73
» i Pft' I ; /••
• ' i( • ■- . ‘I
APPENDIX O— Continued.
TESTS OF STEEL EYE BARS.
TESTS ON FULL-SIZE EYE BARS. . . .
- - :')J ■
“
O/liUIli llllhijlO.
■ ’ ll. . v .
t< ’
REMARKS. - " “ „
Dimensions, Inches.
Results of Mechanical Tests
Span.
Original.
Reduc-
j
Elastic
Max.
Areas.
Reduc-
tion,
Elonga-
tion,
Elastic
Limit,
Max.
Load,
Phos-
phorus,
Kind op Steel.
Made by
Forged by
- - ‘ --
Nominal.
Actual.
TION OF
Limit,
Load,
Place of ,
l , ; Melt
»
Original,
After
Area,
Fracture.
Number.
Testing.
Inches.
1 ■ ■
Width.
Thick-
ness.
Length. C. to C.
Gauged
Length.
Width.
Thick-
ness.
Width.
Thick-
ness.
Per cent.
Inches.
Per cent.
Lbs. persq. in.
Lbs. persq. in.
Inches.
Per cent.
Per cent.
Lbs. persq. in.
Lbs. persq.in.
Per cent.
Hbi.H
?
H
258.68
228
7.01
1.27
5.31
0.90
46.3
38.2
16.8
28 640
56 830
Body
” 11 072
1.0200
.5402
47.0
28.1
40 790
68 730
.030
Basic open-hearth
Carnegie, Phipps & Co.
-—5—1-
Union Bridge Co.
High steel. After test, bar cut in two, reheaded, not reannealed, test com- )
S
8
14 1
478.88
432
8.03
1.75
52.7
12.2
32 220
61 260
Not broken
10 770
1.0020
.6013
40.0
28.1
40 920
76 150
pleted as below. )
r*
it It ,
First half above. Broke in unannealed end near heat line of new head.Second half. Broke like above. Area between fracture and new head |
8
lf \U J
236.28
168
8.03
1.75
6.22
1.18
47.8
22.1
13.2
54 720
57 190
Body
10 770
10 770
«
S
8
(;
240.28
180
8.03
1.75
7.44
1.60
15.3
20.1
11.2
reduced 24.1 per cent. )
3
PS
After test. Bar cut in two, reheaded, not reannealed, retested as below.
First part of above.
Second part of above. Broke in unannealed part of bar on heat line of new’ (
a
C - *
8
H 1
* l
- 1 * J
478.88
432
8.00
1.26
51.7
12 0
32 380
62 93068 590
Not brokenBody
I1
10 77010 770
10 770
. J •
K
HH
8
236.99
156
8.00
1.26
6.29
0.94
41.37
25.8
16.5
8
238.18
168
8.00
1.26
6.41
0.85
45.9
18.2
10.8
58 880
head. 1
<
w
T
8
1 3
MS
254.63
216
7.98
1.20
6.14
0.92
41.0
33.2
15.4
31 930
63 870
tt
10 828
1.0100
.4108
59.3
21.9
40 900
69 800
.024
<1 II tt
tt tt i|
It tt ||
8
338.58
300
8.03
2.32
6.34
1.77
39.8
34.6
11.5
32 840
62 400
tt
10 660
1.0620
.5946
44.0
23.1
41 710
71 000
.066
tt tt tl
*< tt it
ti tt tt
Soft steel suspender.
7
258.68
216
7.00
1.18
5.27
0.85
45.8
30.8
17.0
27 870
53 520
Body
20 816
1.0560
.4995
52.7
31.9
32 480
58 050
.027
Basic open-hearth
Carnegie, Phipps & Co.
Pencoyd B. & C. Co.Keystone Bridge Co.
“ “ Full capacity of machine reached.
9
338.58
300
9.00
2.31
10.5
35.3
11.8
27 730
54 400
Not broken
09 257
1.0900
.5416
50.3
29.5
39 900
66 780
., f
t(
“ “ First part.
3
9
If )
206.58
168
9.09
1.25
6.81
0.83
50.3
39.1
23.3
32 590
57 410
Body
09 405
.9734
.4488
53.8
28.7
38 110
60 920
.014
tl ft tt
ft ti tt
“ “ Second part.
W
3
9
h f
205.38
168
9.09
1.25
6.94
0.94
42.6
34.8
20.7
32 820
58 440
09 405
Lower lateral. Broke at back end of upset for screw, disclosing piece of {
PS&1
6
1 3
409.08
348
6.07
1.18
19.5
5.6
35 480
60 390
In upset for screw
3 055
.830
.435
47.6
23.0
Pencoyd I. & S. Co.
Pencoyd B. & C. Co.
iron welded in. 1
H
Lower lateral.
6
1JL
416.78
360
6.04
1.18
21.6
6.0
39 190
63 220
Sleeve nut
3 327
.672-
.303
54.9
27.5
41 670
it tt
02
■
11 “
(< ((
4
1 3
T*
' 422.18
372
4.03
0.80
3.25
0.57
42.6
39.2
10.6
40 540
71 580
Body
3 095
1.026
.436
58.5
31.3
39 280
66 090
.084
ti it tt
it it tt
fl H ll
tt <1
&
4
l
421.88
372
4.02
1.00
3.10
0.75
41.8
45.1
12.1
39 570
68 490
t <
3 095
*• it tt
tt It it
it
II <i
4
H
423.08
372
4.04
1.13
3.08
0.79
46.8
47.8
12.8
39 720
69 180
If
3 095
it tt tt
ti tt tt
First part.
Second part.
8
8
Ht iHU
279.98
279.88
240
240
8.11
8.11
1.79
1.79
6.26
6.13
1.34
1.24
42.2
47.7
37.1
38.8
15.5
16.2
28 94028 660
58 01058 290
Body
11 15011 150
1.114
.5960
46.5
23.0
40 480
66 880
.030
Basic open-hearth
Carnegie, Phipps & Co.
Union Bridge Co.
First part.
£ hWOQ
7
1 l
289.23
252
7.02
1.00
5.53
0.75
40.9
44.9
17.8
31 380
59 850
11 072
1.020
.5402
47.0
28.1
40 790
68 730
.030
ft << <1
tt ti ti
Second part.
7
1 f
249.48
252
7.00
1.00
5.51
0.67
47.3
42.7
16.9
31 470
59 730
< <
11 072
Tlie first four bars were entirely experimental and did not represent bars wliicb it was intended to usein the structure. They were generally of rather too high a steel, and the result of these tests led to theadoption in the specifications of a special eye-bar steel, midway bet ween the medium and high grade steel.
Tests Nos. 5 and 6 were 6 inch bars which showed a weak steel below the requirements of thespecifications, and led to the substitution of 7 inch bars for 6 inch bars for all floor-beam suspenders, the7 inch bars being made of soft steel.
Tests 13 and 14 were both of the same bar. The first test was unsatisfactory and showed a flaw inthe steel. The second test was a test of a stretched bar relieaded after stretching, and not reannealed ;as was to be expected, it broke in the new head.
Test No. 16 showed a flaw. Test No. 17, of the same bar, when reheaded and planed down to areduced section, showed that the steel was excellent.
Test No. 18 was good. Tests Nos. 19 and 20 of the same bar broke in heads which had been forgedbut not reannealed, the last having been forged on a stretched bar.
Test 26 falls a little below the requirements of the specifications, and this was explained by a slightflaw at the fracture, the fracture taking place in the head.
Test 48 led to the rejection of the bars represented by it.