The iron for cast D was used for heavy chilled rolls, made from a mixture of cold blast charcoal pig iron melted in an air furnace. Transverse bars were cast only, for the D and E casts, as no data of commercial value could be obtained from tensile tests owing to the metal being all white in the sections falling within the scope- of ordinary testing machines; in fact, the fractures of the chill test pieces of the pattern shown in Figs. 145 to 147 were white all the way through. The fluidity strips ran up full, showing good hot iron. The contraction ranged from . 28 in the ^2-inch bar down to .11 in the 4-inch bar. The smaller bars of the D and E cast were tested by the Pittsburg Testing Laboratory, and the heavy ones by the Riehle Brothers Testing Machine Co., Philadelphia, Pa.nto very thin sections, and yet be soft enough to machine readily. About 40 per cent, scrap was used in a mixture of coke and charcoal pig iron, melted in a cupola. The fluidity strips ran up full. The chilland j^reen sand  showedast on end, us such will tfive truer results than the [J4™inch round bar in general practice, especially in making comparison <>i; the widest ranges in grades.temper '' or damp-              ,| |