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Full text of "Metallurgy Of Cast Iron"

466
METALLURGY   OF   CAST   IRON.
TABLE 95.—TRANSVERSE TESTS OF SASH WEIGHT OR WHITE   IRON.
1 d fc	Common rule measurement.	Microm't'r measurement.	Deflection.	Broke at in pounds.	Strength per square inch in pounds.
61	Rough bars. % in. square  ...	.488 in	062 in.	175	735    1,400
6->		.484 "	.060 "	1 60	683    1,280
63	'         "     ..........	.487 "	.062 "	170	717    1,360
fi1	Rough bars, i   n. square .........	.992 in.	o~o in.	,340	1,361   ......
		904 "	040 "	,725	1,341    ...
66	'          "    .....  ..	.992 "	•055 "	,365	1,386   ...
67	Rough bars. 1^6 in. diam .........	1.114 in.	050 in.	,355	1,392   ...
68 69		1.113 " 1.117 "	•055 " .050 "	,440 ,320	1,480   ... 1,346   ...
Test bars furnished by E. E. Brown & Co., Philadelphia, Pa. Tested by W. C. Cutler, at the works of Riehle Bros.' Testing Machine Co., Philadelphia, Pa., June 29th, 1894.
" white iron.'' Many castings made of white iron have been known to fly to pieces from internal contraction strains when cooling, without a jar or the least weight being placed upon them. The reason for not showing any turned bars in this test is due to the difficulty or rather the impracticability of machining such a hard metal. Bar No. 69 pulled 7,125 pounds. The fracture of all the bars is of a very pronounced crystalline white appearance, as can be seen in Fig.ioi on page 473.
TABLE96.—SUMMARY OF THE STRONGEST TESTS.
No. of bar.	Transverse Strength per square inch.	No. of bar.	Tensile Strength per square inch.	Specialties of mixtures.
12	3,686		!::37,ioo	Gun Metal.
17	2,980	i?	30,100	Chill roll.
26	2,615	26	23,270	Car wheel.
36 46	2,791 2,115 1,813	35 47 60	28,676 21,120 17,150	Heavy machinery. Light machinery. Stove plate.
68	1,480	69	7,125	Sash weight.
*This tensile test is No. i of Mr. R. A. Robertson's gun metal report,ich is characteristic ofA few of these bars were pulled for the tensile strength.hat recording the strongest mixture, seen in Table 89; the