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v3.26.1

Note 33 - Principal subsidiaries - Percentage of Ownership of Each Controlled Company (Details) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership |  | 50.00% |  |
Canada | ALGOMA TUBES INC. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Canada | TENARIS GLOBAL SERVICES (CANADA) INC. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Netherlands | EXIROS B.V. and subsidiaries [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 50.00% | 50.00% | 50.00%
Netherlands | TENARIS CONNECTIONS BV [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Netherlands | TENARIS INVESTMENTS (NL) B.V. and subsidiaries [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Brazil | CONFAB INDUSTRIAL S.A. and subsidiaries [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Italy | DALMINE S.p.A. and subsidiaries [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
USA | HYDRIL COMPANY [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
USA | MAVERICK TUBE CORPORATION and subsidiaries [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
USA | TENARIS BAY CITY, INC. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
USA | TENARIS GLOBAL SERVICES (U.S.A.) CORPORATION [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Indonesia | P.T. SEAMLESS PIPE INDONESIA JAYA [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 89.00% | 89.00% | 89.00%
Romania | SILCOTUB S.A. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Saudi Arabia | SAUDI STEEL PIPE CO. and subsidiaries [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 47.79% | 48.00% | 48.00%
Argentina | OILFIELD SERVICES SOCIEDAD ANONIMA [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Argentina | SIAT SOCIEDAD ANONIMA [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Argentina | SIDERCA SOCIEDAD ANONIMA INDUSTRIAL Y COMERCIAL and subsidiaries [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Portugal | TALTA - TRADING E MARKETING SOCIEDADE UNIPESSOAL LDA. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Uruguay | TENARIS GLOBAL SERVICES S.A. and subsidiaries [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
United Kingdom | TENARIS GLOBAL SERVICES (UK) LTD [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Luxembourg | TENARIS GLOBAL SERVICES and INVESTMENTS S.àr.l. and subsidiaries [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
China | TENARIS QINGDAO STEEL PIPES LTD. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Colombia | TENARIS TUBOCARIBE LTDA. [member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
Mexico | TUBOS DE ACERO DE MEXICO, S.A. and subsidiaries |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Percentage of ownership | [1] | 100.00% | 100.00% | 100.00%
[1] | All percentages rounded.

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- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2025-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2025-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph 19B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_19B_c&doctype=Standard -URIDate 2025-03-27 + Details
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