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Seamless Pipe

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Seamless Pipe

Seamless pipes are steel pipes manufactured without any welded joints, making them stronger, more reliable, and better suited for high-pressure applications. Unlike welded pipes, seamless pipes are made through a process that involves heating a solid steel billet and piercing it to create a hollow tube, ensuring uniform structure and enhanced mechanical properties.

Seamless pipes are widely used in industries such as oil & gas, power generation, chemical processing, automotive, and construction. They offer superior strength, resistance to pressure, and better corrosion resistance compared to welded pipes, making them ideal for transporting fluids, gases, and structural applications.

Seamless pipes are known for their strength, durability, and ability to withstand high-pressure and high-temperature conditions.

Manufacturing Process of Seamless Pipes

Seamless pipes are produced using one of the following methods:

  1. Hot Rolling: A solid steel billet is heated and pierced to form a hollow tube, then elongated and shaped into a seamless pipe.
  2. Cold Drawing: A hot-rolled seamless pipe is further processed at room temperature to achieve precise dimensions and a smoother finish.

Properties of Seamless Pipes

  1. High Strength: Seamless pipes have uniform strength across their structure, making them suitable for high-pressure applications.
  2. Corrosion Resistance: They offer better resistance to corrosion compared to welded pipes, especially when made from alloy or stainless steel.
  3. No Welded Joints: Absence of weld seams eliminates weak points, reducing the risk of failure under pressure.
  4. Smooth Inner Surface: Ensures better fluid flow and reduces friction, making them efficient for fluid transportation.
  5. Better Dimensional Accuracy: Cold-drawn seamless pipes have tight tolerances and precise dimensions.
  6. High Temperature Resistance: Suitable for use in high-temperature environments like boilers, heat exchangers, and power plants.
  7.  

Advantages

  • Stronger and More Durable: Seamless pipes can withstand higher pressure and stress without failure.
  • Leak-Proof Construction: The absence of seams eliminates the risk of leaks at weld joints.
  • Uniform Thickness: Provides consistent wall thickness for better performance in structural and industrial applications.
  • Higher Load-Bearing Capacity: Suitable for heavy-duty and critical applications.
Nominal Pipe Size
O/D
Schedule 10
Schedule 20
Schedule 30
Schedule STD
Schedule 40
Schedule 60
Schedule Extra Strong (XS)
Schedule 80
Schedule 120
Schedule 140
Schedule 160
Schedule Double Extra Strong
mm
inch
Mm
mm
Kg/m
mm
Kg/m
mm
Kg/m
Wall
wt.
Wall
wt.
Wall
wt.
Wall
wt.
Wall
wt.
Wall
wt.
Wall
wt.
Wall
wt.
Wall
wt.
Wall
wt.
z3
1-Aug
10.3
1.73
0.37
1.73
0.37
2.41
0.47
2.41
0.47
6
1-Apr
13.7
2.24
0.63
2.24
0.63
3.02
0.8
3.02
0.8
10
3-Aug
17.1
2.31
0.84
2.31
0.84
3.2
1.1
3.2
1.1
15
1-Feb
21.3
2.77
1.27
2.77
1.27
3.73
1.62
3.73
1.62
4.78
1.95
7.5
2.55
20
3-Apr
26.7
2.87
1.69
2.87
1.69
3.91
2.2
3.91
2.2
5.6
2.9
7.82
3.64
25
1
33.4
3.38
2.5
3.38
2.5
4.55
3.24
4.55
3.24
6.4
4.24
9
5.45
32
1.1/4
42.2
3.56
3.39
3.56
3.39
4.85
4.47
4.85
4.47
6.4
5.61
9.7
7.77
40
1.1/2
48.3
3.68
4.05
3.68
4.05
5.08
5.41
5.08
5.41
7.14
7.25
10.2
9.56
50
2
60.3
3.9
5.44
3.9
5.44
5.5
7.48
5.5
7.48
8.7
11.11
11.1
13.4
65
2.1/2
73/0
5.16
8.63
5.16
8.63
7
11.41
7
11.41
9.5
14.92
14
20.4
80
3
88.9
5.5
11.3
5.5
11.3
7.62
15.3
7.14
15.3
11.13
21.35
15.24
27.7
90
3.1/2
101.6
5.74
13.57
5.74
13.57
8.08
18.63
8.08
18.63
16.2
34.1
100
4
114.3
6.02
16.07
6.02
16.07
8.56
22.3
8.56
22.3
11.13
11.13
28.32
13.5
33.5
17.12
41.03
125
5
141.3
6.55
21.77
6.55
21.77
9.53
30.9
9.53
30.9
12.7
12.7
40.2
15.9
49.11
19
57.4
150
6
168.3
7.11
28.26
7.11
28.26
10.97
42.5
10.9
42.5
14.3
14.3
54.2
18.3
67.5
21.95
79.22
200
8
219.1
6.35
33.3
7
36.8
8.2
42.5
8.2
42.5
10.3
53.1
12.7
64.6
12.7
64.5
15.1
75.92
18.3
90.4
20.6
100.9
23
111.27
22.23
108
250
10
273
6.35
41.7
7.8
51.3
9.27
60.3
9.27
60.3
12.7
81.5
12.7
81.5
15.1
96
18.3
114.7
21.44
133
25.4
155
28.6
172.3
25.4
155
300
12
323.8
6.35
49.7
8.4
65.2
9.53
73.8
10.3
79.7
14.3
109
12.7
97.4
17.4
132
21.4
160
25.4
187
28.6
208
33.3
238.7
25.4
187
350
14
355.6
6.35
54.6
7.92
68.1
9.53
81.3
9.53
81.3
11.13
94.6
15.1
126.4
12.7
107
19
158
23.8
195
27.8
224
31.8
253.5
36.7
281
400
16
406.4
6.35
62.6
7.92
77.9
9.5
93.3
9.53
93.3
12.7
123
16.7
160
12.7
123
21.44
203
26.2
245
30.9
286
36.53
333
40.5
366
450
18
457.2
6.35
70.5
7.92
87.7
11.1
122
9.53
105
14.3
156
19.0c
206
12.7
130
23.8
254
21.4
310
34
363
39.7
408.3
45.2
459
500
20
508
6.35
78.5
9.53
117.2
12.7
155.1
9.53
117.2
15.1
183
20.6
248
12.7
155.1
26.2
311
32.5
381
38.1
441
44.4
508
50
564
550
22
558.8
6.35
86.4
9.53
129
12.7
171
9.53
129
22.2
294
12.7
171
28.6
373
34
451
41.3
526
47.6
600
54
672
600
24
600.5
6.35
94.5
9.53
141
14.3
210
9.53
141
17.4
255
24.5
355
12.87
187
30.9
442
38.8
547.7
46
640
52.4
720
59.5
808
650
26
660.4
7.92
127
12.7
203
9.53
153
202
12.7
A 106 Gr B  API - 5L - Gr B  A 33 Gr 6  A 335 P 5
700
28
711
7.92
137.4
12.7
218
15.8
292
9.53
165
218
12.7
A 106 Gr B  API - 5L - Gr B  A 33 Gr 6  A 335 P 5
750
30
762
7.92
147
12.7
234.6
15.8
292.6
9.53
176
234
12.7
A 106 Gr B  API - 5L - Gr B  A 33 Gr 6  A 335 P 5
800
32
812.8
7.92
157
12.7
250.6
15.8
312.5
9.53
188.2
364.9
251
12.7
A 106 Gr B  API - 5L - Gr B  A 33 Gr 6  A 335 P 5
850
34
863.6
7.92
167
12.7
282.4
15.8
351.7
9.53
200
17.5
420.4
266
12.7
A 106 Gr B  API - 5L - Gr B  A 33 Gr 6  A 335 P 5
900
36
914.4
7.92
176.6
12.7
282.4
15.8
352.2
9.53
212
19.1
282
12.7
A 106 Gr B  API - 5L - Gr B  A 33 Gr 6  A 335 P 5

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