RIFLE-BARREL STEEL, .30 CALIBER.
74
No. 7395.
Marks, M 3 B.
Sectional area, .25 square inch. Gauged length, 1".
From butt of finished barrel.
Rolled, and annealed at residual heat.
Inch.
0.	Initial load.
Successive permanent set.
Permanent set.
Inch.
0.
0. 0.
Elastic limit.
. Tensile strength.
Successive elongation per inch.
Inch.
0.
.0002 .0002 .0003 . 0003 .0004 .0004 .0003 .0004 .0003 . 0002' .0085 .0032 .0028 .0045 .008 .01 .01 .04
¡Elongation per inch.
Inch.
0.
.0002
.0004
.0007
.0010
.0014
.0018
.0021
.0025
.0028
.0030
.0115
.0147
.0175
.0220
.03
.04
.05
.09
Applied loads per square inch.
Pounds. 1,000 5,000 10,000 20,000
30.000
40.000
50.000
60.000
70.000
80.000
84.000
85.000
86.000
88,000
92.000
96.000 100,000 108,000 116,000 118,800
.pounds.. 118,800
____do... 84,000
...inch..	.18
....do...	.0030
....fine granular
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......
Character of broken surface............................