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Welded Light H-Beam
PRODUCT INTRODUCTION
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
#2 Web / #1 Flnage / #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
WELDABILITY
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
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
Description ASTM A-6 KS D 3558 (JIS G 3353) Remarks
General requirements for rolled steel plates, shapes, sheet Piling and bars for structural use Welded light gauge h steels for general structures
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㎜
WELDED LIGHT H-BEAM PRODUCTION SIZE


Product size up to Web 53~450㎜, Flange 45~300㎜, Thickness 12㎜
Dimension Unit Weight Sectional Area Moment of Inertia

Section Modulus

Radius of Gyration

Bending Availability

H B T1 T2 W A lx ly Zx Zy ix iy i n=iH/Af
kg/m   -
53 104 3.2 3.2 6.40 8.15 44 60.0 16.6 11.5 2.32 2.72 2.90 4.61
58 104 3.2 3.2 6.52 8.31 54 60.0 18.5 11.5 2.54 2.69 2.89 5.03
100 75 3.2 4.5 7.58 9.66 174 31.7 34.8 8.4 4.25 1.81 2.02 6.00
100 100 3.2 4.5 9.35 11.91 225 75.0 45.1 15.0 4.35 2.51 2.74 6.10
100 100 6.0 9.0 18.0 22.92 401 150.1 80.3 30.0 4.19 2.56 2.76 3.07
125 100 3.2 4.5 10.0 12.71 368 75.0 59.0 15.0 5.38 2.43 2.71 7.52
125 125 6.0 9.0 22.7 28.92 820 293.2 131.0 46.9 5.32 3.18 3.45 3.83
150 75 3.2 4.5 8.84 11.26 432 31.7 57.6 8.4 6.19 1.68 1.96 8.70
150 75 3.2 6.0 10.5 13.42 537 42.2 71.6 11.3 6.33 1.77 2.01 6.69
150 75 5.0 7.0 13.6 17.30 642 49.4 85.6 13.2 6.09 1.69 1.96 5.61
150 100 3.2 4.5 10.6 13.51 551 75.0 73.5 15.0 6.39 2.36 2.67 8.91
150 100 3.2 6.0 12.9 16.42 693 100.0 92.3 20.0 6.50 2.47 2.72 6.81
150 100 6.0 9.0 20.3 25.92 1011 150.2 135.0 30.0 6.24 2.41 2.70 4.49
150 150 3.2 6.0 17.6 22.42 1004 337.5 134.0 45.0 6.69 3.88 4.16 6.94
150 150 6.0 9.0 27.4 34.92 1459 506.5 195.0 67.5 6.46 3.81 4.13 4.59
150 150 7.0 10.0 30.7 39.10 1601 562.9 213.0 75.0 6.40 3.79 4.13 4.13
175 90 3.2 4.5 10.5 13.41 711 54.7 81.0 12.2 7.28 2.02 2.35 10.17
200 100 3.2 4.5 11.9 15.11 1046 75.1 105.0 15.0 8.32 2.23 2.61 11.59
200 100 3.2 6.0 14.1 18.02 1307 100.1 131.0 20.0 8.52 2.36 2.67 8.91
200 100 6.0 9.0 22.7 28.92 1944 150.3 194.0 30.1 8.20 2.28 2.63 5.85
200 150 3.2 4.5 15.4 19.61 1476 253.2 148.0 33.8 8.68 3.59 4.04 11.96
200 150 3.2 6.0 18.9 24.02 1871 337.6 187.0 45.0 8.83 3.75 4.11 9.13
200 150 4.5 6.0 20.8 26.46 1943 337.6 194.0 45.0 8.57 3.57 4.03 8.95
200 150 6.0 9.0 29.8 37.92 2766 506.6 277.0 67.5 8.54 3.66 4.07 6.02
200 200 6.0 9.0 36.8 46.92 3587 1200.3 359.0 120.0 8.74 5.06 5.50 6.11
200 200 8.0 12.0 48.7 62.08 4610 1600.8 461.0 160.1 8.62 5.08 5.51 4.59
250 100 3.2 4.5 13.1 16.71 1729 75.1 138.0 15.0 10.17 2.12 2.55 14.15
250 125 3.2 4.5 14.9 18.96 2069 146.6 165.0 23.1 10.44 2.78 3.26 14.47
250 125 4.5 6.0 20.2 25.71 2739 195.5 219.0 31.3 10.32 2.76 3.24 10.81
Dimension Unit Weight Sectional Area Moment of Inertia

Section Modulus

Radius of Gyration

Bending Availability

H B T1 T2 W A lx ly Zx Zy ix iy i n=iH/Af
kg/m   -
250 125 6.0 9.0 28.6 36.42 3893 293.4 311 46.9 10.34 2.84 3.29 7.30
250 150 3.2 4.5 16.6 21.21 2408 253.2 193 33.8 10.65 3.45 3.97 14.70
250 150 4.5 6.0 22.5 28.71 3185 337.7 255 45.0 10.53 3.43 3.96 10.99
250 150 4.5 9.0 29.4 37.44 4391 506.4 351 67.5 10.83 3.68 4.08 7.55
250 175 6.0 9.0 35.7 45.42 5200 804.3 416 91.9 10.70 4.21 4.72 7.49
250 250 6.0 9.0 46.3 58.92 7162 2344.2 573 187.5 11.02 6.31 6.87 7.64
300 150 3.2 4.5 17.9 22.81 36.4 253.2 240 33.8 12.57 3.33 3.90 17.35
300 150 4.5 6.0 24.3 30.93 4786 337.7 319 45.0 12.43 3.30 3.89 12.96
300 150 4.5 9.0 31.2 39.69 6559 506.5 437 67.5 12.85 3.57 4.03 8.95
300 150 6.0 9.0 34.5 43.92 6839 506.8 456 67.6 12.48 3.40 3.94 8.75
300 150 6.5 9.0 35.6 45.33 6933 506.9 462 67.6 12.37 3.34 3.91 8.69
300 175 4.5 6.0 26.7 33.96 5434 536.2 362 61.3 12.65 3.97 4.60 13.15
300 175 4.5 9.0 34.7 44.19 7512 804.1 501 91.9 13.04 4.27 4.74 9.04
300 200 6.0 9.0 41.5 52.92 8745 1200.5 583 120.1 12.85 4.76 5.37 8.95
300 200 8.0 12.0 55.0 70.08 11361 1601.2 757 160.1 12.73 4.78 5.38 6.72
300 300 6.0 9.0 55.7 70.92 12557 4050.5 837 270.0 13.31 7.56 8.24 9.16
350 175 4.5 6.0 28.4 36.21 7661 536.2 438 61.3 14.55 3.85 4.53 15.11
350 175 4.5 9.0 36.5 46.44 10532 804.3 602 91.9 15.06 4.16 4.69 10.43
350 175 6.0 9.0 40.4 51.42 10989 804.5 628 91.9 14.62 3.96 4.59 10.20
350 175 7.0 11.0 48.2 61.46 13123 983.5 750 112.4 14.61 4.00 4.61 8.39
350 200 6.0 9.0 43.9 55.92 12297 1200.6 703 120.1 14.83 4.63 5.31 10.32
400 200 4.5 9.0 41.8 53.19 15852 1200.3 793 120.0 17.26 4.75 5.36 11.92
400 200 6.0 9.0 46.3 58.92 16549 1200.7 827 120.1 16.76 4.51 5.24 11.65
400 200 7.0 11.0 55.3 70.46 19800 1467.7 990 146.8 16.76 4.56 5.27 9.58
400 200 8.0 12.0 61.3 78.08 21615 1601.6 1081 160.2 16.64 4.53 5.25 8.75
400 300 6.0 9.0 60.4 76.92 23430 4050.7 1171 270.0 17.45 7.26 8.11 12.01
450 200 4.5 9.0 43.5 55.44 20529 1200.3 912 120.0 19.24 4.65 5.32 13.29
450 300 6.0 9.0 62.7 79.92 30290 4050.8 1346 270.1 19.47 7.12 8.04 13.40
450 300 9.0 10.0 77.5 98.70 35008 4502.6 1556 300.2 18.83 6.75 7.86 11.79
WELDED LIGHT T-BAR PRODUCTION SIZE


Product size up to Web 70~450㎜, Flange 70~300㎜, Thickness 12㎜
Dimension Unit Weight Sectional Area Moment of Inertia

Section Modulus

Center of Gravity

Radius of Gyration
H B t1 t2 W A lx ly Zx Zy C ix iy
kg/m    
70 70 6 6 6.31 8.04 37.81 17.27 7.52 4.93 1.97 2.17 1.47
75 125 9 9 13.49 17.19 76.99 146.89 13.38 23.50 1.75 2.12 2.92
75 150 6 6 10.3 13.14 76 169 10 22.5 1.48 2.40 3.58
75 150 9 9 15.3 19.44 109 254 14 33.8 1.60 2.37 3.61
75 150 12 12 20.1 25.56 140 338 19 45.1 1.71 2.34 3.64
90 180 7 7 14.5 18.41 153 340 17 37.8 1.77 2.88 4.30
90 180 10 10 20.4 26.00 211 487 23 54.1 1.88 2.85 4.33
100 150 6 9 14.9 18.96 178 253 18 33.8 1.89 3.06 3.66
100 200 7 7 16.1 20.51 212 467 21 46.7 1.94 3.21 4.77
100 200 8 12 24.4 31.04 233 800 23 80.0 1.73 2.74 5.08
010 200 10 10 22.8 29.00 292 667 29 66.7 2.05 3.18 4.80
125 125 6 9 14.3 18.24 353 147 28 23.5 2.84 4.40 2.84
125 175 7 11 21.4 27.23 406 492 32 56.2 2.38 3.86 4.25
130 260 9 9 26.9 34.29 599 1319 46 101.5 2.51 4.18 6.20
130 260 12 12 35.6 45.36 778 1759 60 135.3 2.63 4.14 6.23
150 150 6 9 17.2 21.96 620 253 41 33.8 3.34 5.31 3.40
150 200 8 12 27.5 35.04 808 801 54 80.1 2.96 4.80 4.78
175 175 7 11 24.1 30.73 1144 492 65 56.2 3.82 6.10 4.00
200 200 6 9 23.1 29.46 1499 600 75 60.0 4.34 7.13 4.51
200 200 8 12 30.6 39.04 1958 801 98 80.1 4.45 7.08 4.53
250 250 9 9 34.7 44.19 4445 1173 178 93.9 6.59 140.03 5.15
250 250 10 10 38.5 49.00 4910 1304 196 104.3 6.62 10.01 5.16
300 300 10 10 46.3 59.00 8567 2252 286 150.2 7.87 12.05 6.18
APPLICATIONS
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
Container cross member
Fishery
Greenhouse
Steel Structure
Purlin
Soundproof wall
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