What are the advantages of hot-rolled H-shaped steel?

Shandong Jiuzhou First Metal Materials Co., Ltd. First of all, hot-rolled H-shaped steel has a high structural strength. Compared with I-shaped steel, its cross-sectional modulus is large. Under the same load requirements, it can save 10-15% of metal. Design is agile and rich. With the same beam height, the steel structure gap is 50% larger than the concrete structure gap, and the construction arrangement is more flexible.

Hot-rolled H-shaped steel is lighter in weight, and the weight of concrete structure is lighter than that of concrete structure What are the advantages of hot-rolled H-shaped steel?. The reduction in structural weight reduces the internal force of the structural design, which can make the foundation of the building structure lower, lighter construction, and reduce cost. Compared with concrete structures, the cross-sectional area of ​​steel structure columns is smaller, which can supplement the building's useful area. Depending on different construction methods, the usable area can be increased by 4-6%.

Steel structures with high structural stability are mainly hot-rolled H-shaped steels, with appropriate structural principles, good plasticity and flexibility, and high structural stability. It is suitable for building structures with large vibration and attack loads, and has strong resistance to natural disasters, especially for building structures with multiple earthquakes. According to statistics, in destructive earthquakes above magnitude 7, steel structure buildings dominated by H-shaped steel have low disaster rates.

In the application of hot-rolled H-shaped steel, problems with the steel themselves often occur, such as peeling and pitting on the appearance, which seriously affects the construction project. Therefore, in order to reduce this situation and improve the quality of hot-rolled H-shaped steel, we need to understand the reasons for this situation.

If there are no obvious cracks and continuous depressions on the surface of the hot-rolled H-shaped steel, it is because the scale on the surface of the slab before rolling after heating has not been cleaned. There are pits on the surface because there are many bubbles and scales on the surface of the slab. Therefore, during the rolling process, the dephosphorization process must be carried out strictly and conscientiously, so that the occurrence of pitting corrosion will be reduced. Looking at the metallographic structure, the tissue in the depression area is the same as the general tissue and has no decarbonization.

Hot-rolled H-shaped steel is mainly ferrite and pearlite. However, surface peeling is mainly caused by surface peeling of the slab. Through metallographic observation, it can also be seen that the crack does not extend from the surface, but exists in the near-surface of the steel, and the internal impurities are steel slag. The problems in the casting of small square billets are mainly manifested in defects such as subcutaneous bubbles near the surface, pinholes on the surface, and slight scarring.

According to Shandong Jiuzhou First Metal Materials Co., Ltd., it can be seen from the above that the cause of the surface problem of H-shaped steel is first of all the defects of the slab, and secondly the heating and descaling effect of the slab, which leads to the surface scale pressing. Therefore, to solve the problem, we can start with smelting and rolling. During the smelting process, we must pay attention to the moisture, control the degree of roasting of raw materials, maintain a balance between dry and wet, and prevent the surface pinholes and subcutaneous bubbles from appearing on the slab. During the rolling process, in order to better remove phosphorus, the appropriate water pressure must be adjusted, and the temperature range must be adjusted to the upper limit during operation. After doing these things, the supply and demand of the smelting and rolling processes will be more stable, and the surface quality and internal quality of the casting billet have greatly changed, making it smoother and better.