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Full text of "Metallurgy Of Cast Iron"

MIXTURES   FOR   CHILL   ROLLS,    CAR   WHEELS,    ETC.      267
can deteriorate the metal and often leave it no better than cupola iron. For sand roll-mixtures, see page 273-
TABLE  44—ANALYSIS  OF  TWO   ROLLS  THAT  STOOD   WELL. BY PROF. A. LEDEBUR.
	Roll i.	Roll 2.
Hardening1 Carbon .............. . ...........	0.58	0.45
Carbide Carbon ........         .              ......	2 43	o 46
Graphite and Temper Carbon .....................................	0.19	1-93
		
Total Carbon .... ............................................ . __	i> 20	2 84
Silicon                      ......................................	o 83	o 80
Manganese .....................................................................	0.15	0.16
Phosphorus                            .....................	0.88	0.88
Sulphur                     . . .        ...................	O 10	0 IO
		
The main difference between mixtures for chilled rolls and car wheels lies in coke iron being used in mixture with charcoal iron — or alone, for the latter — and the iron being melted in a cupola instead of an air furnace. A few have used steel scrap in mixture with pig iron for car wheels, but in such cases great care has to be exercised to procure a uniform product of steel. The more general practice is to depend upon pig iron that has been melted in a small cupola to test it physically as well as chemically before it is used in the regular cupola, where it may be mixed with old car wheels and shop scrap. The following Table 45, taken from an excellent paper on " The Manufacture of Car Wheels " by Mr. G. R. Henderson before the American Society of Mechanical Engineers, Washington, May, 1899, presents the analyses of seven wheels which had given from eight to eleven years of service. An analysis ot a good wheel by Mr. A. Whitney is also given in Table 46.sly the same depth.... Shop scrap     ......	15            x ro           x	1.50 i. So	22.50 iS.oo