Cleveland-Cliffs will indefinitely idle cold-rolled and coated operations at Stelco’s Hamilton Works from October 9, cutting as many as 500 jobs. Ottawa is weighing enforcement action under the Investment Canada Act over five-year employment undertakings attached to the 2024 takeover, while the union accuses the company of lobbying for the tariffs it now blames.
HAMILTON, Ontario, October 2, 2026 | Cleveland-Cliffs Inc. will indefinitely idle the cold-rolled and coated steel finishing operations at Stelco’s Hamilton Works beginning on or about October 9, a decision the Ohio-based steelmaker announced on Monday, September 28 and attributed to United States tariffs that have made cross-border shipment uneconomic.
Up to 500 workers across the Hamilton and Nanticoke operations are affected. Roughly 350 unionized employees at Hamilton Works face direct layoff, with approximately 250 coke unit positions remaining at the site. The company has said it will offer relocation opportunities at its Lake Erie Works in Nanticoke, Ontario, although United Steelworkers leadership told reporters that only 46 positions were available there when the layoffs were announced.
Prime Minister Mark Carney said on September 29 that Stelco had “betrayed” its Hamilton workforce and confirmed that Ottawa is examining every legal avenue to enforce binding five-year employment commitments imposed as a condition of approving Cleveland-Cliffs’ acquisition of Stelco in late 2024.
The dispute has become the sharpest domestic flashpoint of the Canada-United States trade conflict to date, not least because it turns on a question of corporate conduct rather than tariff arithmetic.
THE DECISION AND ITS SCOPE
Hamilton Works occupies a particular position in Canadian industrial history and in the modern supply chain. The finishing operations being idled produce cold-rolled and galvanized sheet, the grades that feed automotive stamping, appliance manufacture and construction. These are value-added products rather than commodity hot band, and they had been a principal justification for the plant’s continued operation after upstream iron and steelmaking moved to Lake Erie Works years ago.
Cleveland-Cliffs chief executive Lourenco Goncalves framed the decision in demand terms. He has said the company confronts a “market that has disappeared,” citing a decline of nearly 25 per cent in galvanized steel product demand in the second quarter of 2026 and the 50 per cent United States tariff on Canadian steel that has made exporting from Hamilton uncompetitive. Corporate communications described the move as “unfortunate but necessary” to ensure the company’s survival, noting that tariffs have “shrunk demand for cold-rolled and galvanized products.”
Goncalves has also characterised the idling as a reorganisation rather than a permanent abandonment of the site, and has stated that “no amount of money” from Ottawa would address the underlying demand shortfall. The distinction matters for the legal analysis that follows, since an indefinite idling and a closure are treated differently under both labour law and investment review undertakings.
Markets took the announcement poorly. Cleveland-Cliffs shares fell approximately 9 per cent on United States exchanges following the news, a steeper decline than that experienced by domestic peers Nucor and Steel Dynamics on the same session.
THE TARIFF BACKDROP
The measures that Cleveland-Cliffs cites have accumulated over 19 months. The United States imposed 25 per cent tariffs on Canadian steel in March 2025 under Section 232 national security authority. That rate was doubled to 50 per cent in June, and the Section 338 programme introduced in August 2026 added a further layer that, for certain metal products, stacks on top of the Section 232 duty to produce combined additional rates approaching 75 per cent.
Canada shipped approximately US$13 billion of steel to the United States in 2024, more than any other country. That position reflected decades of integration in which Canadian mills served American automotive and construction customers as effectively domestic suppliers, with CUSMA preference and short logistics chains making the border economically close to invisible.
That integration is now the sector’s principal vulnerability. Catherine Cobden, chief executive of the Canadian Steel Producers Association, has said the industry has “significantly dropped shipments and have experienced close to 1,000 job losses to date” and is bracing for thousands more.
The Stelco announcement follows roughly 1,000 layoffs at Algoma Steel in Sault Ste. Marie, Ontario. United Steelworkers national director Marty Warren has warned that “the industry is at risk without change.”
Against that backdrop, Washington announced a US$15 billion mega mill project in Iowa, a signal that investment is being concentrated inside the United States rather than across the integrated North American footprint that CUSMA was designed to support.
THE INVESTMENT CANADA ACT QUESTION
The legal confrontation turns on undertakings attached to Ottawa’s approval of Cleveland-Cliffs’ C$3.4 billion acquisition of Stelco, which closed in November 2024 after review under the Investment Canada Act.
Those undertakings, agreed as a condition of the net benefit determination, included commitments to maintain employment levels for five years and to make C$60 million in capital investments. The full text of the undertakings agreement is not public, which legal observers note makes an external assessment of breach difficult.
The statutory machinery is straightforward in outline. Section 39 of the Investment Canada Act permits the minister to issue a demand that an investor either comply with an undertaking or justify its failure to do so. Section 40 permits an application to the Federal Court if the investor does not satisfy that demand, with remedies available including court-ordered compliance and, in principle, divestiture.
The United Steelworkers has requested an emergency compliance review from Industry Minister Mélanie Joly, arguing that the layoffs breach the employment commitments. The union’s framing has been pointed. It argues that Cleveland-Cliffs “should not champion those tariffs in the United States and then invoke the resulting trade disruption while reducing employment in Canada,” a reference to Goncalves’ well-documented public advocacy for aggressive American steel protection.
Cleveland-Cliffs’ defence rests on the proposition that unimpeded access to the United States market was an underlying condition of the transaction. Goncalves told CBC that the company would not have completed the acquisition had trade relations deteriorated to their present state, and maintains that the company retains legal authority to adjust operations in response to market conditions. The company’s position is that market access, not capital availability, is the binding constraint.
There is precedent, and it is instructive. In 2009, U.S. Steel, then the owner of the Hamilton and Lake Erie operations, cut production following the financial crisis. Ottawa issued a Section 39 demand letter and commenced proceedings. The matter was resolved by negotiated settlement in 2011 rather than by judgment, with the company agreeing to production and employment commitments and a capital spending package. The episode demonstrated that Investment Canada Act undertakings carry genuine enforcement weight, while also illustrating that governments generally prefer a settlement to the delay and uncertainty of litigation.
OTTAWA’S POSITION
Carney’s language on September 29 was unusually direct for a sitting prime minister discussing a specific corporate decision. His use of the word “betrayed” signals that the government intends to treat the matter as a test of whether investment review undertakings mean anything when the investor is a politically connected American firm operating in a tariff environment its own chief executive helped create.
The government has said it will pursue all available legal channels to enforce the five-year commitments. Whether that produces a Section 39 demand, a negotiated package of investment and employment guarantees, or a protracted Federal Court proceeding will likely be determined in the coming weeks.
The political dimension is unavoidable. Hamilton is a steel town with a long memory of the U.S. Steel episode, and the perception that a foreign owner extracted value and then withdrew when conditions turned carries substantial weight in Ontario’s industrial heartland. A government that has staked considerable credibility on standing firm against American pressure can ill afford to appear passive on a file where it holds statutory authority.
THE POLICY RESPONSE TO DATE
Ottawa’s sector-specific measures have drawn criticism from the industry they were designed to protect.
In late 2025 the government announced measures intended to protect and transform the steel and lumber industries, and has since introduced a tariff-rate quota applying a 50 per cent surtax on steel imports from countries without a free trade agreement with Canada where volumes exceed 2.6 million metric tons, a threshold set against the prior year’s baseline. A finance ministry spokesperson described the measures as “temporary and calibrated” and said they could be expanded depending on the outcome of ongoing discussions.
Both the Canadian Steel Producers Association and the United Steelworkers have called the quota inadequate. The union objected specifically that the quota “doesn’t apply to two-thirds of imports to Canada, including from countries such as South Korea and Vietnam,” leaving the domestic market exposed to diverted volume at the same moment that export channels are closing.
Ottawa has signalled additional measures, including a reassessment of steel product origin based on where metal was melted and poured. That melt-and-pour standard, already used in the United States, is designed to prevent transhipment and minor processing from conferring origin, and would close a channel through which non-North American steel has entered the Canadian market with nominal transformation.
Ontario has supplemented federal action with provincial liquidity. The province’s $1 billion Protect Ontario Financing Program covers steel, aluminum, copper and automotive businesses, with funds available for payroll, lease payments, utilities and operating expenses. A $150 million Ontario Together Trade Fund supports small and medium-sized firms seeking to expand interprovincial sales or restructure supply chains away from the United States.
Reporting indicates that Stelco did not draw on Ontario or federal tariff aid before announcing the cuts, a detail that has sharpened the union’s argument that the company’s decision was strategic rather than forced.
STAKEHOLDER REACTION
The reaction in Hamilton has been bleak. Workers at Hamilton and Nanticoke described the announcement to CBC as “devastating,” with the limited number of Nanticoke transfer positions offering cold comfort to a workforce whose average tenure measures in decades.
The United Steelworkers has pursued a two-track response, seeking the ministerial compliance review while publicly contesting the company’s rationale. The union has called the tariff explanation “disingenuous and contradictory,” pointing to Goncalves’ advocacy for the measures and to the company’s continued United States operations.
Industry voices have focused on the structural question. Cobden’s warning of thousands of additional job losses reflects a view that the current tariff configuration is not survivable for Canadian producers who built their operations around American demand. Warren’s assessment that the industry is at risk without change points in the same direction.
On the American side, Trump trade adviser Peter Navarro delivered what CTV News characterised as a harsh message to Canadian lobbyists on September 29, telling them to “get the hell out of our country.” Carney responded that he would “take note” of the remarks and offered “no response” beyond that, a studied dismissal that nonetheless registered the deterioration in tone.
ECONOMIC IMPACT ANALYSIS
The direct employment effect of the Stelco decision is measurable: up to 500 positions, concentrated in two Ontario communities. The indirect effect is larger and harder to quantify.
Integrated steel operations anchor dense local supplier networks encompassing maintenance contractors, logistics providers, refractory suppliers, industrial gas distributors and engineering firms. Standard multipliers for primary metals employment in Canada run between two and three indirect positions per direct job, which would place the total employment exposure in the range of 1,000 to 1,500 for the Stelco announcement alone.
Cumulatively, the sector has now shed close to 1,000 positions prior to this announcement, with Algoma’s Sault Ste. Marie cuts accounting for the bulk. Adding Stelco brings the direct total to roughly 1,500, against a Canadian steel workforce that numbers in the low tens of thousands.
The fiscal consequence falls disproportionately on municipalities. Hamilton and Haldimand County derive meaningful industrial assessment from these operations, and an indefinite idling raises questions about assessment appeals and property tax revenue that will surface in 2027 budget cycles.
For downstream Canadian manufacturers, the loss of domestic cold-rolled and coated capacity is a supply question rather than a demand one. Canadian appliance, automotive parts and construction product manufacturers who sourced from Hamilton will need alternative supply, likely from Lake Erie Works, from ArcelorMittal Dofasco, or from offshore. Offshore sourcing raises its own exposure given the pending melt-and-pour origin changes and the tariff-rate quota.
IMPLICATIONS FOR IMPORTERS AND EXPORTERS
Canadian steel exporters should assume that the 50 per cent Section 232 rate, potentially stacked with Section 338 duties, persists through the CUSMA joint review process. Planning assumptions built on near-term relief are not supported by the current posture of either government.
Downstream manufacturers purchasing Canadian steel need to review supply agreements for the consequences of a mill idling. Allocation clauses, substitution rights and quality qualification timelines all become live issues when a qualified source exits. Requalifying a new mill for automotive-grade coated product is a process measured in months, not weeks.
Importers bringing offshore steel into Canada should be tracking the melt-and-pour origin proposal closely. A change to that standard would alter the origin analysis for material that currently enters on the basis of processing location, and would interact with the tariff-rate quota thresholds in ways that could produce sudden duty exposure on goods already contracted.
Canadian businesses with foreign ownership should note the Investment Canada Act dimension of this dispute. Ottawa’s willingness to pursue enforcement of net benefit undertakings has been demonstrated, and acquirers negotiating undertakings in the current environment should expect more demanding commitments and closer monitoring.
For firms across sectors, the broader lesson concerns concentration. The Canadian steel industry’s exposure to a single export market was understood as an efficiency under CUSMA. It is now understood as a risk. Companies with similar profiles in aluminum, forest products, agri-food and machinery should be conducting the diversification analysis now rather than after a proclamation lands.
WHAT COMES NEXT
Three questions will shape the file over the next month.
Whether Minister Joly issues a Section 39 demand to Cleveland-Cliffs will indicate how far Ottawa intends to push the enforcement route. A demand would escalate the matter formally and start a clock; its absence would suggest the government prefers a negotiated outcome.
Whether the October 9 idling proceeds as announced, or is deferred pending discussions, will indicate whether the company views the political cost as material.
And whether Ottawa’s promised additional steel measures, including the melt-and-pour origin change, arrive with sufficient scope to satisfy an industry that has already rejected the first tranche as inadequate will determine whether the domestic market offers any offset to lost export volume.
Hamilton has been here before. The 2009 confrontation ended in a settlement that preserved jobs for a period and then did not. Whether 2026 ends differently depends on choices that will be made in Ottawa, in Cleveland, and in a courtroom neither party has yet entered.
THE WIDER STEEL PICTURE
Stelco’s Hamilton decision is the most visible event in a sector-wide contraction that has been building since the spring.
Canadian primary steel capacity is concentrated in a small number of integrated and electric arc operations: ArcelorMittal Dofasco in Hamilton, Algoma Steel in Sault Ste. Marie, Stelco’s Lake Erie Works in Nanticoke, Gerdau’s Ontario long products operations, and a handful of specialty producers in Quebec and the West. Each has a distinct exposure profile, and each has been affected differently by the 50 per cent United States tariff.
Producers of flat-rolled sheet for automotive and appliance customers carry the heaviest exposure, because that demand sits overwhelmingly on the American side of the border and because the product is not readily redirected. Long products serving Canadian construction have more domestic offset, though they face import competition that the tariff-rate quota was designed to address and that industry says it addresses inadequately.
The sector’s difficulty is that both ends of the equation moved at once. Export channels closed as American tariffs rose, while import pressure into Canada increased as global producers displaced from the American market sought alternative destinations. A Canadian mill facing a 50 per cent wall to the south and diverted offshore tonnage at home has no obvious commercial response.
Capacity utilisation across the sector has fallen materially, and utilisation is the variable that determines whether an integrated operation is viable. Blast furnace economics depend on sustained high throughput; below a certain level, fixed cost absorption fails and idling becomes the rational choice regardless of the operator’s intentions.
THE AUTOMOTIVE LINKAGE
The cold-rolled and coated products being idled at Hamilton Works feed automotive stamping operations on both sides of the border. That linkage matters for understanding the second-order consequences.
North American automotive supply chains were built on the assumption of frictionless steel movement. A coil produced in Hamilton could be stamped in Michigan and installed in a vehicle assembled in Ontario without meaningful tariff consequence. Section 232 duties at 25 per cent strained that model. At 50 per cent, with Section 338 stacking available, it does not function.
Automotive parts manufacturers in Ontario now face a choice between Canadian steel at domestic prices for Canadian-assembled vehicles, and American or offshore steel for American-assembled programmes. That bifurcation adds inventory, qualification and administrative cost to an industry that operates on thin margins and just-in-time logistics.
Over time, the rational response for a parts manufacturer serving American assembly plants is to locate production in the United States. That is the outcome Canadian industrial policy is attempting to prevent, and the Stelco decision illustrates how difficult prevention becomes once the underlying cost structure has shifted.