Current issue date: 23 December 2020 Original approval(s): Expiry date: 21 July 2023 OHSAS 18001 – 22 July 2017 Certificate identity number: 10325305 ISO 45001 - 23 December 2020

Certificate of Approval

This is to certify that the Management System of: Tenaris

Societe Anonyme Holding

Dr. Simini 250, B2804MHA Campana - Buenos Aires, Argentina

has been approved by Lloyd's Register to the following standards:

ISO 45001:2018

Approval number(s): ISO 45001 – 0029599

This certificate is valid only in association with the certificate schedule bearing the same number on which the locations applicable to this approval are listed.

The scope of this approval is applicable to:

Sales, Product Design and Development, Manufacture and Service Provision of Steel Bars, Steel Tubular Products and Accessories, gas cylinders, threading, coating and end protectors. Manufacture of sucker rods. Reception, storage and processing of ferrous scrap. Service for Management of Civil Construction, Mechanical and Electrical Services; Assembly of Equipment, Piping and Instrumentation Equipment and Industrial Plant. Activities associated with the production of electric power and steam.

Daniel Oliva Marcilio de Souza Area Operations Manager - South Europe Issued by: Lloyd's Register Quality Assurance Italy Srl for and on behalf of: Lloyd's Register Quality Assurance Limited

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Viale Monza, 265 20126 Milano Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 1 of 9

Certificate identity number: 10325305

Certificate Schedule

Location Activities

Tenaris ISO 45001:2018

Siderca (Siderca S.A.I.C.) Manufacture, of steel round bar seamless hot rolled and cold drawn tubular steel products and accessories. Dr. Simini 250, B2804MHA Campana - Buenos Aires, Argentina Provision of services associated to these products.

ISO 45001 – 0029599-007

Tenaris ISO 45001:2018

Villa Mercedes (Metalmecanica S.A.) Sucker Rods Manufacturing for Oil Industry, Protectors Ruta 55, Km 754,100, (5730) Villa Mercedes - San Luis, and Accessories: Couplings, Nipples, Cemented Pipes and Pony Rods. Argentina

ISO 45001 – 0029599-010

Tenaris ISO 45001:2018

Villa Mercedes (Metalmecanica S.A.) Sucker Rods Manufacturing for Oil Industry and Accessories: Couplings. Ruta 7, km 701, (5730) Villa Mercedes - San Luis, Argentina

ISO 45001 – 0029599-048

Tenaris ISO 45001:2018

Metalmecanica S.A. Manufacturing of Cemented Pipes.

ISO 45001 – 0029599-049

Ruta Prov 24 Km 7,5, (5730) Villa Mercedes,

San Luis, Argentina

Tenaris ISO 45001:2018

Scrap Service S.A. Reception, Storage, Processing and Dispatch of Ferrous Ruta 6, Km 203,436 Campana - Provincia de Buenos Aires, Scrap.

ISO 45001 – 0029599-012

Argentina

Tenaris ISO 45001:2018

Scrap Service S.A. Reception, Storage, Processing and Dispatch of Ferrous Ruta de la Tradición (7424) Esteban Echeverría - Provincia de Scrap.

ISO 45001 – 0029599-013

Buenos Aires, Argentina

Tenaris ISO 45001:2018

Scrap Service S.A. Reception, Storage, Processing and Dispatch of Ferrous Avda. General Savio 4655, (5014) Ciudad de Córdoba - Scrap.

ISO 45001 – 0029599-014

Provincia de Córdoba, Argentina

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Viale Monza, 265 20126 Milano Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 2 of 9

Certificate identity number: 10325305

Certificate Schedule

Location Activities

Tenaris ISO 45001:2018

Scrap Service S.A. Reception, Storage, Processing and Dispatch of Ferrous Ruta 8, Km 18 N° 4846, (1650) San Martín - Provincia de Scrap.

ISO 45001 – 0029599-015

Buenos Aires, Argentina

Tenaris ISO 45001:2018

Confab (Confab Industrial S.A.) Manufacture and service provision of welded carbon and Avenida Gastao Vidigal Neto, 475, (12414-020) Cidade Nova, micro alloyed steel tubes coated and uncoated and structural tubes. Storage and distribution of pipes and Pindamonhangaba - Sao Paulo, Brazil supply services of inspections of pipes.

ISO 45001 – 0029599-016

Tenaris ISO 45001:2018 Confab Sucker Rods (Tenaris Confab Hastes de Bombeio Manufacture and technical support services for steel

S.A.) sucker rods and accessories, polished rods, sucker rods Rua Dr. Gonzaga s/n. (12440-200) Moreira César, guides and sinker bars.

ISO 45001 – 0029599-043

Pindamonhangaba - Sao Paulo, Brazil

Tenaris ISO 45001:2018

Confab Montagens Ltda. Service for Management of Civil Construction, Mechanical Rua Dr. Gonzaga s/n, (12440-9000) Moreira Cesar, and Electrical Services; Assembly of Equipment, Piping and Instrumentation Equipment and Industrial Plant. Pindamonhangaba - SP, Brazil

ISO 45001 – 0029599-044

Tenaris ISO 45001:2018

Confab Industrial S.A. - Negocio Equipamentos Design and Manufacture of Equipment for Petroleum, Rua Dr. Gonzaga s/n, (12440-200) Moreira Cesar, Petrochemical, Pulp and Paper, Power, Metallurgy and Mining such as: Pressure Vessels, Reactors, Process Pindamonhangaba SP, Brazil Towers, Boilers, Heat Exchangers, Evaporators, Fired Heaters, Blast Furnaces and Steel Converter. Management of Assembly Services.

ISO 45001 – 0029599-045

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Viale Monza, 265 20126 Milano Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 3 of 9

Certificate identity number: 10325305

Certificate Schedule

Location Activities

Tenaris ISO 45001:2018

Tamsa (Tubos de Acero de México, S.A.) Manufacture and Service Provision of Steel Bars, Hot Carretera México - Vía Km. 433.7, (91697) Rolled and Cold Drawn, Steel Tubular Products and Accessories, Couplings, Sub-couplings, Protectors, Veracruz, Sucker Rods and Sucker Rods guides.

ISO 45001 – 0029599-017

Tenaris ISO 45001:2018

División Conexiones (Tubos de Acero de México S.A.) Manufacture and sales of seamless butt-weld fittings in Carretera Monterrey-Laredo km. 24.2, (65550) Ciénega de carbon and alloy steel.

ISO 45001 – 0029599-035

Flores, Nuevo Leon, Mexico

Tenaris ISO 45001:2018

Tamsa (Tubos de Acero de México, S.A.) (Coatzintla) Storage yards and field services building.

ISO 45001 – 0029599-036

Carretera Coatzintla-Palma Sola Km 61.100 al 61.400,

Población La Laja, (93160) Coatzintla - Veracruz, Mexico

Tenaris ISO 45001:2018

Tamsa (Tubos de Acero de México, S.A.) (Comalcalco) Storage and sales of seamless steel hot rolled tubular Km 150 Carretera Cárdenas- Comalcalco., Ranchería Oriente, 5 products and accessories.

ISO 45001 – 0029599-037

sección Col. Centro, (86650) Comalcalco, Tabasco, Mexico

Tenaris ISO 45001:2018

TuboCaribe (Tenaris Tubocaribe LTDA) Manufacture of Welded Steel Line Pipe, Casing, Tubing, Parque Industrial Carlos Velez Pombo Km 1 Via Turbaco, Couplings, Pup Joints, Electrical Metallic Tubing and Processing of Tubular Products, Application of Turbaco, Bolívar, Colombia single/Multi-Layer Coatings.

ISO 45001 – 0029599-018

Tenaris ISO 45001:2018

Hickman (Maverick Tube Corporation) Manufacture of welded pipes (OCTG and Line Pipe), and externally coated line pipe. 5010 North County Rd 967, Blytheville, AR,

ISO 45001 – 0029599-019

72315, United States

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Viale Monza, 265 20126 Milano Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 4 of 9

Certificate identity number: 10325305

Certificate Schedule

Location Activities

Tenaris ISO 45001:2018

Downhole Center (Tenaris Coiled Tubes, LLC) Manufacture and Service of Coiled Tubing for the Oil and 8615 East Sam Houston Parkway North, Houston, TX, 77044, Gas Industry.

ISO 45001 – 0029599-022

United States

Tenaris ISO 45001:2018

McCarty (Hydril Company) Threading and Surface Coating of Casing and Tubing Steel Pipes and Accessories. Sales and Storage of 302 McCarty Drive, Houston, TX, 77029, Tubular Product and Accessories. United States

ISO 45001 – 0029599-023

Tenaris ISO 45001:2018

Bakersfield (Hydril Company) Threading of casing and tubing steel pipes and accessories; sales, service provision and storage of 3237 Patton Way, Bakersfield, CA, 93308-5717, tubular products and accessories. United States

ISO 45001 – 0029599-024

Tenaris ISO 45001:2018

Bay City (Tenaris Bay City Inc.) Manufacture and Service provision of hot rolled seamless steel tubular products. 7960 SH 35, Bay City, TX, 77414, United States

ISO 45001 – 0029599-046

Tenaris ISO 45001:2018

Conroe (Maverick Tube Corporation) Manufacture of Welded Line Pipe, Casing and Tubing.

ISO 45001 – 0029599-055

699 FM Road 3083, Conroe, TX, 77301, United States

Tenaris ISO 45001:2018

AlgomaTubes (Algoma Tubes Inc.) Manufacture of Hot Rolled Seamless Steel Pipe including 547 Wallace Terrace, Sault Sainte Marie, Ontario, P6C 1L9, Heat Treatment and Threading of Tubular Products.

ISO 45001 – 0029599-025

Canada

Tenaris ISO 45001:2018

Nisku (Hydril Canadian Company Limited Partnership) Threading of Tubular products and Accessories for the Oil and Gas Industry. 2307 8th Street, Nisku, Alberta, T9E 7Z3,

ISO 45001 – 0029599-026

Canada

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Viale Monza, 265 20126 Milano Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 5 of 9

Certificate identity number: 10325305

Certificate Schedule

Location Activities

Tenaris ISO 45001:2018

Dalmine (Dalmine S.p.A.) Manufacture, sales of seamless steel hot rolled products, bars and accessories, logistic services and power plant P.za Caduti 6 Luglio 1944 n. 1, 24044 Dalmine (Bergamo), generation. Receipt, storage and Recovery of ferrous Italy scrap, temporary storage of industrial hazardous waste.

ISO 45001 – 0029599-001

Tenaris ISO 45001:2018

Sabbio Bergamasco (Dalmine S.p.A.) Design, manufacture and sale of steel gas cylinders and logistic services. Via Levate 2, 24044 Sabbio Bergamasco (Bergamo), Italy

ISO 45001 – 0029599-002

Tenaris ISO 45001:2018

Piombino (Dalmine S.p.A.) Manufacturing of welded steel tubes coated and uncoated and logistic services. Località Ischia di Crociano, 57025 Piombino (Livorno), Italy

ISO 45001 – 0029599-003

Tenaris ISO 45001:2018

Arcore (Dalmine S.p.A.) Manufacturing of hot rolled steel seamless tubes and logistic services. Via A. Grandi 100, 20862 Arcore (Monza e della Brianza), Italy

ISO 45001 – 0029599-004

Tenaris ISO 45001:2018

Costa Volpino (Dalmine S.p.A.) Manufacturing of cold drawn steel tubes and tubular parts and logistic services. Temporary storage of industrial Via Piò 30, 24062 Costa Volpino (Bergamo), hazardous waste. Italy

ISO 45001 – 0029599-005

Tenaris ISO 45001:2018

Dalmine OCTG Accessories Center (Dalmine S.p.A.) Mechanical machining of pipes, manufacture of special parts and logistics services. Via Friuli 7/B, 24044 Dalmine (Bergamo),

ISO 45001 – 0029599-006

Italy

Tenaris ISO 45001:2018

Silcotub (S.C. Silcotub S.A.) Manufacture, sales, storage and service provision of seamless steel hot rolled and cold drawn tubular products 93 Mihai Viteazu Blv, 450131 Zalau - Salaj County, Romania and accessories.

ISO 45001 – 0029599-008

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Viale Monza, 265 20126 Milano Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 6 of 9

Certificate identity number: 10325305

Certificate Schedule

Location Activities

Tenaris ISO 45001:2018

Calarasi (S.C. Silcotub S.A.) Manufacture and sales of continuously cast steel bars, for 162 Prelungirea Bucuresti Road, 910153 Calarasi County, pipes production, profiles and for other steel products.

ISO 45001 – 0029599-039

Romania

Tenaris ISO 45001:2018

Campina Sucker Rods (S.C. Silcotub S.A.) Manufacture, sales, storage and services provision of 1 Orizontului Street, 105600 Campina - Prahova County, seamless steel hot rolled and cold drawn tubular products and accessories. Romania

ISO 45001 – 0029599-040

Tenaris ISO 45001:2018

Ploiesti (S.C. Silcotub S.A.) Storage and sales of seamless steel hot rolled tubular Targoviste Road, Km. 8, 100213 Industrial Park Ploiesti, products, accessories and services provision.

ISO 45001 – 0029599-041

Prahova County, Romania

Tenaris ISO 45001:2018

Popesti (S.C. Silcotub S.A.) Collection and storage of scrap.

ISO 45001 – 0029599-042

91 Soseaua de Centura - Popesti Leordeni Ilfov County,

Romania

Tenaris ISO 45001:2018

Aberdeen (Tenaris Global Services (UK) Limited) Processing and threading of steel tubular products (casing Minto Avenue, Altens Industrial Estate, Aberdeen - Scotland, tubing line pipe and accessories), sales service provision and storage of tubular products and accessories. AB12 3JZ, United Kingdom

ISO 45001 – 0029599-027

Tenaris ISO 45001:2018

Badentoy (Tenaris Global Services (UK) Limited) Service provision and storage of steel tubular products and Badentoy Industrial Estate, Portlethen - Aberdeen, AB12 4YD, accessories.

ISO 45001 – 0029599-057

United Kingdom

Tenaris ISO 45001:2018

SPIJ (PT. Seamless Pipe Indonesia Jaya) Processor and threader of tubular products (casing, Krakatau Industrial Estate Cilegon, Banten Jl. Antartika I Kav. tubing, seamless line pipe) and accessories, service and storage provision of tubular products and accessories. F4, 42436 Cilegon, Indonesia

ISO 45001 – 0029599-029

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Viale Monza, 265 20126 Milano Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 7 of 9

Certificate identity number: 10325305

Certificate Schedule

Location Activities

Tenaris ISO 45001:2018

Batam (PT. Hydril Indonesia) Threading of casing and tubing steel pipes and Kabil Industrial Estae, JI Hang Kesturi 1 Kav 23 & 24, Kabil accessories; sales, service provision and storage of tubular products and accessories. Batam, 29467 Riau Islands, Indonesia

ISO 45001 – 0029599-030

Tenaris ISO 45001:2018

Qingdao (Tenaris Qingdao Steel Pipes Ltd) Processing and threading, sales, technical and integrated No. 2001, Kunlun Shan South Road, Eco & Tech Development Supply Chain management service provision of steel tubular products and accessories. Zone, Qingdao City, P.R. China

ISO 45001 – 0029599-031

Tenaris ISO 45001:2018

Dammam (Tenaris Saudi Arabia Ltd) Processor and threader of tubular products (casing, 2nd Industrial City - PO BOX 12441, Dammam 31473 - Eastern tubing, seamless line pipe) and accessories, service and storage provision of tubular products and accessories. Province, Saudi Arabia

ISO 45001 – 0029599-032

Tenaris ISO 45001:2018

Onne (Tenaris Global Services Nigeria Ltd) Threading, machining and finishing of steel pipes and Oil and Gas Freezone Federal Lighter Terminal - Onne/Port accessories, storage and other services related.

ISO 45001 – 0029599-033

Harcourt - Rivers State, Nigeria

Tenaris ISO 45001:2018

Onne Pipe Coating Center (Pipe Coaters Nigeria Ltd.) Coating of steel pipes and accessories, storage and other Oil and Gas free trade zone Federal Lighter Terminal, Onne/Port services related.

ISO 45001 – 0029599-034

Harcourt - River State, Nigeria

Tenaris ISO 45001:2018

NKKTubes (NKKTUBES) Manufacture of seamless steel hot rolled tubular products.

ISO 45001 – 0029599-051

2-1, Ikegami Kawasaki-ku, Kawasaki 210-0864, Japan

Tenaris ISO 45001:2018

Machachi (Tenaris Ecuador S.A.) Threading of casing and tubing steel pipes, service Panamericana Sur Km 16,2 y camino a San Alfonso, Vía a provision and storage of tubular products and accessories.

ISO 45001 – 0029599-053

Machachi, Pichincha, Ecuador

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Viale Monza, 265 20126 Milano Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 8 of 9

Certificate identity number: 10325305

Certificate Schedule

Location Activities

Tenaris ISO 45001:2018

Tenaris Global Services Ecuador S.A. Reception, Storage, Inspection and Dispatch of Steel Km 7 Via El Proyecto - Shushufindi Parroquia 7 de Julio, Tubes and Accessories.

ISO 45001 – 0029599-054

Sucumbios, Ecuador

Tenaris ISO 45001:2018

Aktau (Kazakhstan Pipe Threaders LLP) Threading of steel tubular products, service provision.

ISO 45001 – 0029599-056

130000, Mangystau Region, Aktau - Industrial Zone, Subzone

#3, Building ABK, Aktau, Kazakhstan

Lloyd's Register Group Limited, its affiliates and subsidiaries, including Lloyd's Register Quality Assurance Limited (LRQA), and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Lloyd's Register'. Lloyd's Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Lloyd's Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract. Issued by: Lloyd's Register Quality Assurance Italy Srl, Viale Monza, 265 20126 Milano Italy for and on behalf of: Lloyd's Register Quality Assurance Limited, 1 Trinity Park, Bickenhill Lane, Birmingham B37 7ES, United Kingdom Page 9 of 9