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Full text of "Metallurgy Of Cast Iron"

562
METALLURGY   OF   CAST   IRON.
The Iron used for cast B was soft enough, to machine readily in sections little more than ^ inch thick. A mixture of coke and charcoal pig iron, with about 40 per cent, of scrap, was used and melted in a cupola. The fluidity strips ran up nearly full. The chilled test pieces gave a chill of about 1-16 inch thick, as seen in Fig. 146, page 561. This cast was made under the supervision of Mr. Jos. McDonald.
TABLE C-IIJ.—TESTS    OF   LIGHT   MACHINERY   IRON   CAST   AT   WESTING-HOUSE ELECTRIC & MFG.  gO., PITTSBURG, PA.
Transverse tests of unfinished green sand bars.				Transverse tests of finished green sand bars.*				Tensile tests of unfinished and finished green sand bars.		
C-M o  . g!	~ t-I «£ 5*	fcfl •3? £§ W~	o   . <U M <g.§ p^	13 °!	5 Z> •gjj	be 3-g ^0 Pq-	6  . O  n SI	•8 . |1 f-t	c ^' S^ p"	bJ3 ll CQ^
45	.56	345	.155	53	•56	320	.305	60	•57	4,740
46	1.14	2,320	.119 .085	54	1-13	2,235 6,780	_i!3Q_ .112	61	1.13	15,860 32,020
47	i-75	6,940		55	1.69 2.15			62	_L7£_ _^£L ished	
48	2.27	16,330	.079	_56_ 57		12,495	.096 .085	63		48,230
49	2.84	31,030	.088		2.82	26,965		*Fin		)ars.
5°	3-43	50,200	.074	58	3.38	43, 150	.086	64 65	.56 1-13	__li34°. 14,99°
5i	3.98	72,180	.067	"  59	3-95	72,695	_i?7_5_			
52	4-63	104,470	.044					66	1.69	26,030
Compression tests from bars in the above Table 117, cast in dry sand, showed a J^-inch cube cut from a rough ^-inch square bar to crush at 38,500 pounds, and a ^ -inch cube from the center of a i -inch square bar at 24,890 pounds; from the center of a 2-inch square bar, 18,010 pounds; 3-inch square, 15,950, and a 4-inch square, 14,220 pounds.
The iron used for cast C was of a character to run into 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-              ,| |