The grade of steel used in hollow sections (HSS) can vary based on the intended application and the standards or specifications that need to be met. HSS are typically made from mild carbon steel or low-alloy steel. The specific grade of steel used for HSS depends on factors such as the structural requirements, load-bearing capacity, corrosion resistance, and other engineering considerations. Commonly used steel grades for HSS include:
ASTM A500 Grade B or C: ASTM A500 is a standard specification for cold-formed welded and seamless carbon steel structural tubing. Grade B and Grade C are common choices for HSS in the United States. Grade B has a minimum yield strength of 46,000 psi (315 MPa), while Grade C has a minimum yield strength of 50,000 psi (345 MPa).
EN 10219: In Europe, HSS are often manufactured according to the EN 10219 standard, which specifies technical delivery conditions for cold-formed welded structural hollow sections of non-alloy and fine grain steels. Different subgrades are defined in this standard based on their yield strength and chemical composition.
Other International Standards: Depending on the region and project specifications, other international standards, such as ISO 657-11 for carbon and low-alloy steel, may be used to specify the grade of steel for HSS.
High-Strength Low-Alloy (HSLA) Steel: In applications requiring higher strength, HSS may be made from HSLA steel grades that offer improved strength and toughness properties.
