Canada has a small group of rebar mills. In its 2026 expiry reviews of anti-dumping measures on concrete reinforcing bar, the Canada Border Services Agency (CBSA) identified five Canadian producers: ArcelorMittal Long Products Canada, Gerdau, AltaSteel, Max Aicher North America and Ivaco Rolling Mills. These mills roll the bar; most contractors buy it through a rebar fabricator or supplier that cuts, bends and delivers it.
Canada's rebar mills
The table summarises the producers named by the CBSA in its October 2026 statements of reasons on rebar, with location details from public sources.
| Producer | Where | Parent | Notes |
|---|---|---|---|
| ArcelorMittal Long Products Canada (AMLPC) | Contrecoeur, Longueuil and Montreal, Quebec | ArcelorMittal (Luxembourg) | One of Canada's largest long-steel producers. Makes regular and weldable rebar from 10M to 55M, high-strength 600W bar, and rebar in coil form. |
| Gerdau | Canadian mills include Whitby, Ontario and a minimill in Selkirk, Manitoba | Gerdau S.A. (Brazil) | Makes a full range of rebar. Gerdau also makes merchant bar, structural shapes and other long products in North America. |
| AltaSteel | Edmonton, Alberta | Kyoei Steel (Japan) | Makes a full range of rebar at its Edmonton facilities, from 100% recycled material according to the company. |
| Max Aicher North America (MANA) | Hamilton, Ontario | Max Aicher Group (Germany) | Supplier of hot-rolled steel bar products, including a full range of rebar. Started in Hamilton in 2010 on mills bought from US Steel. |
| Ivaco Rolling Mills (IRM) | Canada | Heico group | Mainly a wire rod producer; makes small quantities of rebar. |
The CBSA notes that the domestic industry "is comprised of a number of producers, including" these five, so the list is not necessarily exhaustive, and plant capacities and product ranges change over time. If a particular mill's product matters for your job, check its current literature.
All rebar sold for Canadian construction, wherever it is rolled, should meet CSA G30.18, the Canadian standard for carbon-steel reinforcing bars. That is what sets the bar sizes (10M to 55M), the grades (400W, 500W and the R grades) and the minimum properties. Our post on Canadian rebar grades explains what the grades mean.
How rebar is made
Rebar mills typically melt recycled scrap steel in electric arc furnaces (AMLPC also runs direct reduced iron plants), refine it, cast it into billets, then reheat the billets and roll them down into deformed bar. The finishing rolls form the ribs and the rolled-in identification markings.
The output is:
- Straight bar in mill lengths. In Canada the standard mill length is 12 m for 10M and 18 m for 15M and larger. Our post on standard rebar lengths covers what that means for ordering.
- Coiled bar, which AMLPC, for example, makes on its rod mill.
Mills test each heat of steel and document the chemistry and mechanical properties on a mill test certificate, which is how a buyer confirms the bar meets the standard.
Mills, fabricators and suppliers: who sells what
People searching for "rebar manufacturers" usually want one of three different kinds of company.
Mills make the steel and roll straight or coiled bar. They sell in large tonnages, mostly to fabricators and distributors. A mill does not detail your footing, cut your bars to length or bend your stirrups.
Rebar fabricators buy bar from mills and turn it into what your job needs: they detail the bar list and placing drawings from your structural drawings, cut and bend the bars, tag and bundle them by mark, and deliver them to site. Many also place the bar. This is where most commercial and residential rebar is bought. Our post on choosing a rebar fabricator in Ontario covers what to look for, and what rebar fabrication involves explains the process.
Supply yards and retail stores sell straight bar in stock lengths or short pre-cut pieces, plus accessories like chairs and tie wire. They suit small jobs and repairs. Our guide on how to buy rebar in Ontario compares all of these options.
Brand names you may see. Searches for "Nucor rebar Ontario", "Harris rebar", "CMC rebar" or "AGF rebar" are usually looking for a local place to buy fabricated bar rather than a Canadian mill. Nucor, for example, describes itself as the largest rebar fabricator in North America. None of these names appears on the CBSA's 2026 list of Canadian rebar producers, and fabricating shops change hands through acquisitions, so check each company's current website for its Ontario locations and services.
Imported rebar and trade measures
Canadian fabricators and distributors buy both domestic and imported bar. Imports have been a recurring issue for the domestic industry, and Canada has had anti-dumping and countervailing measures on concrete reinforcing bar from a number of countries since the mid-2010s, following inquiries by the Canadian International Trade Tribunal (CITT). In 2026 the CBSA ran expiry reviews of two of those findings, covering rebar from Algeria, Egypt, Indonesia, Italy, Malaysia, Singapore and Vietnam in one review and Oman and Russia in the other. Whether each measure continues is decided through the CBSA and CITT process.
For a contractor, the origin of the bar matters less than whether it meets the specification. Imported bar for Canadian construction still needs to be CSA G30.18 bar in the size and grade on the drawings. If a specification requires domestic steel or a particular grade, make sure your fabricator knows before the order is placed. Trade measures and tariffs can also affect market conditions; our post on steel price increases and tariffs in Canada covers that side.
How to tell who made your bar
Every deformed bar made to CSA G30.18 is rolled with markings that identify:
- The producing mill (a letter or symbol).
- The bar size.
- The grade, where it is marked on the bar.
If you need to confirm what you have on site, read the markings and check them against the mill test certificate for the delivery. If your specification or inspector requires certificates, ask your supplier for them when you order, not after the pour. Our post on how to identify rebar size explains how to read the bar.
Questions to ask about the bar you buy
You rarely get to choose the mill, but you can make sure the bar is right for the job. Before ordering, it is worth asking your supplier:
- Does the bar meet CSA G30.18 in the grade on the drawings? Most work calls for 400W; some designs call for 500W, and the two are not interchangeable without the engineer's approval.
- Is weldable bar needed? If any bars will be welded, the W grades matter. Our post on weldable rebar explains why.
- Are coated or special bars involved? Epoxy-coated, galvanized, stainless and GFRP bar come through different supply chains with their own lead times, so flag them early.
- Will certificates be available? If the specification, the engineer or an inspector wants mill test certificates, say so when you order.
Buying rebar in Ontario
For almost every project, the practical question is not which mill rolled the bar but who will turn your drawings into correctly cut, bent and tagged bundles on site when you need them.
We are a rebar fabricator in Erin, Ontario. We prepare bar lists and placing drawings from your structural drawings, cut and bend 10M to 55M bar, tag and bundle it by mark and deliver across the GTA and Ontario, with installation available. We also supply GFRP rebar. Send us your drawings for a free take-off and quote, and see our rebar products for what we supply.
Frequently asked questions
Who makes rebar in Canada?
The Canada Border Services Agency's 2026 rebar expiry reviews list five Canadian producers: ArcelorMittal Long Products Canada, Gerdau, AltaSteel, Max Aicher North America and Ivaco Rolling Mills. Most contractors buy their bar through fabricators and suppliers rather than directly from these mills.
Is rebar made in Ontario?
Yes. Max Aicher North America operates in Hamilton, and Gerdau runs a steel mill in Whitby. Ivaco Rolling Mills, a wire rod producer that also makes small quantities of rebar, is another Canadian producer.
Can I buy rebar directly from a steel mill?
Mills sell straight bar in mill lengths and large quantities, mostly to fabricators and distributors. Contractors and homeowners normally buy through a rebar fabricator or a supply yard, which can cut, bend and deliver smaller quantities.
Is Canadian rebar made from recycled steel?
Much of it is. AltaSteel states that its steel is made from 100% recycled material, Gerdau describes its North American steel as made from recycled scrap, and ArcelorMittal Long Products Canada's operations include scrap recycling and electric arc furnaces.
How can I tell which mill made my rebar?
Canadian rebar carries rolled-in markings on the bar that identify the producing mill, the bar size and the grade. The mill test certificate for the heat of steel gives the full details.
