Hot Rolled Bulb Flat Bar
Hot rolled bulb flat bar is a special type of steel, consisting of a flat web and a spherical head, resulting in an asymmetrical shape. It is widely used in shipbuilding and bridge construction. The domestic standard for hot rolled bulb flat bar is GB/T9945-2001, “Hot Rolled Bulb Flat Bar,” which is consistent with the European standard EN10067:1996, “Hot Rolled Bulb Flat Bar,” differing only in tolerances and material specifications.
Description
Hot rolled bulb flat bar, also as known Steel Bulb Flat, Bulb Flat Bar, is a special type of steel, consisting of a flat web and a spherical head, resulting in an asymmetrical shape. It is widely used in shipbuilding and bridge construction.
The domestic standard for hot rolled bulb flat bar is GB/T9945-2001, “Hot Rolled Bulb Flat Bar,” which is consistent with the European standard EN10067:1996, “Hot Rolled Bulb Flat Bar,” differing only in tolerances and material specifications.
Applications of hot rolled bulb flat bar:
With the rapid development of the shipbuilding industry, hot rolled bulb flat bar for shipbuilding has gradually become a leading steel section for marine applications. Hot rolled bulb flat bar is primarily used as reinforcement for ship plates, acting like the “ribs” of a ship, providing sturdy support.
Hot rolled bulb flat bar is worth noting that the Chinese shipbuilding industry prefers steel bulb flats, while countries like Japan and South Korea prefer marine angle steel (equal angle steel, unequal angle steel, and unequal and unequal thickness angle).
Hot rolled bulb flat bar plays a vital role in both the domestic and international markets. Its unique structure and excellent performance make it indispensable in shipbuilding.
Specifications of Bulb Flat Bar:
|
Model Number
|
Nominal Size (mm)
|
Theoretical Weight (Kg/m)
|
||||
|
b
|
t
|
h
|
r1
|
r
|
||
|
80X5
|
80
|
5
|
19
|
4
|
≤1.5
|
4.25
|
|
80X6
|
6
|
20
|
≤2
|
4.88
|
||
|
100X7
|
100
|
7
|
22.5
|
4.5
|
≤2
|
6.86
|
|
100X8
|
8
|
23.5
|
7.65
|
|||
|
120X6
|
120
|
6
|
23
|
5
|
≤2
|
7.32
|
|
120X7
|
7
|
24
|
8.26
|
|||
|
120X8
|
8
|
25
|
9.2
|
|||
|
140X7
|
140
|
7
|
26
|
5.5
|
≤2
|
9.75
|
|
140X8
|
8
|
27
|
10.85
|
|||
|
140X10
|
10
|
29
|
≤3
|
13.05
|
||
|
160X7
|
160
|
7
|
29
|
6
|
≤2
|
11.46
|
|
160X8
|
8
|
30
|
12.72
|
|||
|
160X9
|
9
|
31
|
13.97
|
|||
|
160X11
|
11
|
33
|
≤3
|
16.49
|
||
|
180X8
|
180
|
8
|
33
|
7
|
≤2
|
14.8
|
|
180X9
|
9
|
34
|
16.22
|
|||
|
180X10
|
10
|
35
|
≤3
|
17.63
|
||
|
180X11
|
11
|
36
|
19.04
|
|||
|
200X9
|
200
|
9
|
37
|
8
|
≤2
|
18.57
|
|
200X10
|
10
|
38
|
≤3
|
20.14
|
||
|
200X11
|
11
|
39
|
21.71
|
|||
|
200X12
|
12
|
40
|
23.28
|
|||
|
220X10
|
220
|
10
|
41
|
9
|
≤3
|
22.27
|
|
220X11
|
11
|
42
|
24.5
|
|||
|
220X12
|
12
|
43
|
26.22
|
|||
|
240X10
|
240
|
10
|
40
|
10
|
≤3
|
25.5
|
|
240X11
|
11
|
45
|
27.39
|
|||
|
240X12
|
12
|
46
|
29.27
|
|||
|
260X10
|
260
|
10
|
47
|
11
|
≤3
|
28.25
|
|
260X11
|
11
|
48
|
30.39
|
|||
|
260X12
|
12
|
49
|
32.43
|
|||
|
280X10
|
280
|
11
|
51
|
12
|
≤3
|
33.5
|
|
280X11
|
12
|
52
|
35.7
|
|||
|
280X12
|
13
|
53
|
37.9
|
|||
|
300X11
|
300
|
11
|
54
|
13
|
≤3
|
36.7
|
|
300X12
|
12
|
55
|
39.09
|
|||
|
300X13
|
13
|
56
|
41.44
|
|||
|
320X12
|
320
|
12
|
58
|
14
|
≤3
|
42.6
|
|
320X13
|
13
|
59
|
45.09
|
|||
|
320X14
|
14
|
60
|
≤4
|
47.6
|
||
|
340X12
|
340
|
12
|
61
|
15
|
≤3
|
46.2
|
|
340X13
|
13
|
62
|
48.86
|
|||
|
340X14
|
14
|
63
|
≤4
|
51.5
|
||
|
370X13
|
370
|
13
|
66.5
|
≤3
|
54.7
|
|
|
370×14
|
14
|
67.5
|
16.5
|
≤4
|
57.6
|
|
|
370×15
|
15
|
68.5
|
16.5
|
≤4
|
60.5
|
|
|
400×14
|
400
|
14
|
72
|
18
|
≤4
|
48.86
|
|
400×15
|
15
|
73
|
18
|
51.5
|
||
|
400×16
|
16
|
74
|
18
|
54.7
|
||
|
430×14
|
430
|
14
|
76.5
|
19.5
|
≤4
|
70.6
|
|
430×15
|
15
|
77.5
|
19.5
|
73.9
|
||
|
430×17
|
17
|
79.5
|
19.5
|
80.7
|
||
|
430×19
|
19
|
81.5
|
19.5
|
87.4
|
||
|
430×20
|
20
|
82.5
|
19.5
|
90.8
|
||
Standards and Classifications
| Size(mm) | HP80-HP430 |
| Standard: | EN10067:1997 |
| Grade: | A,B,D,E,AH32,AH36,DH32,DH36,EH32,EH36 |
| S235JR, S235J0, S235J2 | |
| S275JR, S275J0, S275J2 | |
| S355JR, S355J0, S355J2, S355K2 | |
| Certification: | ABS, CCS,LR,KR,NK,RINA,BV,DNV-GL,RMRS |
| CE Certification | |
| Length: | 6m-20m, according to customer’s request |
| Application: | Hull Structure , Bridge Structure, Offshore Platform |
Product Display
Packing & Delivery
Shipping By Sea
1. Standard packaging
2. Packaging according to customer requirements
