NICKEL STEEL.
400
No. 7386.
Marks, 3.
Diameter, ".500.
Sectional area, .196 square inch. Gauged length, 2".
Remarks.
Initial load.
Elastic limit.
Tensile strength.
Successive permanent set.
Inch.
0.
0.
Permanent set.
Inch.
0.
0.
Successive elongation per inch.
Elongation per inch.
Inch.
0.
.00010 . 00025 .00030 .00030 .00035 .00035 .01035 . 00075 . 00075 .00175 .00275 .00575 . 00625 .00850 .01525
Inch.
0.
.00010 .00035 .00065 .00095 .00130 . 00165 . 01200 . 01275 .01350 . 01525 . 01800 .02375 .03000 .03850 .05375
Applied loads per square inch.
Pounds. 1,000 5,000 10,000 20,000
30.000
40.000
49.000
50.000
51.000
52.000
54.000
56.000
60.000
64.000
68.000 72,000 82,400
......pounds.. 82,400
.........do...	49,000
........inch..	.2550
..........do...	.00165
..........do...	.150
.............. 51.0
___at middle of stem
fine silky, cup-shaped .......... ".30*, ".21
General summary.
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.
TABULATION OF TENSION SPECIMENS OF NICKEL STEEL.
Stems of specimens, 2" long, ".500 diameter. Sectional area, .196 square inch.
	*								
No. of test.	Mark on specimen.	Elastic limit per square inch.	Tensile strength per square inch.	Elongation in 2 inches.	Contraction of area.	Appearance of fracture.	Elongation of inch sections.
7293 7294	3״ round N. steel — 3" round N. steel — 3" round N. steel —	Pounds. 48.000 48.000 49.000 52.000	Pounds. 80,510 79,640 80,710 93,370	Percent. 25.5 25.0 23.0 6.5	Percent. 50.9 50.9 48.1 7.6	Fine silky	 	do		n // .15, . 36* .15, . 35* .13, .33*
7295 7384 7385 7386						Granular 80per cent,	.05, . 08*
		45,000	84,290	20.0	29.1	silky 20 per cent. Silky, oblique		.21*, .19 .30*, .21
		49,000	82,400	25.5	51.0	Pine silky, cup-	
						shaped.	—