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Full text of "Metallurgy Of Cast Iron"

3!4
MRTALLUKOV   OF   CAST
and sand-cast pig; metals to judge whether scale or sand prevents a loss of iron by oxidation. For heats Nos. 3> 4> 5> 6, 7: anc"i *> aU chilled irons were used, the only difference being that I used different materials for coating or protecting the surface of the chill, or sand-less pig rolls, which were to be charged as protected irons. Of the three coatings used — lead wash wet with molasses water, lime wash which was hardened with salt, and silicate of soda — the lead wash afforded the best protection. This was proven by the less time required by unprotected chills to start and end in melting than the chill or sandless pig rolls having their surfaces protected or coated with the lead wash.
Believing an immersion  test would furnish a good check on the action of the different protectors--lead,
TABLE   66.----COMPARATIVE    OXIDATION     TKST     OF     STOVK     PLATE    AND
IIKAVY   IRON.     SK.K   PACK   316.
Heal	Heat	Heat	Heat
No.   I.v	No. n.	No.  15.	No. i<i.
"j	••j	4j	a,--
j2 ./	~ •/:	rt   .	^ .^
Kind of metal eharged.                          "3	s.3	*^"^	?3
1          i;			o **
i             >w	'< s	.S'2	
i      % ^	•7; c'	;/„ 5	-.'-t rt
Weight of charge eacltside               .         nmlbs.	»»s n»s	IIHI Ibs	6^ Ibs
Blast on .....                                           ..'    i       s- vl ~			^ 1 1
Heavy iron running    ..........                    ^ V1 •	.vU»	.',.'S '	
Plate running ...........................    •        v v-i'.-	' •* "•*'	3 , .1,	^ IS
Heavy iron alt down ......... ,. ........ ;        ,-,,5.1	,v.'I	'     -'..xS	"i.22tt
Plate all down                        ....        ........          3. .11	3-»3	.'•.•W	3-21
Weight of heavy iron obtained. .........        >>f> Ibs.	'..; Ibs.	«»7 Ibs.	r>3 Ibs.
!     I.S o/,.	I I   O/.	,t o/.	I  O/.
Weight of plate obtained.        .           ,      '    S<> Ibs,	sy Ibs	<jl Ibs	f»i Ibs
I      1 1 <>'/..	</ o/.	r> ">'••	I I   O/..
XyOj-s of heavv iron.                                      ,      ^ Ibs.	• n>s	' Ibs	i ii>
	5 <>/.	1.1 o/..	15 ox.
Ivoss of plate ....... ..............                        in Ibs.	7 Ibs	<S Ibs.	H Ibs
	7 o/..	I I   O/.	5 o^.