CSA Standards

The Canadian Standards Association (CSA) (www.csa.ca) provides certification standards for structural steel under the following standards:

CSA G40.20-04, "General requirements for rolled or welded structural quality steel"
This standard sets out the general requirements and related definitions governing the delivery of structural steel conforming to CSA G40.21. These requirements include variations in dimensions, marking, repair of defects, and methods and frequency of testing.

CSA G40.21-04, "Structural quality steel"
This standard sets out various types, grades, strength levels and impact levels of structural steel for general construction and engineering purposes. These types (designated by grade according to MPA or ksi) include the following:

Type G - General Construction Steel
Steels of this type meet specified strength requirements, but not chemical composition requirements. Not all of these steels may be welded satisfactorily under normal field conditions. Rather, these steels are designed for applications involving bolted connections or for welding under carefully controlled shop conditions. Grades include 230G (33G) and 350G (50G).
Type W - Weldable Steel
Steels of this type meet specified strength requirements and are suitable for general welded construction where notch toughness (impact properties) at low temperatures is not a design requirement. Applications include buildings and compression members in bridges. Grades include 260W (38W), 300W (44W), 350W (50W), 380W (55W), and 480W (70W).
Type WT - Weldable Notch Tough Steel
Steels of this type meet specified strength requirements and impact (Charpy V-Notch) requirements. These steels are therefore suitable for welded construction where notch toughness (impact properties) at low temperatures is a design requirement. Applications include primary tension members in bridges. Grades include 260WT (38WT), 300WT (44WT), 350WT (50WT), 380WT (55 WT), and 480WT (70WT).
Type R - Atmospheric Corrosion-Resistant Steel
Steels of this type meet specified strength requirements and are approximately four times more resistant to atmospheric corrosion than plain carbon steels (whose copper content does not exceed 0.02%). Type R steels are often left in an unpainted state. Applications include siding and light structural members where notch toughness (impact properties) at low temperatures is not a design requirement.
Type A - Atmospheric Corrosion-Resistant Weldable Steel
Steels of this type meet specified strength requirements and are approximately four times more resistant to atmospheric corrosion than plain carbon steels (whose copper content does not exceed 0.02%). These steels are suitable for welded construction where notch toughness (impact properties) at low temperatures is not a design requirement. Like type R steels, these steels are often used in an unpainted condition. Applications for these steels are similar to those for type "W" steels. Grades include 350A (50A) and 480A (70A).
Type AT - Atmospheric Corrosion-Resistant Weldable Notch Tough Steel
Steels of this type meet specified strength requirement and impact (Charpy V-Notch) requirements. In addition, these steels are approximately four times more resistant to atmospheric corrosion than plain carbon steels (whose copper content does not exceed 0.02%). These steels are suitable for welded construction where notch toughness (impact properties) at low temperatures is a design requirement. These steels are often used in an unpainted condition. Applications include primary tension members in bridges. Grades include 350AT (50AT) and 480AT (70AT).
Type Q - Quenched Low Alloy Steel
Steels of this type meet specified strength requirements. These steels may be readily welded, but the welding and fabrication techniques are of fundamental importance and must not adversely affect the properties of the steel. For example, it is important to minimize the heat-affected zone (HAZ). Applications include bridges, trailer bodies, construction equipment, forestry equipment, mining equipment and low to moderate wear plates. Grades include 700Q (100Q). Our HS 100 grade includes steels of this type.
Type QT - Quenched and Tempered Low Alloy Notch Tough Steel
Steels of this type meet specified strength requirements and impact ("Charpy V-Notch") requirements. These steels provide good resistance to brittle fractures and are suitable for structures where notch toughness at low temperatures is a design requirement. These steels may be readily welded, but the welding and fabrication techniques are of fundamental importance and must not adversely affect the properties of the steel. For example, it is important to minimize the heat-affected zone (HAZ). Applications include bridges, trailer bodies, construction equipment, forestry equipment, mining equipment and low to moderate wear plates. Grades include 700QT (100QT). Our HS 100 grade includes steels of this type.
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