Steel

Minimum yield 235–300 MPa. Ordinary carbon steel, easy to weld, cut and form — and its counterparts in other countries.

Grade	Standard	Yield strength at 10 mm	Tensile strength	Closest to	Evidence
300W Canada's most common merchant structural grade: 300 MPa (44 ksi) yield, 65–90 ksi tensile.	CSA G40.21	≥ 300 MPa1	450–620 MPa1	S275Approximate	Single source 9

S355 and every grade the world lists against it, compared on what each standard guarantees. Some “equivalents” fall short; their yield shows it.

Grade	Standard	Yield strength at 10 mm	Tensile strength	Closest to	Evidence
350W Canada's standard weldable structural grade: 350 MPa (50 ksi) yield, 450–650 MPa tensile.	CSA G40.21	≥ 350 MPa2	450–655 MPa2	S355Approximate	Corroborated 2 Single source 7 Disagreements explained 1