CSA G40.21· Canada

300W

Canada's most common merchant structural grade: 300 MPa (44 ksi) yield, 65–90 ksi tensile.

Compared with S275 on its equivalents table.

Nominal thicknessmm

Yield strength ReH: ≥ 300MPa
Single source≤ 63.5 mm · up to 2½ in.
Tensile strength Rm: 450–620MPa
Single source
Elongation after fracture A: ≥ 20%
Single sourcelongitudinal, in 8 in.

All values

Strength

Yield strength ReH

Upper yield strength guaranteed by the product standard (minimum).

Condition	Value	Evidence
	≥ 300MPa	Single source
	≥ 275MPa	Single source

Tensile strength Rm

Ultimate tensile strength. Product standards give a range or a minimum.

Condition	Value	Evidence
	450–620MPa	Single source

Ductility

Elongation after fracture A

Minimum elongation; depends on gauge length and test direction.

Condition	Value	Evidence
	≥ 20%	Single source

Chemical composition

Show on the periodic table

44W (300W), heat analysis, % by mass, maximum

Element	Applies to	Max %	Evidence
C	all thicknesses	0.22	Single source
Mn	all thicknesses	1.50	Single source
P	all thicknesses	0.040	Single source
S	all thicknesses	0.050	Single source
Si	all thicknesses	0.40	Single source

Listed as equivalent to

S275 (EN 10025-2:2019) — Yield 300 MPa (44 ksi), above S275; tensile 450–620 MPa. 44W is the imperial name.

Sources here are public pages that reproduce CSA G40.21. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence.