NICKEL STEEL.
398
Tests Made eoe U. S. Navy, Gun Factory, ’Washington , D. C.
Specimens taken from If" round bars furnished by the Carbon Steel Company.
No. 7384.
Marks, 1.
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. 1,000 5,000 10,000 20,000 30.000 40.000 50.000	Inch. 0. .00010 . 00030	Inch. 0. .00010	Inch. 0. 0.	Inch. 0. 0.	Initial load.
	. 00065	.00035			
	.00100	.00035			
	.00135 .00160	.00035 .00025	0.	0.	
52.000 53.000 54.000 55.000 56.000 58.000 60.000 64.000 68.000 72.000 76.000 80.000 93,370	.00180	. 00020			Elastic limit.
	.00205	.00025			
	.00325	.00120			
	. 00460	.00135			
	.00595	.00135			
	.00700	.00105			
	.00875	.00175			
	.01200	.00325			
	. 01575	.00375			
	.01950	.00325			
	. 02400	.00450		*	
	.03000	.00600			
					Tensile strength.
					
General summary.
......................pounds..	93,370
.........................do...	52,000
........................inch..	.0650
.........................do...	.00180
.........................do...	.020
.............................. 7.6■
........................ 1" from neck
granular 80 per cent, silky 20 per cent ........................... n.	05,	08*
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............................