Steels that are open at both ends and have a hollow section, and whose length is larger than the circumference of the section, can be called steel pipes. When the length is small compared to the perimeter of the section, it can be called a pipe section or a tubular fitting, which are all in the category of pipe products.
For more than sixty years, architects have used stainless steel to build cost-effective permanent buildings. Many existing buildings fully illustrate the correctness of this choice. Some are very entertaining, such as the Chrysler Building in New York City. But in many other applications, the role of stainless steel is not so compelling, but it plays an important role in the aesthetics and performance of buildings. For example, since stainless steel is more wear resistant and indent resistant than other metal materials of the same thickness, it is the material of choice for designers when constructing sidewalks in places with large population movements.