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Full text of "Metallurgy Of Cast Iron"

PHYSICAL   TESTS   FOR   THE   BLAST   FURNACE,   ETC.    497
TAHLE   105.— PHYSICAL  TESTS     OF    FURNACE    IRON    TAKEN    JANUARY
18, 1896.
No. of Test,	Contraction.	Deflection.	Strength	Fluidity.	Chill.	Diam'ter of Bar.	Strength per sq. in.
L	Inch. 6-64	Inch. O.I2	Pounds. 2,300	Inches. 41A	Not taken.	Inch. 1.194	Pounds. 2,054
TABLE   IO6.—PHYSICAL TESTS OF  CUPOLA-IRON.
No. of Test.	Contraction.	Deflection.	Strength	Fluidity.	Chill.	Diam'ter ' of Bar.	Strength per sq. in.
2	Inch. 8-64	Inch. 0,08	Pounds. 3,220	Inches, 5	Not taken.	Inch, 1.242	Pounds. 1,907
TABLE   IO7. ANALYSIS OF  FURNACE-IRON.                    ANALYSIS  OF  CUPOLA-IRON.
Silicon.	Sulphur.	Silicon.	Sulphur.,
Per cent. i. 02	Per cent. 0.034	Per cent. 0.81	Per cent. 0.056
NOTK.—The number of inches given under "fluidity" in this record is directly measured on the fluidity strip, seen at S, in Figs. 121 and 122, pages 509 and 514.
The day is past for tolerating; the blind, ignorant practice which we fotindrymen followed up to about 1890 in mixing- iron. The wonder is that we ever 11 hit " what we wanted, when we consider how deceptive is the fracture of pig metal as a guide to its true " grade." I am aware that up to 1900 a little over half our founders kept up with the progress of utilizing chemistry in mixing their iron; nevertheless, I say, when the furnaceman has done his part, let the founder study to do his by calling chemistry to his aid, or else get out of the business and stop complaining about "bad iron." There is no " bad iron" in the sense some have inferred. All can be utilized in some classemen tested their own iron by remelting it in a cupola and kept a regular record of all their tests, it would have a great tendency to make many investigate thoroughly to find whether the fault was not their own before entering complaints to the furnacemen.practice, inudi   better with round bars than with square »»nis.burs..........................*fi$7 "