What is an I-Beam?
An i-beam, also known as universal beam, is a long steel with I-shaped section. I-beam can be divided into ordinary I-beam and light I-beam. It is a steel with I-shaped section.
CLASSIFICATION OF I-BEAMS
I-beams are mainly divided into ordinary I-beams, light I-beams and wide flange I-beams. According to the height ratio of flange to web, they are divided into wide, medium and narrow flange I-beams. The specifications of the former two are No. 10-60, that is, the corresponding height is 10 cm-60 cm. Under the same height, light I-beams have narrow flange, thin web and heavy web Light weight. Wide flange I-beam, also known as H-beam, is characterized by two parallel legs and no inclination inside legs. It belongs to economic section steel and is rolled on four high universal mill, so it is also known as “universal I-beam”. Ordinary I-beam and light I-beam have formed national standard.
PASS DESIGN OF I-BEAM
The specification of I-beam is expressed by the centimeter value of waist width. For example, the waist width of No.10 I-beam is 10cm. The types of I-beam are hot-rolled common I-beam, light I-beam and wide parallel leg I-beam (H-beam). The waist width of Chinese hot-rolled common I-beam is 100-630mm, expressed as no.10-no.63, and the inclination of inner wall of leg is 1:6. The pass system of rolling I-beam has straight pass In addition, special rolling method can be used for I-beam.
- (1) Direct rolling pass system refers to the pass system in which the two open legs of I-beam pass are on the same side of roll axis at the same time and the waist is parallel to roll axis.
- It has the advantages of small axial force, small axial movement, no need of working inclined plane, and small occupation of roll body length by pass.
- (2) Cross rolling pass system. This pass system means that the two open legs of I-beam pass are not at the same side of the waist at the same time, and there is an angle between the waist and the horizontal axis.
- (3) Mixed pass system. According to the characteristics of rolling mills and products, in order to give full play to the advantages and overcome the disadvantages of their respective systems, the mixed pass system is often used, that is, the combination of more than two systems. For example, the straight leg cross rolling pass system is used for the finished hole and the front hole of the finished product, and the bending leg cross rolling system is used for other passes; or the direct rolling system is used for the rough rolling hole, and the direct rolling system is used for the last 3-4 finishing rolling holes Leg oblique hole, etc.
- (4) Special rolling method. For some reason, when it is difficult to produce the required I-beam by the usual rolling method, the special rolling method can be used to make full use of the skills of uneven deformation and pass design. For example, when the billet section is narrow and the I-beam is required to be rolled wider, the wave rolling method can be used; when the billet is wide and the I-beam is required to be rolled smaller, the negative rolling method can be used Wide spread rolling, etc.
APPLICATION CHARACTERISTICS OF I-BEAM
I-shaped steel, whether ordinary or light, can only be directly used for bending members in the web plane or forming lattice members because of its relatively high and narrow cross-section size and large difference in inertia moment between the two principal axes of the section. It is not suitable for axial compression members or bending members perpendicular to the web plane, which makes it widely used I-beam is widely used in architecture and other metal structures.
Ordinary I-beam and light I-beam are relatively high and narrow in cross-section size, so there is a big difference in inertia moment between two main shafts of cross-section, which limits their application scope. The use of I-beam should be based on the requirements of design drawings.
The selection of I-beam in structural design should be based on its mechanical properties, chemical properties, weldability and structural size.
SPECIFICATION AND MODEL OF I-BEAM
The specification is expressed by height × leg thickness × waist thickness, and the number can also be used to indicate the main size of the specification. For example, 18 I-steel is 18 cm high. If the height of I-steel is the same, angle code a or B or C can be added after the number, such as 36a, 36B, 36C, etc. it can be divided into ordinary I-steel, light I-steel and wide flange I-steel. According to the height of flange and web plate The former two types of I-beams are 10-60, that is, the corresponding height is 10-60 cm.
The expression method of I-beam size: h × b × d
Shape/Dimensions of I-Beams
| Dimensions（mm） | Cross-sectional | Unit mass | ||||
| H×B | t1 | t2 | r1 | r2 | area(cm3） | (kg/m) |
| 150×125 | 8.5 | 14 | 13 | 6.5 | 46.15 | 36.2 |
| 180×100 | 6 | 10 | 10 | 5 | 30.06 | 23.6 |
| 200×100 | 7 | 10 | 10 | 5 | 33.06 | 26 |
| 200×150 | 9 | 16 | 15 | 7.5 | 64.16 | 50.4 |
| 250×125 | 7.5 | 12.5 | 12 | 6 | 48.79 | 38.3 |
| 250×125 | 10 | 19 | 21 | 10.5 | 70.73 | 55.5 |
| 300×150 | 8 | 13 | 12 | 6 | 61.58 | 48.3 |
| 300×150 | 10 | 18.5 | 19 | 9.5 | 83.47 | 65.5 |
| 300×150 | 11.5 | 22 | 23 | 11.5 | 97.88 | 76.8 |
| 350×150 | 9 | 15 | 13 | 6.5 | 74.58 | 58.5 |
| 350×150 | 12 | 24 | 25 | 12.5 | 111.1 | 87.2 |
| 400×150 | 10 | 18 | 17 | 8.5 | 91.73 | 72 |
| 400×150 | 12.5 | 25 | 27 | 13.5 | 122.1 | 95.8 |
| 450×175 | 11 | 20 | 19 | 9.5 | 116.8 | 91.7 |
| 450×175 | 13 | 26 | 27 | 13.5 | 146.1 | 115 |
| 600×190 | 13 | 25 | 25 | 12.5 | 169.4 | 133 |
| 600×190 | 16 | 35 | 38 | 19 | 224.5 | 176 |
| Reference | ||||||
| Second moment | Radius of gyration | Section | ||||
| of area（cm4） | of area（cm） | modulus （cm3） | ||||
| lx | ly | ix | iy | zx | zy | |
| 1,760 | 385 | 6.18 | 2.89 | 235 | 61.6 | |
| 1,670 | 138 | 7.45 | 2.14 | 186 | 27.5 | |
| 2,170 | 138 | 8.11 | 2.05 | 217 | 27.7 | |
| 4,460 | 753 | 8.34 | 3.43 | 446 | 100 | |
| 5,180 | 337 | 10.3 | 2.63 | 414 | 53.9 | |
| 7,310 | 538 | 10.2 | 2.76 | 585 | 86 | |
| 9,480 | 588 | 12.4 | 3.09 | 632 | 78.4 | |
| 12,700 | 886 | 12.3 | 3.26 | 849 | 118 | |
| 14,700 | 1,080 | 12.2 | 3.32 | 978 | 143 | |
| 15,200 | 702 | 14.3 | 3.07 | 870 | 93.5 | |
| 22,400 | 1,180 | 14.2 | 3.26 | 1,280 | 158 | |
| 24,100 | 864 | 16.2 | 3.07 | 1,200 | 115 | |
| 31,700 | 1,240 | 16.1 | 3.18 | 1,580 | 165 | |
| 39,200 | 1,510 | 18.3 | 3.6 | 1,740 | 173 | |
| 48,800 | 2,020 | 18.3 | 3.72 | 2,170 | 231 | |
| 98,400 | 2,460 | 24.1 | 3.81 | 3,280 | 259 | |
| 130,000 | 3,540 | 24.1 | 3.97 | 4,330 | 373 | |
- 1. When ordering, please specify actual dimensions (H×B×t1/t2×length).
- 2. The sizes marked * are not constantly being rolled, so please inquire when ordering.
- 3. Please talk to us in advance about turnaround times and specifications (bending, shot blasting, etc.).
- 4. Standard length is 6 m or more with 500 mm pitch up to 24 m, but for orders over 15 m, please talk to us before ordering.
Post time: Apr-15-2021