395
NICKEL STEEL.
Tests Made for the Bureau of Ordnance, U. S. Navy.
No. 7293.
Marks, 3" round nickel steel. Carbon Steel Company. Diameter, ".500.
:Sectional area, .196 square inch.
Gauged length, 2".
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.	Remarks.
Pounds.	Inch.	Inch.	Inch.	Inch.	
1,000	0.	0.	0.	0.	Initial load
5,000 10,000 20,000	.00010 .00030 .00060	.00010 .00020 .00030	0.	0.	
30.000 40.000 48.000 49.000 50.000 51.000 52.000 54.000 80,510	. 00100 . 00130 .00150 .01100 . 01365 . 01450 . 01560 . 01750	.00040 .00030 .00020 . 00950 . 00265 . 00085 .00110 .00190	6.	0.	Elastic limit. Tensile strength.
General summary.
pounds.. 80,510 ....do... 48,000 ...inch.. .2550 ....do... .00150
____do...	.150
.......... 50.9
. ", 75 from neck ......fine silky
*36 .״ ,15.".....
Tensile strength per square inch of original section...
Elastic limit per square inch of original section......
Elongation per inch after rupture..........................
Elongation per inch under strain at elastic limit......
Reduction in diameter at point of rupture..............
Reduction in area after rupture, per cent of original section
Position of rupture....................................
Character of broken surface........................ ..
Elongation of inch sections............................