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Note 30 - Principal Subsidiaries - Percentage of Ownership of Each Controlled Company (Details)

12 Months Ended

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

HYDRIL COMPANY and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

100.00%

CANADA | ALGOMA TUBES INC. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

CANADA | PRUDENTIAL STEEL LTD. [member]

Statement Line Items [Line Items]

Percentage of ownership

100.00%

100.00%

100.00%

CANADA | TENARIS GLOBAL SERVICES (CANADA) INC. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

BRAZIL | CONFAB INDUSTRIAL S.A. and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

ITALY | DALMINE S.p.A. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

99.00%

UNITED STATES | HYDRIL COMPANY and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1],[2]

100.00%

100.00%

100.00%

UNITED STATES | MAVERICK TUBE CORPORATION and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

UNITED STATES | TENARIS BAY CITY, INC. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

UNITED STATES | TENARIS GLOBAL SERVICES (U.S.A.) CORPORATION [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

JAPAN | NKKTUBES [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

51.00%

51.00%

51.00%

INDONESIA | PT SEAMLESS PIPE INDONESIA JAYA [member]

Statement Line Items [Line Items]

Percentage of ownership

89.00%

77.00%

77.00%

ROMANIA | S.C. SILCOTUB S.A. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

ARGENTINA | SIAT SOCIEDAD ANONIMA [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

ARGENTINA | SIDERCA S.A.I.C. and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

100.00%

100.00%

100.00%

PORTUGAL | TALTA—TRADING E MARKETING SOCIEDADE UNIPESSOAL LDA. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

URUGUAY | TENARIS FINANCIAL SERVICES S.A. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

URUGUAY | TENARIS GLOBAL SERVICES S.A. and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1],[3]

100.00%

100.00%

100.00%

UNITED KINGDOM | TENARIS GLOBAL SERVICES (UK) LTD [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

LUXEMBOURG | TENARIS INVESTMENTS S.àr.l. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

SWITZERLAND | TENARIS INVESTMENTS SWITZERLAND AG and subsidiaries [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

NETHERLANDS | TENARIS CONNECTIONS BV [member]

Statement Line Items [Line Items]

Percentage of ownership

100.00%

100.00%

100.00%

COLOMBIA | TENARIS TUBOCARIBE LTDA. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

MEXICO | TUBOS DE ACERO DE MEXICO S.A. [member]

Statement Line Items [Line Items]

Percentage of ownership

^[1]

100.00%

100.00%

100.00%

[1]	All percentages rounded.
[2]	Tenaris Investments S.a.r.l. holds 100% of Hydril's subsidiaries shares except for Technical Drilling & Production Services Nigeria. Ltd where it holds 80% for 2017, 2016 and 2015.
[3]	Tenaris holds 97,5% of Tenaris Supply Chain S.A, 60% of Gepnaris S.A. and 40% of Tubular Technical Services and Pipe Coaters, and 49% of Amaja Tubular Services Limited.

X

- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2017-03-09

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