399
NICKEL STEEL,
No. 7385.
Marks, 2.
Diameter, ".500.
Sectional area, .196 square inch. Gauged length, 2".
Initial load.
Elastic limit.
Tensile strength.
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	¡Permanent set.	Successive permanent set.
Pounds. 1,000 5,000 10,000 20,000	Inch. 0. .00010 . 00035	Inch. 0. .00010 .00025	Inch. 0. 0.	Inch. 0. 0.
	.00065	. 00030		
SO, 000	.00100	.00035		
40.000 45.000	.00140 .00170	.00040 .00030	0.	0.
46.000 47.000 48.000 49.000	.00400	. 00230		
	. 00650	. 00250		
	. 00900	.00250		
	.00960	.00060		
50,000	. 01060	. 00100		
52.000 56.000 60.000	.01200	.00140		
	. 01675	.00475		
	. 02200	.00525		
64,000	. 02800	. 00600		
68,000	.03550	.00750		
72' 000	.04350	.00800		
84¡ 290				
				
General summary.
Tensile strength per square inch of original section.............................pounds.. 84,290
Elastic limit per square inch of original section..................................do... 45,000
Elongation per inch after rupture................................................inch.. . 2000
Elongation per inch under strain at elastic limit..................................do... . 00170
Reduction in diameter at point of rupture..........................................do...	. 080׳
Reduction in area after rupture, per cent of original section............................ 29.1
Position of rupture.........................................................at middle of stem
Character of broken surface......................................................silky, oblique
Elongation of inch sections........................................................".21*, ".19