::: Dongbu Steel :::

Product Introduction

Production process

Size availability

Weldability

Applied specifications

Weld light H-beam production size

Welded light T-bar production size

Applications

Examples

Product Introduction

제목 없음

Dongbu Steel has produced welded light H-beam since implementing high-frequency electric resistance welding facilities of Thermatool Inc., U.S.A. in 1971. Our thirty years of accumulated know-how is the driving force behind our role in leading the industry trend toward lightweight steel production.

Our efforts to develop new products have also paid off with unequalled flange beams with upper and lower sections that differ in width and thickness; web off-center beams; structural Tees for trusses; and more recently, small-size light gauge H-beams (50×45×3.2×3.2) that can replace small-size angles. Channel and square pipe allows us to produce and provide beam products of various shapes and sizes, meeting the needs of our clients, something impossible to accomplish using only conventional hot-rolled beams.
We will continue our commitment to customer satisfaction through endless effort, sincerity, and trust.

Features of H-beams

1)	Smooth surface from hot coils with superior cleanliness
2)	Excellent sectional properties despite a thin appearance
3)	Optimal design and easy performance of assembly and construction
4)	A variety of uses

Superior properties of H-beams

1)	Produces small-size, light gauge, and wide sized products not possible with conventional hot-rolled H beams
2)	Requires over 20% less supplementary materials in comparison with other beams of the same sectional property
3)	Reduces construction time because of quick delivery of products (average 2~7 days, maximum 15 days)
4)	Maintains a zero loss ratio of raw material due to a custom-made production system and cost cuts for treatment (Length per piece 6~16m, product supply minimum unit: 10㎝)

Welded light H-beam products

Production process

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	#2 Web / #1 Flange / #3 Flange The un-coiler transfers the hot coil to the welded pipe, which is connected to the end portion of the leveler. The un-coiler consists of 3 sets: web, upper flange, and lower flange.

	Beam Former The beam former transforms the strip into an H-shape beam.

	Welder The welder continuously welds the H-Beam using the electric resistance welding method.

	Pull-out Mill
	The pull-out mill consists of drive rolls that continuously form and weld. The beam readjustment process also occurs.

	Cut-off M/C
	The cut-off machine cuts the H Beam at the length requested by the customer using the saw cutting method.

Size availability

제목 없음

Weldability

제목 없음

The quality and strength of flange-web welded parts are the most important elements of lightweight welded beams. The welding of Dongbu Steel's welded light H-beam is conducted under optimum conditions that have been put in place after a series of tests. Finished beams undergo rigorous inspection to guarantee the quality of our products.

Rate of weld metal disposition
The rate of weld metal (X) is obtained using the following equation.
Equation:X=w/tw×100(%)
tw: Where w represents the width of weld metal deposition and tw web thickness

* We guarantee a weld metal rate of 130% or higher

Tension tests
Tension tests are carried out by applying tension to the welded parts in a parallel direction with the web. This confirms whether or not the base metal or the welded part of the web suffers from a fracture exceeding the specified stress.

Applied specifications

제목 없음

KS D 3558 SWH400 (JIS G 3353 SWH400)

Chemical Composition, max.%			Tension Test
Base in Ladle Analysis			Tensile Strength	Yield Point	Elongation
C	P	S	㎏/㎟	min ㎏/㎟	Thickness	Test pieces	min. %
0.25	0.05	0.05	41 to 55	25	5 max.	No.5	21
					Over 5	No.1A	17

Dimensional tolerances

Descriptionr	ASTM A-6	KS D 3558(JIS G 3353)	Remarks
Descriptionr	General requirements for rolled steel plates, shapes, sheet Piling and bars for structural use	Welded light gauge h steels for general structures	Remarks
Web depth	±1/8in.	±1.5㎜
Flange width	±1/4in.,-3/16in	±1/5㎜
Thickness	Not specifed	2.3㎜:±0.25㎜ 3.2㎜:±0.30㎜ 4.5㎜:±0.45㎜ 6.0㎜ & Over:±0.60㎜
Length	30ft & under:±3/8in. Over 30ft:±3/8in. plus 1/16. for each additional 5ft. -3/8in.	+ Not specified -0
Camber & Sweep	1/8in.×(number of feet of total length/10)	Depth(H) Up to 300㎜:0.20%× total length Over 300㎜:0.10%× total length
Out-of-square	Depth(H)(T+T') Up to 12in.:1/4in. Over 12in.:5/16in.	Depth(H)T or T') Up to 300㎜:1.2%× Flange width(B) min. tolerance 2.0㎜ Over 300㎜:1.5%× Flange width(B)
Web-off-center	E≤3/16in.	s=(b1-b2)/2≤±2.0㎜
Maximum depth (C)	Any cross section Over theoretical depth C≤1/in.	Not specified
End-out-of-square	1/64in./in. of depth	1.6%Depth or Flange width min. toterance 3.0㎜

Weld light H-beam production size

제목 없음

Product size up to Web 53~450㎜, Flange 45~300㎜, Thickness 12㎜

Dimension				Section Area	Unit Weight	Moment of Inertia		Radius of Gyration		Section Modulus
H	B	tw	tf	A	W	lx	ly	ix	iy	Zx	Zy
㎜	㎜	㎜	㎜	㎠	kg/m	㎤	㎤	㎝	㎝	㎤	㎤
53	104	3.2	3.2	8.15	6.4	44.0	60.0	2.32	2.71	16.6	11.5
58	104	3.2	3.2	8.31	6.5	53.7	60.0	2.54	2.69	18.5	11.5
75	75	3.2	3.2	7.00	5.5	70.5	22.5	3.17	1.79	18.8	6.0
75	75	3.2	4.5	8.86	7.0	91.7	31.7	3.22	1.89	24.4	8.4
100	75	3.2	4.5	9.66	7.6	174.1	31.7	4.25	1.81	34.8	8.4
100	100	3.2	4.5	11.91	9.4	225.5	75.0	4.35	2.51	45.1	15.0
100	100	6.0	9.0	22.92	18.0	401.4	150.1	4.19	2.56	80.3	30.0
125	75	3.2	4.5	10.46	8.2	286.8	31.7	5.24	1.74	45.9	8.4
125	100	3.2	4.5	12.71	10.0	368.5	75.0	5.38	2.43	59.0	15.0
125	125	6.0	9.0	28.92	22.7	819.7	293.2	5.32	3.18	131.1	46.9
150	75	3.2	4.5	11.26	8.8	432.1	31.7	6.19	1.68	57.6	8.4
150	75	3.2	6.0	13.42	10.5	536.9	42.2	6.33	1.77	71.6	11.3
150	100	3.2	4.5	13.51	10.6	551.2	75.0	6.39	2.36	73.5	15.0
150	100	3.2	6.0	16.42	12.9	692.5	100.0	6.50	2.47	92.3	20.0
150	100	6.0	9.0	25.92	20.3	1010.9	150.2	6.24	2.41	134.8	30.0
150	150	3.2	6.0	22.42	17.6	1003.7	337.5	6.69	3.88	133.8	45.0
150	150	6.0	9.0	34.92	27.4	1458.8	506.5	6.46	3.81	194.5	67.5
175	90	3.2	4.5	13.41	10.5	710.8	54.7	7.28	2.02	81.2	12.2
200	100	3.2	4.5	15.11	11.9	1045.9	75.1	8.32	2.23	104.6	15.0
200	100	3.2	6.0	18.02	14.1	1306.6	100.1	8.52	2.36	130.7	20.0
200	100	6.0	9.0	28.92	22.7	1944.3	150.3	8.20	2.28	194.4	30.1
200	150	3.2	4.5	19.61	15.4	1476.0	253.2	8.68	3.59	147.6	33.8
200	150	3.2	6.0	24.02	18.9	1871.4	337.6	8.83	3.75	187.1	45.0
200	150	4.5	6.0	26.46	20.8	1943.3	337.6	8.57	3.57	194.3	45.0
200	150	6.0	9.0	37.92	29.8	2765.7	506.6	8.54	3.66	276.6	67.5
200	200	6.0	9.0	46.92	36.8	3587.1	1200.3	8.74	5.06	358.7	120.0
250	100	3.2	4.5	16.71	13.1	1729.5	75.1	10.17	2.12	138.4	15.0
250	100	4.5	9.0	28.44	22.3	3083.1	150.2	10.41	2.30	246.7	30.0
250	125	3.2	4.5	18.96	14.9	2068.6	146.6	10.44	2.78	165.5	23.4
250	125	4.5	6.0	25.71	20.2	2738.6	195.5	10.32	2.76	219.1	31.3
250	125	4.5	9.0	32.94	25.9	3736.8	293.1	10.65	2.98	298.9	46.9
250	125	6.0	9.0	36.42	28.6	3892.9	293.4	10.34	2.84	311.4	46.9
250	150	3.2	4.5	21.21	16.7	2407.6	253.2	10.65	3.45	192.6	33.8
250	150	4.5	6.0	28.71	22.5	3185.2	337.7	10.53	3.43	254.8	45.0
250	150	4.5	9.0	37.44	29.4	4390.6	506.4	10.83	3.68	351.2	67.5
250	175	6.0	9.0	45.42	35.7	5200.4	804.3	10.70	4.21	416.0	91.9
250	250	6.0	9.0	58.92	46.3	7161.5	2344.2	11.02	6.31	572.9	187.5
300	150	3.2	4.5	22.81	17.9	3604.4	253.2	12.57	3.33	240.3	33.8
300	150	4.5	6.0	30.96	24.3	4786.0	337.7	12.43	3.30	319.1	45.0
300	150	4.5	9.0	39.69	31.2	6558.8	506.5	12.85	3.57	437.3	67.5
300	150	6.0	9.0	43.92	34.5	6839.1	506.8	12.48	3.40	455.9	67.6
300	175	4.5	6.0	33.96	26.7	5434.3	536.2	12.65	3.97	362.3	61.3
300	175	4.5	9.0	44.19	34.7	7511.7	804.1	13.04	4.27	500.8	91.9
300	200	6.0	9.0	52.92	41.5	8745.0	1200.5	12.85	4.76	583.0	120.1
300	300	6.0	9.0	70.92	55.7	12556.9	4050.5	13.31	7.56	837.1	270.0
350	175	4.5	6.0	36.21	28.4	7661.3	536.2	14.55	3.85	437.8	61.3
350	175	4.5	9.0	46.44	36.5	10531.5	804.2	15.06	4.16	601.8	91.9
350	175	6.0	9.0	51.42	40.4	10989.0	804.5	14.62	3.96	627.9	91.9
350	200	6.0	9.0	55.92	43.9	12297.4	1200.6	14.83	4.63	702.7	120.1
400	200	4.5	9.0	53.19	41.8	15852.1	1200.3	17.26	4.75	792.6	120.0
400	200	6.0	9.0	58.92	46.3	16548.9	1200.7	16.76	4.51	827.4	120.1
400	300	6.0	9.0	76.92	60.4	23429.7	4050.7	17.45	7.26	1171.5	270.0

Welded light T-bar production size

제목 없음

Product size up to Web 70~450㎜, Flange 70~300㎜, Thickness 12㎜

Dimension				Section Area	Unit Weight	Moment of Inertia		Radius of Gyration		Section Modulus
H	B	tw	tf	A	W	lx	ly	ix	iy	Zx	Zy
㎜	㎜	㎜	㎜	㎠	kg/m	㎤	㎤	㎝	㎝	㎤	㎤
70	70	6	6	8.04	6.3	38	17	2.17	1.47	7.52	4.93
75	125	9	9	17.19	13.5	77	147	2.12	2.92	13.38	23.50
75	150	6	6	13.14	10.3	57	169	2.07	3.58	9.40	22.52
75	150	9	9	19.44	15.3	80	254	2.03	3.61	13.63	33.80
75	150	12	12	25.56	20.1	102	338	2.00	3.64	17.62	45.12
90	180	7	7	18.41	14.5	114	340	2.49	4.30	15.82	37.83
90	180	10	10	26.00	20.4	156	487	2.45	4.33	21.97	54.07
100	150	6	9	18.96	14.9	136	253	2.68	3.66	16.74	33.77
100	200	7	7	20.51	16.1	159	467	2.78	4.77	19.67	46.69
100	200	8	12	31.04	24.4	184	800	2.44	5.08	22.31	80.04
100	200	10	10	29.00	22.8	218	667	2.74	4.80	27.38	66.74
125	125	6	9	18.21	14.3	247	147	3.68	2.84	25.54	23.47
125	175	7	11	27.23	21.4	309	492	3.37	4.25	30.51	56.18
130	260	9	9	34.29	26.9	448	1319	3.62	6.20	42.77	101.46
130	260	12	12	45.36	35.6	580	1759	3.57	6.23	55.88	135.33
150	150	6	9	21.96	17.2	434	253	4.44	3.40	37.19	33.78
150	200	8	12	35.04	27.5	603	801	4.15	4.78	50.13	80.06
175	175	7	11	30.73	24.1	810	492	5.13	4.00	59.19	56.20
200	200	6	9	29.46	23.1	1050	600	5.97	4.51	67.04	60.03
200	200	8	12	39.04	30.6	1370	801	5.92	4.53	88.15	80.08
250	250	9	9	44.19	34.7	2777	1173	7.93	5.15	150.80	93.87
250	250	10	10	49.00	38.5	3067	1304	7.91	5.16	166.91	104.33
300	300	10	10	59.00	46.3	5353	2252	9.52	6.18	241.91	150.16

Applications

제목 없음

Welded light H-beam is widely used for making piles for simple structures, pre-fabricated homes, portable houses, buildings, containers, and trailers.

Application

Classification

Examples

Structures

· Factory

· Warehouse

· Livestock house

· Mansion

· Building

· Arcade & Gymnasium

· Platform

· Debris barrier

· Conneting material of drain channel

· Apartment roofing material

· Greenhouse

·	Column and truss of factory of Warehouse.
	Column: main & sub column.
	Truss : main & sub truss
·	Frame work materials for lower floor building (office, shop, etc.)
·	Member of frame work for high building
·	Mobile office and homes to be assembled easily
·	Column and rafter of stable (Cowhouse, Pigsty, etc.)
·	School, gymnasium and arcade.
·	Subway and station platform.

Others

· Guardrail post

· Rock Fence

· Tunnel support

· Mansion pile

· Livestock house

·	Highway guard rail post.
·	Retaining wall for arresting falling stone.
·	Supporter for safe, fast construction of tunnels.
·	Supporting bearing pile.

Examples

제목 없음

	1) Container cross member


	2) Fishery


	3) Greenhouse


	4) Steel Structure


	5) Purlin


	6) Soundproof wall