Final answer:
Steels meeting any grade of CAN/CSA-40.21 must also meet the requirements of ASTM A36, which specifies carbon structural steel for construction uses.
Step-by-step explanation:
Steels meeting any grade of CAN/CSA-40.21 must also meet the requirements of ASTM A36. The grades outlined in CAN/CSA-40.21 specify the chemical and physical properties of structural steel used in Canada. The ASTM A36 standard specifies the requirements for carbon structural steel used in the construction of bridges and buildings, and is widely recognized in the United States. Both of these standards ensure that the steel has certain minimum strengths and is suitable for welding and other forms of fabrication. It's important to adhere to these standards to ensure the quality and safety of the steel in structural applications.