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Note 32 - Principal Subsidiaries | 12 Months Ended
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Dec. 31, 2019
Statement Line Items [Line Items] |
Disclosure of interests in subsidiaries [text block] |
| 32 | Principal subsidiaries
The following is a list of Tenaris’s principal subsidiaries and its direct and indirect percentage of ownership of each controlled company at December 31, 2019.
Company | Country of Incorporation | Main activity | Percentage of ownership at December 31, (*)
|  |  | 2019 | 2018 | 2017
ALGOMA TUBES INC. | Canada | Manufacturing of seamless steel pipes | 100% | 100% | 100%
CONFAB INDUSTRIAL S.A. and subsidiaries | Brazil | Manufacturing of welded steel pipes and capital goods | 100% | 100% | 100%
DALMINE S.p.A. | Italy | Manufacturing of seamless steel pipes | 100% | 100% | 100%
HYDRIL COMPANY and subsidiaries (except detailed) (a) | USA | Manufacture and marketing of premium connections | 100% | 100% | 100%
KAZAKHSTAN PIPE THREADERS LIMITED LIABILITY PARTNERSHIP | Kazakhstan | Threading of premium products | 100% | 100% | 100%
MAVERICK TUBE CORPORATION and subsidiaries | USA | Manufacturing of welded steel pipes | 100% | 100% | 100%
NKKTUBES | Japan | Manufacturing of seamless steel pipes | 51% | 51% | 51%
P.T. SEAMLESS PIPE INDONESIA JAYA | Indonesia | Manufacturing of seamless steel products | 89% | 89% | 89%
PRUDENTIAL STEEL LTD. | Canada | Manufacturing of welded steel pipes | 100% | 100% | 100%
S.C. SILCOTUB S.A. | Romania | Manufacturing of seamless steel pipes | 100% | 100% | 100%
SAUDI STEEL PIPE CO. | Saudi Arabia | Manufacturing of welded steel pipes | 48% | NA | NA
SIAT SOCIEDAD ANONIMA | Argentina | Manufacturing of welded and seamless steel pipes | 100% | 100% | 100%
SIDERCA SOCIEDAD ANONIMA INDUSTRIAL Y COMERCIAL and subsidiaries | Argentina | Manufacturing of seamless steel pipes | 100% | 100% | 100%
TALTA - TRADING E MARKETING SOCIEDADE UNIPESSOAL LDA. | Portugal | Holding Company | 100% | 100% | 100%
TENARIS BAY CITY, INC. | USA | Manufacturing of seamless steel pipes | 100% | 100% | 100%
TENARIS CONNECTIONS BV | Netherlands | Development, management and licensing of intellectual property | 100% | 100% | 100%
TENARIS FINANCIAL SERVICES S.A. | Uruguay | Financial company | 100% | 100% | 100%
TENARIS GLOBAL SERVICES (CANADA) INC. | Canada | Marketing of steel products | 100% | 100% | 100%
TENARIS GLOBAL SERVICES (U.S.A.) CORPORATION | USA | Marketing of steel products | 100% | 100% | 100%
TENARIS GLOBAL SERVICES (UK) LTD | United Kingdom | Holding company and marketing of steel products | 100% | 100% | 100%
TENARIS GLOBAL SERVICES S.A. and subsidiaries (except detailed) (b) | Uruguay | Holding company and marketing of steel products | 100% | 100% | 100%
TENARIS INVESTMENTS (NL) B.V. | Netherlands | Holding company | 100% | NA | NA
TENARIS INVESTMENTS S.àr.l. | Luxembourg | Holding company | 100% | 100% | 100%
TENARIS INVESTMENTS SWITZERLAND AG and subsidiaries | Switzerland | Holding company | 100% | 100% | 100%
TENARIS TUBOCARIBE LTDA. | Colombia | Manufacturing of welded and seamless steel pipes | 100% | 100% | 100%
TUBOS DE ACERO DE MEXICO, S.A. | Mexico | Manufacturing of seamless steel pipes | 100% | 100% | 100%
(*) All percentages rounded. (a) Tenaris Investments S.à.r.l. holds 100% of Hydril's subsidiaries shares except for Technical Drilling & Production Services Nigeria. Ltd where it holds 80%. (b) Tenaris Investments S.à.r.l holds 97,5% of Tenaris Supply Chain S.A. and 40% of Tubular Technical Services Ltd. and Pipe Coaters Nigeria Ltd., 49% of Amaja Tubular Services Limited, 49% Tubular Services Angola Lda.

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- Definition The disclosure of interests in subsidiaries. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 2 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_2_b_i&doctype=Standard -URIDate 2019-03-27 + Details
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