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Full text of "Metallurgy Of Cast Iron"

Al E T A JL 1. I   hi ( T Y
'v.. AM     I K < J IN .
Iron of the analysis shown in gun metal can, in castings three inches thick and over, be readily machined and with greater ease than that composing the chill roll mixture. Next in hardness to the roll iron is the car wheel metal, the other specialties following in degrees of softness in the order shown, until sash weight iron is reached, which specialty excels all shown for being a hard metal as such is strictty a " white iron." The following Table is a summary of the best strength obtained from a series of about 100 tests taken with bars one and one-eighth inches in diameter, twelve inches between supports, in obtaining the transverse strength, more fully described in Chapter LX. A column is also given showing the tensile strength of all these specialties.
TABLE   6l.—SUMMARY   OK   TYPICAL   AMERICAN   FOUNDRY   IRON   TESTS. Taken with one square inch area test bars.
Specialties of Mixtures.	Transverse strength per square inch.	Tensile strength per square inch.
Gun Metal              .....                                       .....	3 686	37 no
Chill Roll	3 044	30 661
Car Wheel.              ..................................	2 819	25,782
Heavy Machinery                                                   . .	2 791	25 799
Light Machinery  .   ..        ..........................	2,1 15	20 655
Stove Plate	I 813	12 ^82
Sash Weight    ..................................................	1,480	7,044
		
The Table 61 is no discredit to American foundry-men. It displays to the world typical irons challenging competition in excellence for the various specialties shown.
Ductile cast iron is the term applied to a product that is manufactured by the East Chicago Foundry Co., for which a tensile strength of 50,000 to 60,000 pounds per square inch is claimed. The author has endeav-give a softer re-melt than gray parts of the same casting, see pages 338 and 339.