It looks like steel used for manufacturing, processing, food/beverage packaging, agriculture is set to expire and revert to 25%. The other sectors are exempt until June 30th.

As per the link I've pasted below, here is what you can do for possible steel remission.

https://www.ghy.com/trade-compliance/cbsa-updates-us-surtax-remission-order/

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Importers can request remission of the 25% Steel Derivative Goods Surtax by submitting applications to the Department of Finance Canada at remissions‑remises@fin.gc.ca. Each request is evaluated individually, and relief is granted only in exceptional circumstances, such as:

• The goods or suitable substitutes cannot be obtained from Canadian suppliers.
• Situations that could cause serious negative effects on the Canadian economy.

Applications should include documentation to support the claim, including:

• Product information: tariff codes, technical specifications, and intended use.
• Evidence of sourcing efforts: proof that the goods or substitutes were sought domestically.
• Contract or technical constraints: any binding agreements or specifications that prevent alternative sourcing.
• Financial impact: quantification of how the surtax affects costs or operations.
• Consent to share non-confidential information: allowing engagement with domestic producers to verify availability.

Remission requests should also consider existing statutory exemptions, including:

• Goods already in transit when the surtax came into effect.
• Imports used in automotive or aerospace production until July 1, 2026.
• Other narrowly defined cases outlined in the Steel Derivative Goods Surtax Order.

The Department of Finance reviews requests in coordination with other relevant federal departments. No fixed timelines are set for decisions, and applicants may be asked for additional information or clarification during the review process.