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Full text of "Metallurgy Of Cast Iron"

COMPILATION   OF   THE   A.   F.   A.   TESTS,   ETC.
569
scrap, and odds and ends of light junk scrap, melted in a cupola. The iron was intended for such work as locks, light hardware, and novelty castings, which includes light electrical supplies. The fluidity strips ran up full, and the chill test pieces showed only a slight evidence of a chilling effect beyond the closing up of the grain.
TABLE L-I25.—TESTS OF GUN IRON.
Transverse tests of unfinished green sand bars.				Transverse tests of finished green sand bars.*				Tensile tests of unfinished and finished green sand bars.		
V	,.	fafl	d	to	;J	bfl	a-	Is	^	bfl
*j			•2	iJ	-M		.2	jy		c
*o	tu fi	S'g	OJ	13	s	S'S	w	'o	s	I'*'
d	rt	<uj2	<U	d	o3	s^	CU	d	.2	<u5
	Q	«	Q	&	Q	«	Q		P	«
203	•57	520	.24	209	•56	460	•35	216	•57	8,740
204	1.14	3,470	•*7	2  O	1. 13	3,260	•31	1     217	i -15	30,460
205	1.69	10,530	.15	2   I	1.69	9,710	.27	218	1.70	5i,490
206	2.18	22,550	.14	2   2	2.15	20,480	.20	219	2.27	69,950
207	2.84	43,730	.12	2 3	2.82	41,190	•19	*Fiii	ished	>ars.
208	3-40	75,460	.11	2  4	3.38	70,770	.14	220	•56	8,220
Two additional tests be-				2 5	3-95	98,640	.10	221	1.13	31,33°
yond range of machine.								222	1.69	47,000
The iron used for cast'L was a mixture of the best grades of charcoal iron, and some steel and furnace scrap iron, melted in an open-hearth steel furnace. It is a class of iron that was intended for cannon and mortars, special dies, and heavy machinery castings requiring good strength and toughness, with uniformity of texture and dense granular structure. The iron was very hot and gave a chill of about 1-16 inch thick in the face of the chill test pieces.
Table 126, next page, gives the strength per square inch and table 127 gives the analyses, both of which are fully explained on page 555.SlolrlciiKc .i! : •,»   l'fjii]-.y!v,iu;.i M.ii!« ,«!.'..   <•*'•, t«.Mii«! i v, I'it l:,l.ui>;, P,i,ll. 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-              ,| |