Compare / 300W vs S275

300W vs S275

CSA G40.21 · Steel

300W

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

EN 10025-2:2019 · Steel

S275

Structural steel with 275 MPa minimum yield up to 16 mm, 410–560 MPa tensile.

ApproximateYield 300 MPa (44 ksi), above S275; tensile 450–620 MPa. 44W is the imperial name.

Mechanical

Property	Condition	300W	S275	Difference
Yield strength ReH	t = 16 mm	≥ 300MPa1	≥ 275MPa3	−8.3 %
	t = 40 mm	≥ 300MPa1	≥ 265MPa3	−12 %
	t = 63 mm	≥ 300MPa1	≥ 255MPa2	−15 %
	t = 63.5 mm	≥ 300MPa1	≥ 245MPa2	−18 %
	t = 80 mm	≥ 275MPa1	≥ 245MPa2	−11 %
	t = 100 mm	≥ 275MPa1	≥ 235MPa2	−15 %
	t = 101.6 mm	≥ 275MPa1	≥ 225MPa2	−18 %
Tensile strength Rm	t = 3 mm	450–620MPa1	430–580MPa1	−4.4 %
	t = 100 mm	450–620MPa1	410–560MPa3	−8.9 %
	t = 150 mm	450–620MPa1	400–540MPa1	−11 %
	t = 250 mm	450–620MPa1	380–540MPa1	−16 %

Rows are matched by condition (thickness band, temperature, product form). A dash means the grade has no sourced value for that condition. Differences are S275 relative to 300W; for ranges the lower bound is compared.