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  Pipes for Structural Purposes

6.
Steel Tubes for Structural Purpose Conforming To IS:1161/1979

N.B. and Series Outside diameter Thickness Nominal weight Black Tubes Plain End Calculated Nominal weight Galvanised Tubes Plain End
  mm mm kg/m m/tonne kg/m m/tonne
15   L
       M
       H
21.3 2.00
2.65
3.25
0.96
1.22
1.45
1042
820
690
1.00
1.27
1.50
1000
787
667
20    L
       M
       H
26.9 2.35
2.65
3.25
1.42
1.58
1.90
704
633
526
1.47
1.64
1.96
680
610
510
25    L
       M
       H
33.7 2.65
3.25
4.05
2.04
2.46
2.99
490
407
259
2.09
2.52
3.94
478
397
254
32    L
       M
       H
42.4 2.65
3.25
4.05
2.61
3.15
3.86
383
317
259
2.69
3.24
3.94
372
309
254
40    L
       M
       H
48.3 2.90
3.25
4.05
3.27
3.61
4.43
306
277
226
3.37
3.73
4.55
297
268
220
50    L
       M
       H
60.3 2.90
3.25
3.65
4.50
4.14
4.57
5.10
6.17
242
219
196
126
4.26
4.71
5.25
8.09
235
212
190
124
65    L
       M
       H
76.1 3.25
3.65
4.50
5.84
6.53
7.92
171
153
126
5.99
6.70
8.09
167
149
124
80    L
       M
       H
88.9 3.25
4.05
4.85
6.86
8.48
10.10
146
118
99
7.04
8.70
10.32
142
115
97
90    L
       M
       H
101.6 3.65
4.05
4.85
8.82
9.75
11.60
113
103
86
9.09
10.03
11.87
110
100
84
100   L
        M
        H
114.3 3.65
4.50
5.40
9.97
12.10
14.50
100
83
69
10.18
12.39
14.69
98
81
68
110   L
        M
        H
127.0 4.50
4.85
5.40
13.6
14.6
16.2
74
68
62
13.9
14.90
16.5
72
67
61
125   L
        M
        H
139.7 4.50
4.85
5.40
14.9
16.2
17.9
67
62
56
15.24
16.56
18.16
66
60
65
135   L
        M
        H
152.4 4.50
4.85
5.40
16.4
17.7
19.5
61
57
51
16.77
18.07
19.87
60
55
50
150   L
        M
        H
165.1 4.50
4.85
5.40
17.8
19.2
21.2
56
52
47
18.20
19.63
21.62
55
51
46
150   L
        M
        H
168.3 4.50
4.85
5.40
6.30
18.1
19.6
21.7
25.3
55
51
46
40
18.50
20.00
22.10
25.7
54
50
45
39
175   L
        M
        H
193.7 4.85
5.40
5.90
22.60
25.00
27.30
44
40
37
23.13
25.53
27.83
43
39
36
200   L
        M
        H
219.1 4.85
5.60
5.90
25.7
29.4
31.0
39
34
32
26.24
29.94
31.54
38
33
32
250   H 273.0 5.90 38.8 26 39.56 25
300   H 323.9 6.3 49.5 20 50.40 20
350   H 355.6 8.00 68.6 14.50 69.58 14

A. Physical Properties

Grade Y.S. (min)
MPa (kg/mm2)
T.S. (min)
MPa (kg/mm2)
% age
Elongation
YST-210 210 (21.42) 330 (33.66) 20
YST-240 240 (24.48) 410 (41.82) 17

Note: For tube sizes upto and including 25 mm NB, elongation of 12%shall be permissible.

B. Tolerances

Steel Pipes
i) Outside diameter
Upto & including 48.3 mm

Over 48.3 mm

ii) Thickness

+ 0.4 mm
- 0.8 mm
± 1%

+ Not limited
- 10%
iii) Weight
- Single Tube

-For quantities less than
150 metres of one size

- For quantities 150 and over of one size.

+ 10%
- 8%
+ 10%
- 8%

± 4%



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