Steel grades across countries: 44W vs A36, CSA vs ASTM vs EN

Is 44W the same as A36?

Close enough to buy, not identical on paper. A36 is the US name for everyday structural steel and 44W is the Canadian one, and the Canadian spec is the stronger of the two: 44 ksi minimum yield against A36's 36 ksi. Most merchant bar in North America is rolled to pass both, and the mill paperwork carries both names.

S275 is Europe's name for the same job, with the yield written in metric: 275 MPa, about 40 ksi. Three standards bodies, three naming habits, one bar doing one job: frames, gates, brackets, and general fab. This guide is the decoder. If you just want to know which bar to buy and weld this weekend, our 1018 vs A36 vs 1045 guide settles that in a page.

Who writes the rulebooks, and what do the names mean?

Three bodies. CSA Group writes Canada's structural steel standard, CSA G40.21 (its sibling G40.20 holds the general requirements). ASTM International writes the US specs, A36 among them. CEN, Europe's standards body, writes the EN 10025 series that covers S235, S275, and S355. Each name is a tiny spec sheet once you can read it:

Canada's letters go further: WT adds tested low-temperature toughness, A and R mark weathering steels, and Q means quenched and tempered. Every imperial grade also has a metric twin (44W/300W, 50W/350W) because the standard kept both names when Canada went metric in the 1970s. Racks and mill certs here still mostly speak imperial. One more decoder note: beams and hollow sections in Canada usually spec 350W, one family up, while the merchant bar on supplier racks is 44W country.

How do 44W, A36, and S275 compare on the numbers?

On minimum yield, 44W asks the most: 44 ksi (300 MPa), against 36 ksi (250 MPa) for A36 and 275 MPa (about 40 ksi) for S275. Here's the full picture in both unit systems:

Those are spec minimums for the bar and plate sizes a small order actually uses; the yield floor slides down a little on very thick sections in all three systems. Read the yield row and the honest point falls out: 44W meets or beats A36 on strength, so a 44W bar covers an A36 callout without apology.

Now the caution. "Equivalent" in every cross-reference table means commonly substituted, not identical. The chemistry windows differ: S275JR caps carbon near 0.21% where A36 allows roughly 0.26%, and the European grade proves impact toughness while A36 never has to. So the swap rule is two-sided. On stamped, engineered work, substitution is the engineer's call, in writing. On general fab (gates, racking, brackets, repairs), swapping between these three is everyday shop reality.

Why does every country have its own grades?

Because the standards grew up with national mills, and each got rewritten in a national moment. A36 arrived in 1960 as American fabrication moved from rivets to welding, and it pushed the riveted-era A7 spec into retirement by the late 1960s. Canada made weldability the headline: the W literally stands for weldable, and metrication added the MPa twin names instead of a new standard. Europe consolidated in the 1990s, when CEN folded the old national grades (Germany's St37, St44, and St52, Britain's BS 4360 series) into the single EN 10025 family with yield spelled in MPa.

Same physics, different paperwork eras. The three names will never quite merge, which is why a cross-border drawing is a translation job, not a problem.

What does dual certification mean on the mill paperwork?

One bar, several names, proven. A mill rolls a heat of steel, tests it, and certifies it against every spec it clears, so a mill test report often reads A36 and 44W for the same bar. Bolt and bar suppliers say it plainly: most of the merchant bar rolled in North America is certified to both. The MTR lists each standard the heat passed, with the measured chemistry and strength beside them.

For you, that means the name on a drawing rarely blocks a small order; the bar on the rack usually already holds the cert the drawing wants. If the job needs the paper, ask when you order. Here's how MTRs work on small orders, including what's on one and which products carry them.

Do aluminum, stainless, and machining steels play the same game?

Yes, with happier endings. Most non-structural families settled on numbers that travel, so translation is a lookup, not a judgment call:

Two notes from that table. The 1018 row is the honest one: Europe never registered an exact 1018, so a European drawing calls up C15E or a close neighbour, the chemistry windows overlap without matching, and the practical answer at the counter is our 1018 cold finished. The stainless rows explain the fastener aisle: bolts follow ISO 3506 property classes, where A2 is the 304 family, A4 is the 316 family, and the number after the dash (A2-70) is tensile strength in MPa divided by ten. Picking between those two families for your own project is the stainless buying guide's whole job.

What should you do with a foreign-spec drawing at our counter?

Bring the spec, not a guess. Email the drawing or bring it in with the grade callout visible, and we'll translate it against the rack. An A36, S235, or S275 callout lands on 44W, the deepest pile on our carbon rack; as of June 2026, a 12″ piece of 1/8″ x 1/2″ 44W flat bar runs $5.30 CAD, cut free to ±1/8″. An S355 callout starts a 350W/50W conversation: we stock some 50W, the minimum yields sit 5 MPa apart, and your engineer signs off on the swap.

If the job legally needs the exact foreign cert rather than just the strength, that's a sourcing job: send the spec line through a quote request and we'll quote certified material, usually in 2-21 days, MTR included. We've been translating drawings at this counter since 1997. Bring the name, and we'll find the bar.