::: Dongbu Steel :::

Product Introduction

Product Introduction

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	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

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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 general structural purposes

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

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Korean industrial standard dimensions specifications

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KS D3507 general carbon pipes (KS D3537 Galvanized steel pipes for water service)

Type of pipe		Outside diameter	Permissible variations in outside diameter		Thickness	Permissible variations in thickness	Weight not including socket
A	B	mm	Taper screw pipe	Other pipe	mm	Permissible variations in thickness	㎏/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	-12.5% max	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 dia -meter	Permissible variations in outside diameter
			Schedule 20			Schedule30			Schedule40			Schedule60			Schedule80
			Thick -ness	W	Hydraulic test pressure	Thick -ness	W	Hydraulic test pressure	Thick -ness	W	Hydraulic test pressure	Thick -ness	W	Hydraulic test pressure	Thick -ness	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 D3566 carbon steel pipes for general structural purposes