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ERW pipe
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Aluminum
Specialty Metals
Gilsonite
Electric Resistance Welding Pipe
PRODUCT INTRODUCTION
Production features
The high-frequency electricity-resistant welding method developed by the Thermatool Group of the United States is used in the production of our ERW pipes. Thermatool's technology renders superb weldability to our products. Customer’s preference for Dongbu Steel's ERW pipes over other available products is attributed to its wide range of applications.
Excellent quality
Dongbu Steel produces pipes of outstanding quality. Our rigorous quality control combined with 30 years of accumulated know-how and technology, are contributors behind our top-quality products.
Immaculate finish on welded sections
In order to enhance the ductility of the welded portion Dongbu Steel applies seam annealing, which uses a high-frequency induction heating procedure after the welding process.
A wide range of production capabilities
With production equipment designed based on our extensive experience, we produce a wide range of pipes with wall thickness ranging from extremely light to heavy from 5" to 20"(125A ~ 500A) in outside diameter.
MAJOR PRODUCTS
Classification Spec. No. Application
Steel pipes for ordinary piping KS D3507
JIS G3542
ASTM A120
ASTM A135 GrA
ASTM A53 GrA
BS 1387
Water supply and sewage, industrial water, irrigation, oil & gas supply, sprinkler,fire hydrant, ship piping etc.
Galvanized steel pipes for water service KS D3537
JIS G3442
Steel pipes for pressure service KS D3562, JIS G3454, ASTM A53 GrB, ASTM A135 GrB For pressure service at temperature not exceeding 350℃
Steel pipes for pressure service KS D3566, JIS G3444, ASTM A500, BS1775

Building, bridge, harbor, steel tower, electric light post, scaffold, etc.

Steel tubes for machine structural purposes KS D3517, JIS G3466
Steel pipe piles KS F4602, ASTM A252
Line pipe API 5L

Oil or natural gas piping

Oil well tubular goods API 5CT

Oil well casing and tubing

Major facilities of ERW
PRODUCTION AVAILABILITY
KOREAN INDUSTRIAL STANDARD DIMENSIONS SPECIFICATIONS
CKS D3507 general carbon pipes (KS D3537 Galvanized steel pipes for water service)
Type Outside diameter Permissible variations in outside diametr Thickness Permissible variations in thickness Weight not including socket
A B mm Taper screw pipe Other pipe mm ㎏/m
125
150
175
5
6
7
139.8
165.2
190.7
±0.8㎜
±0.8㎜
±0.9㎜
±1%
±1%
±1%
4.85
4.85
5.3
-12.5% max 16.1
19.2
24.2
200
225
250
300
350
400
450
500
8
9
10
12
14
16
18
20
216.5
241.8
267.4
318.5
355.6
406.4
457.2
508.0
±1.0㎜
±1.2㎜
±1.3㎜
±1.5㎜
-
-
-
-
±1%
±1%
±1%
±1%
±1%
±1%
±1%
±1%
5.85
6.2
6.40
7.00
7.60
7.9
7.9
7.9
30.4
36.0
41.2
53.8
65.2
77.6
87.5
97.4
KS D3562 Carbon steel pipes for pressure service
Type of pipe Outside diametermm Permissible variations in outside diameter
Schedule 20 Schedule 30 Schedule 40 Schedule 60 Schedule 80
Thk. W Hydraulic test pressure Thk. W Hydraulic test pressure Thk. W Hydraulic test pressure Thk. W Hydraulic test pressure Thk. W Hydraulic test pressure
125 5 139.8 5.1 16.9 35       6.6 21.7 60 8.1 26.3 90 24.2 30.5 120
150 6 165.2 5.5 21.7 35       7.1 27.7 60 9.3 35.8 90 11.0 41.8 120
200 8 216.3 6.4 33.1 35 7.0 36.1 50 8.2 42.1 60 10.3 52.3 90 12.7 63.8 120
250 10 267.4 6.4 41.2 35 7.8 49.9 50 9.3 59.2 60 12.7 79.8 90 15.1 93.9 120
300 12 318.5 6.4 49.3 35 8.4 64.2 50 10.3 78.3 60 14.3 107 90 17.4 129 120
350 14 355.6 7.9 67.7 35 9.5 81.1 50 11.1 94.3 60 15.1 127 90 19.0 158 120
400 16 406.4 7.9 77.6 35 9.5 93.0 50 12.7 123 60 16.7 160 90 21.4 203 120
KS D3562 Carbon steel pipes for pressure service
Outside diameter Thickness Weight Sectional Area Moment of Inertia Section Modulus Radius of Gyration
mm m ㎏/m ㎝⁴
139.8 3.6 12.1 15.40 357 51.1 4.82
4.0 13.4 17.07 394 56.3 4.80
4.5 15.0 19.13 438 62.7 4.79
6.0 19.8 25.22 566 80.9 4.74
165.2 4.5 17.8 22.72 734 88.9 5.68
5.0 19.8 25.16 808 97.8 5.67
6.0 23.6 30.01 952 115 5.63
7.0 27.3 34.79 109×10 132 5.60
216.5 4.5 23.5 29.94 168×10 155 7.49
6.0 31.1 39.61 219×10 203 7.44
7.0 36.1 46.03 252×10 233 7.40
8.0 41.1 52.35 284×10 263 7.37
267.4 6.0 38.7 49.27 421×10 315 9.24
7.0 45.0 57.27 486×10 263 9.21
8.0 51.2 65.19 549×10 411 9.18
9.0 27.4 73.06 611×10 457 9.14
318.5 6.0 46.2 58.91 719×10 452 11.1
7.0 53.8 68.50 831×10 552 11.0
8.0 61.3 78.04 941×10 591 11.0
9.0 68.7 87.51 105×10 659 10.9
355.6 6.3 54.3 69.13 105×10² 593 12.4
8.0 68.6 87.36 132×10² 742 12.3
9.0 76.9 98.00 147×10² 828 12.3
12.0 102 129.5 191×10² 108×10 12.2
406.4 9.0 88.2 112.4 222×10² 109×10 14.1
12.0 117 148.7 289×10² 142×10 14.0
457.2 9.0 99.2 69.13 318×10² 140×10 15.8
12.0 132 87.36 416×10² 182×10 15.7
508.0 9.0 111 69.13 439×10² 173×10 17.6
12.0 147 87.36 575×10² 226×10 17.5
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