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CSA G40.21 HSS

CSA G40.21 is the Canadian specification for rolled or welded structural-quality steel. Atlas Tube produces hollow structural sections (HSS) to this spec in round, square and rectangular shapes and a range of sizes and wall thicknesses.

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The Canadian HSS for General Structural Purposes

CSA G40.21 HSS are welded or seamless round, square, rectangular and special-profile structural tubing products.

There are two types of HSS in accordance with this spec — Class C and Class H. Atlas Tube produces both. Class C HSS are cold-formed either through a seamless process or an automatic electric-welding process producing a continuous weld. Class H HSS are also cold-formed, but then heat-treated in order to stress-relieve the product. Tensile samples (heat-treated with the load) are pulled, and the results are recorded for each heat number, tube size and gauge. The material is then checked for straightness and surface condition.

Advantages of CSA G40.21 HSS from Atlas Tube

Quality
Increased axial capacity in accordance with CSA S16-14
Aesthetically pleasing, uniform shape
Comes with a material test report (MTR)
Ease
Easy to get; produced every 2 weeks in our Harrow plant
Easy to weld in the shop or in the field
Less clean-up and painting required because the surface area is smaller than that of open sections
Savings
Class H: Savings in mass up to 20%, compared to Class C and ASTM A500 HSS
Jumbo Sizes
From 18" to 22" square
Wall thicknesses up to 0.875"
Exclusively from Atlas Tube

Quick Links

CSA G40.21 50W or Metric 350W Class H Fact Sheet Steel Grade Comparison: ASTM A500 vs. CSA G40.21 CSA G40 Imperial Section Properties – Squares CSA G40 Imperial Section Properties – Rectangles CSA G40 Imperial Section Properties – Rounds CSA G40 Metric Section Properties – Squares CSA G40 Metric Section Properties – Rectangles CSA G40 Metric Section Properties – Rounds Introduction to HSS Connections (Hollow Structural Sections) Video HSS Connections: The Top Things You Should Know Video, Part 1 HSS Connections: The Top Things You Should Know Video, Part 2 HSS Availability Chart

Brochure

Learn more about Atlas Tube’s HSS manufacturing capabilities.
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PRODUCT FEATURE

Looking for American HSS specs?
Learn about ASTM A500

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Chicago, IL 60633
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  • Products
    • ASTM A500 HSS
    • ASTM A1085 HSS
    • Jumbo HSS
    • CSA G40.21 HSS
    • ASTM A252 Steel Pipe Piles
    • ASTM A513 Mechanical Tubing
    • Epox Z Kote® Powder Primed Tubing
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    • American Metal
    • Management Team
    • Atlas Tube History
    • AIM
    • Mill Locations
    • Stocking Partners
    • Certifications & Affiliations
    • Careers
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