The S355JR carbon steel plate sheet steel rolling size

Oxygen (O) is a harmful element in steel such as S355JR carbon steel plate sheet. Although manganese, silicon, iron and aluminum are added to deoxidize the steel at the end of steelmaking, they can not be removed completely. During the solidification of molten steel, the reaction of oxygen and carbon in the solution will produce carbon monoxide, which can cause bubbles. Oxygen mainly exists in the form of FeO, MnO, SiO2, Al2O3 and other inclusions in the steel, which reduces the strength and plasticity of the steel. Especially, it has serious influence on fatigue strength and impact toughness.

Three advantages of semi-endless rolling technology: 1. The limit specification of Q345B steel is expanded from 1.5 mm × 1300 mm to 1.5 mm × 1600 mm. 2. the semi-endless rolling technology can effectively reduce the fluctuations in the temperature, size, and shape control accuracy of the strip head and tail. 3. The different parts of the strip steel S355JR carbon steel plate sheet produced by semi-endless rolling have uniform structure and mechanical properties, the yield strength fluctuation is less than 40 MPa, and the tensile strength fluctuation is less than 20 MPa.

In these countries, the impact of the epidemic in South Korea is relatively serious, and in other countries, the current epidemic control is more appropriate. However, it is understood recently that the epidemic control in South Korea has begun to show a positive trend, and the impact of the epidemic will gradually slow down in the future. Therefore, as far as the direct export of S355JR carbon steel plate sheet and so on steel is concerned, the overall impact is relatively limited.

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