I-beam steel
What is the Difference between H-beam Steel and I-Beam Steel?
Many people think that “H-beam steel” and “I-beam steel” are different names for the same kind of steel in different countries, in fact, this understanding is wrong, H-beam steel and I-beam steel are different from the shape.
I-beam steel
I-beam steel, as the name indicates, is a “I” type section steel, upper and lower flange inner surface inclination, generally 1:6, making the flange thin outside and thick inside, so the cross-section characteristics of I-steel in the two main planes are huge difference, it is difficult to play the strength characteristics of steel in the application. Although there are thickened I-beam steel on the market, the structure of I-beams has determined its torsional performance.
I-steel is mainly divided into ordinary I-steel, light I-steel and wide flange I-steel. According to the height ratio of flange and web, it is divided into wide, medium and narrow wide flange I-beams. The specifications of the first two are 10-60, that is, the corresponding height is 10-60cm.
H-beam steel
H-beam steel is a widely used profile in today’s steel structure buildings, and it has many differences compared with I-beam steel. The first is the flange, and the second is that the inner surface of the flange has no inclination, and the upper and lower surfaces are parallel. The section characteristics of H-beam steel are obviously better than those of traditional I-beams, channel steel and Angle steel.
H-beam steel is an economical section and high-efficiency profile with more optimized cross-sectional area distribution and a more reasonable strength-to-weight ratio. It is named because its section is the same as the English letter “H”. Since all parts of H-beam steel are arranged at right angles, H-beam steel has the advantages of strong bending resistance in all directions, simple construction, cost saving and light structural weight, and has been widely used.
The section of I-beam steel is good for direct pressure and tensile resistance, but the section size can not be torsional resistance because the wing plate is too narrow. H-beam steel on the contrary, both have advantages.
The difference between H-beam steel and I-beam steel
1. Size
Whether the I-beam steel is ordinary or light, because the section size is relatively high and narrow, the moment of inertia of the two main axes of the section is large, so it can generally only be directly used in the web plane of the bending members or it is composed of lattice stress members. It is not suitable for axial compression members or in the perpendicular to the web plane and bending, which makes it have great limitations in the application range.
2. Shape
H-beam steel is an efficient and economical cutting profile (there are other cold thin-wall steel, pressed steel, etc.), because of the reasonable cross-section shape, they can make the steel more efficient and improve the bearing capacity. Unlike the ordinary I-beam steel, the flange of the H-beam steel is widened, and the inner and outer surfaces are usually parallel, which can facilitate the connection of high-strength bolts and other members. Its size constitutes a reasonable series, complete models, easy to design selection (in addition to the crane beam with I-beam steel).
3. Flange
The flange of H-beam steel is equal thickness, there are rolled sections, and there are combined sections of 3 plates welded together. I-beams are rolled sections, due to poor production technology, the inner edge of the flange has a 1:10 slope. The rolling of H-beam steel is different from ordinary I-beam steel with only one set of horizontal rolls. Because of its wide flange and no inclination (or small inclination), it is necessary to add a set of vertical rolls for rolling at the same time. Therefore, its rolling process and equipment are more complex than ordinary rolling mills.
4. Use
The side length of the I-beam steel is small, the height is large, and it can only withstand the force in one direction. H-beam steel groove is deep and thick, and can withstand forces in two directions. With the development needs of steel structure buildings, only I-steel is not available, that is, thickening I-beam steel for load-bearing columns is easy to lose stability. I-beam steel can only be used for beams, while H-beam steel can only be used for the load-bearing columns of the structure.
5. Weight
H-beam steel is a kind of economic section steel with better mechanical properties than I-steel, because its section shape is the same as the English letter “H”. The flange of hot-rolled H-beam steel is wider than that of I-beam steel, the lateral stiffness is larger and the bending resistance is stronger. Under the same specifications, H-beam steel has lighter lineweight than I-beam steel.
The scope of application of H-beam steel and I-beam steel
I-beam steel
Ordinary I-beam steel and light I-beam steel, due to the relatively high and narrow section size, the moment of inertia of the two main axes of the section is relatively different, which makes it have great limitations in the application range. The use of I-beam steel should be selected according to the requirements of the design drawings.
H-beam steel
H-beam steel is a kind of economical section steel, widely used in industry, construction, Bridges, oil drilling platforms and other aspects, but also mainly used in industrial and civil structures of beams and columns.
HW, HM, HN H is the common name for H-beam steel, H-beam steel is welded, HW, HM, HN is hot rolled.
HW is H-beam steel height and flange width is basically equal, mainly used in reinforced concrete frame structure column steel core column, also known as rigid steel column, mainly used in steel structure column.
HM is H-beam steel height and flange width ratio of approximately 1.33-1.75, mainly in steel structures: used as steel frame column, in the framework structure under dynamic load used as frame beam. For example, device platform.
HN is H-beam steel height and flange width ratio is greater than or equal to 2, the use of I-beam steel is equivalent to HN steel.
