Are HSS (Hollow Structural Sections) hot rolled?

HSS, or Hollow Structural Sections, are typically manufactured through a process known as cold forming rather than hot rolling. While some HSS can technically be made from hot-rolled steel, the standard practice in the industry is to produce HSS by cold forming steel plates or sheets into the desired hollow shape. This method provides specific advantages, such as improved dimensional accuracy and surface finish.

It's essential to understand that hot-rolled steel generally refers to the process of rolling steel that has been heated above its recrystallization temperature. While both methods can create structural steel shapes, HSS is predominantly identified with the cold-forming process. Therefore, saying HSS is hot rolled does not align with the manufacturing practices commonly used for these structural sections.

Considering the other options:

• The "true" statement does not hold as HSS are not typically hot rolled.
• "Depends on the application" is vague and does not accurately reflect standard practice, as HSS are not widely produced by hot rolling for any application.
• "Only specific types are" suggests that there would be exceptions, which is misleading in the context of HSS as a category.

Overall, HSS are fundamentally associated with cold-formed methods rather than being hot rolled.