What Grade structural member steel use in Canada for low temperatures and US equivalent grade?

In Canada, structural steel used for low temperatures is typically designated as S355 or S420, which are part of the Canadian Standards Association (CSA) standards. These grades are designed to maintain their toughness and strength in cold conditions. The US equivalent grades for these would generally be ASTM A992 or A572, depending on the specific application and requirements. When working in low-temperature environments, it's essential to consult the specific codes and standards applicable to the project.