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Steel rails are the primary component of railway tracks, providing a smooth and durable surface for trains to run on. The lifespan of steel rails depends on various factors, including the quality of the steel, the weight of the trains that run on them, and the environmental conditions they are exposed to. In this article, we will explore the different factors that affect the   lifespan of steel rails   and give a rough estimate of how long they can last.   Quality of Steel The quality of the steel used to make the rails is one of the most critical factors affecting their lifespan. Higher-quality steel tends to have better resistance to wear and tear, and it can withstand heavy loads for a longer time. Steel rails are made of various grades of steel, such as R260, R350, and R400. These grades refer to the minimum tensile strength of the steel, which is the amount of stress it can handle before breaking.   Rails made of R260 steel, which has a tensile strength of 260 megapascals (MPa), a

H-beams and   I-beams  are two common types of structural steel beams used in construction, but they have some differences in terms of their shape, strength, and applications. Understanding the differences between these two types of beams is important for engineers, architects, and construction professionals who need to choose the right beam for a given project. In this article, we will explore the differences between H-beams and I-beams.   I-Beams I-beams, also known as W-beams, is shaped like an "I" when viewed from the end. They have tapered flanges, meaning that the width of the flange decreases from the web to the edge of the beam. The flanges also have a slightly different shape compared to H-beams, with a slope on the inner edge and a flat surface on the outer edge. I-beams are commonly used in construction for their strength and versatility, as they can be used in a variety of applications such as building frames, bridges, and towers.   Hot rolled mining I beam  can b