Question

The histori of bulding in iron and steel is hardly more that a hundred years old.The construction of the first railways has given considerable impetus to cast and wrought iron production.The commonest quality of steel for building construction is that known as mild steel.Several qualities of high tensile steel are widely used every wtere.They vary both in their chemical composition and their mechanical properties.The elements used for most steel structures are the hot-rolled sections,prodused in a great variety by the rolling mills.

Answer 1

Ответ:

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Объяснение:

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Answer 2

The history of building with iron and steel indeed dates back to the 19th century and has evolved significantly since then. Here's a brief overview:

1. Early Use of Iron: While the use of iron in construction can be traced back to ancient civilizations like the Romans, where they used wrought iron for various purposes, the widespread use of iron in large-scale construction began in the 19th century.

2. Railway Construction: The construction of the first railways in the early 19th century played a pivotal role in the development of iron and steel production. Iron was initially used for the tracks, bridges, and locomotives. This significantly increased the demand for both cast and wrought iron.

3. Introduction of Steel: The development of the Bessemer process in the mid-19th century and later the open-hearth process allowed for the mass production of steel. Steel quickly gained popularity in construction due to its superior strength and durability compared to iron.

4. Mild Steel: Mild steel, also known as low carbon steel, became the common choice for building construction. It has a relatively low carbon content, making it easier to work with and weld while providing sufficient strength for many construction applications.

5. High Tensile Steel: Over time, the demand for stronger and more resilient materials led to the development and use of high tensile steel. These steel alloys have higher carbon content and other alloying elements, resulting in increased strength and improved mechanical properties.

6. Variety of Steel Products: Steel production expanded to include various forms such as hot-rolled sections, which are produced in rolling mills. These sections come in a wide range of shapes and sizes, making them versatile for construction projects.

7. Modern Steel Construction: Today, steel remains a vital material in construction, used in a multitude of applications, including skyscrapers, bridges, industrial facilities, and residential buildings. Engineers and architects continue to push the boundaries of what is possible with steel through innovative design and construction techniques.

In summary, the history of building with iron and steel began in the 19th century, driven by the construction of railways and advancements in steel production processes. From mild steel to high tensile steel, these materials have revolutionized construction by providing strength, durability, and versatility in various architectural and structural applications.